Organic light-emitting panel, manufacturing method thereof, and organic display device
19 claims: 2 independent, 17 dependent
- 1複数の画素部が配列されてなる有機発光パネルであって、 前記複数の画素部の各画素部は、互いに発光色が異なり、順に配列された複数の発光部を有し、 各発光部は、第1電極を含む下地層と、前記下地層に対向して設けられ、発光色ごとに対応した有機発光材料を含むインクが塗布されて形成された有機発光層と、前記有機発光層に対して前記下地層と反対側に形成された第2電極とを含み、 同一画素部内における前記複数の発光部は、一方側から他方側に向け、各発光色に対応する前記インクが順番に塗布され、前記有機発光層が形成されてなり、一方側に位置し,対応するインクが第1巡目に塗布される第1発光部と、中央側に位置し,対応するインクが第2巡目に塗布される第2発光部と、他方側に位置し,対応するインクが第3巡目に塗布される第3発光部とを少なくとも有し、 前記下地層の上方には、前記複数の発光部のうちの隣り合う発光部を区画し、各発光部を規定する複数の隔壁が設けられ、 前記複数の画素部は、 前記第1発光部を規定する隣り合う2つの隔壁における対向する面部の傾斜角度が等しく、 前記第2発光部を規定する隣り合う2つの隔壁における対向する面部の傾斜角度が異なり、かつ、前記第3発光部側に位置する隔壁の面部の傾斜角度が、前記第1発光部側に位置する隔壁の面部の傾斜角度よりも大きい、 画素部を含む ことを特徴とする有機発光パネル。
- 2前記複数の画素部は、連続して隣り合うように形成されており、 前記第3発光部を規定する隣り合う2つの隔壁における対向する面部の傾斜角度が等しい、 請求項1記載の有機発光パネル。
- 3前記第2発光部を規定する隣り合う2つの隔壁における、前記第1発光部側に位置する隔壁の対向する面部の傾斜角度は、前記第1発光部を規定する隣り合う2つの隔壁における対向する面部の傾斜角度と等しい、 請求項2記載の有機発光パネル。
- 4前記第2発光部を規定する隣り合う2つの隔壁における、前記第1発光部側に位置する隔壁の対向する面部の傾斜角度は、前記第3発光部を規定する隣り合う2つの隔壁における対向する面部の傾斜角度と等しい、 請求項3記載の有機発光パネル。
- 5前記第2発光部を規定する隣り合う2つの隔壁における、前記第3発光部側に位置する隔壁の対向する面部の傾斜角度は、35度以上45度以下であり、 前記第2発光部を規定する隣り合う2つの隔壁における、前記第1発光部側に位置する隔壁の対向する面部の傾斜角度は、25度以上35度以下であり、 前記第1発光部を規定する隣り合う2つの隔壁における対向する面部の傾斜角度は、25度以上35度以下であり、 前記第3発光部を規定する隣り合う2つの隔壁における対向する面部の傾斜角度は、25度以上35度以下である、 ことを特徴とする請求項4記載の有機発光パネル。
- 6前記複数の画素部の隣り合う画素部の各間には、非画素部が形成され、 前記画素部と前記非画素部との間には、画素部と非画素部を区画する隔壁が形成されており、 各画素部では、 前記第3発光部を規定する隣り合う2つの隔壁における対向する面部の傾斜角度が異なり、前記非画素部側に位置する隔壁の面部の傾斜角度が、前記第2発光部側に位置する隔壁の面部の傾斜角度よりも大きい、 請求項1記載の有機発光パネル。
- 7前記非画素部は、前記有機発光層を含むことなく、前記第2電極と、前記第1電極と同じ材料を以って構成された第3電極とを含み、前記第2電極と前記第3電極とが電気的に接続される、 請求項6記載の有機発光パネル。
- 8前記第2発光部を規定する隣り合う2つの隔壁における、前記第3発光部側に位置する隔壁の対向する面部の傾斜角度が、前記第1発光部側に位置する隔壁の対向する面部の傾斜角度よりも大きく、 前記第3発光部を規定する隣り合う2つの隔壁における、前記非画素部側に位置する隔壁の対向する面部の傾斜角度が、前記第2発光部側に位置する隔壁の対向する面部の傾斜角度よりも大きい、 請求項6記載の有機発光パネル。
- 9前記第2発光部を規定する隣り合う2つの隔壁における、前記第3発光部側に位置する隔壁の対向する面部の傾斜角度と、 前記第3発光部を規定する隣り合う2つの隔壁における、前記非画素部側に位置する隔壁の対向する面部の傾斜角度とが等しい、 請求項8記載の有機発光パネル。
- 10前記第2発光部を規定する隣り合う2つの隔壁における、前記第1発光部側に位置する隔壁の対向する面部の傾斜角度は、前記第1発光部を規定する隣り合う2つの隔壁における対向する面部の傾斜角度と等しい、 請求項6記載の有機発光パネル。
- 11前記第3発光部を規定する隣り合う2つの隔壁における、前記第2発光部側に位置する隔壁の対向する面部の傾斜角度は、前記第1発光部を規定する隣り合う2つの隔壁における対向する面部の傾斜角度と等しい、 請求項10記載の有機発光パネル。
- 12前記第2発光部を規定する隣り合う2つの隔壁における、前記第3発光部側に位置する隔壁の対向する面部の傾斜角度は、35度以上45度以下であり、 前記第3発光部を規定する隣り合う2つの隔壁における、前記非画素部側に位置する隔壁の対向する面部の傾斜角度は、35度以上45度以下であり、 前記第2発光部を規定する隣り合う2つの隔壁における、前記第1発光部側に位置する隔壁の対向する面部の傾斜角度は、25度以上35度以下であり、 前記第3発光部を規定する隣り合う2つの隔壁における、前記第2発光部側に位置する隔壁の対向する面部の傾斜角度は、25度以上35度以下であり、 前記第1発光部を規定する隣り合う2つの隔壁における対向する面部の傾斜角度は、25度以上35度以下である、 請求項11記載の有機発光パネル。
- 13前記傾斜角度は、前記隔壁における前記対向する各面部と、前記隔壁が形成されている前記下地層の上面とがなす角度である、 請求項1記載の有機発光パネル。
- 14請求項1から請求項13の何れかに記載の有機発光パネルを備えた有機表示装置。
- 15複数の画素部が配列されてなる有機発光パネルの製造方法であって、 基板上に、第1電極を含む下地層を形成する第1工程と、 前記下地層の上に、感光性レジスト材料を積層する第2工程と、 前記積層された感光性レジスト材料をマスク露光してパターニングすることにより、各画素部ごとに複数の発光部に対応する複数の開口を形成するとともに、隣接する前記発光部を区画して各発光部を規定する複数の隔壁を形成する第3工程と、 前記複数の開口のそれぞれに対して、有機発光材料を含むインクを滴下して乾燥させ、有機発光層を形成する第4工程と、 前記有機発光層の上方に、第2電極を形成する第5工程と、 を有し、 前記第3工程では、 各画素部ごとに、一方側に位置する第1発光部に対応する第1開口と、中央側に位置する第2発光部に対応する第2開口と、他方側に位置する第3発光部に対応する第3開口とを形成し、 さらに、 前記第1発光部を規定する隣り合う2つの隔壁における対向する面部の傾斜角度を等しく形成するとともに、 前記第2発光部および前記第3発光部のうち、少なくとも前記第2発光部を規定する隣り合う2つの隔壁における対向する面部の傾斜角度を異ならせ、且つ、前記第3発光部側に位置する隔壁の面部の傾斜角度を前記第1発光部側に位置する隔壁の面部の傾斜角度よりも大きくなるように形成し、 前記第4工程では、 各画素部ごとに、各発光色に対応する前記インクを、前記第1開口、前記第2開口、前記第3開口の順番に滴下し、前記有機発光層を形成する、 ことを特徴とする有機発光パネルの製造方法。
- 16前記第3工程では、 前記感光性レジスト材料の露光に関し、前記第2発光部を規定する隣り合う2つの隔壁における、前記第3発光部側に位置する隔壁の面部に相当する部分への露光量を、前記第1発光部側に位置する隔壁の面部に相当する部分への露光量よりも大きくすることにより、 前記第2発光部を規定する隣り合う2つの隔壁における、前記第3発光部側に位置する隔壁の面部の傾斜角度を、前記第1発光部側に位置する隔壁の面部の傾斜角度よりも大きくする、 請求項15記載の有機発光パネルの製造方法。
- 17前記第3工程では、 前記感光性レジスト材料の露光に関し、前記第2発光部を規定する隣り合う2つの隔壁における、前記第3発光部側に位置する隔壁の面部に相当する部分への光の透過率が、前記第1発光部側に位置する隔壁の面部に相当する部分への光の透過率よりも大きくなるように、それぞれの面部に相当する部分に対して互いに異なるマスクを用いることにより、 前記第2発光部を規定する隣り合う2つの隔壁における、前記第3発光部側に位置する隔壁の面部の傾斜角度を、前記第1発光部側に位置する隔壁の面部の傾斜角度よりも大きくする、 請求項15記載の有機発光パネルの製造方法。
- 18前記第3工程では、 前記感光性レジスト材料を露光して現像した後、前記第2発光部を規定する隣り合う2つの隔壁における、前記第3発光部側に位置する隔壁の面部に相当する部分に対し、露光処理を追加して行うことにより、 前記第2発光部を規定する隣り合う2つの隔壁における、前記第3発光部側に位置する隔壁の面部の傾斜角度を、前記第1発光部側に位置する隔壁の面部の傾斜角度よりも大きくする、 請求項15記載の有機発光パネルの製造方法。
- 19請求項15から請求項18の何れかに記載の製造方法により得られた有機発光パネルを備えた有機表示装置。
Independent claims19
191 paragraphs, as filed
The present invention relates to an organic light emitting panel, a method for producing the same, and an organic display device.
In recent years, research and development of display devices utilizing the electroluminescence phenomenon of organic materials have been promoted. In this display device, each pixel portion has an anode electrode and a cathode electrode, and an organic light emitting layer interposed between them. Then, in driving the display device, holes are injected from the anode electrode, electrons are injected from the cathode electrode, and the holes and electrons are recombined in the organic light emitting layer to emit light.
The organic light emitting layers of the adjacent pixel portions are partitioned by a partition wall (bank) made of an insulating material. The formation of the organic light emitting layer is performed, for example, by dropping an ink containing an organic light emitting material in each region partitioned by a partition wall and drying the ink.
By the way, there is a problem that it is difficult to make the film thickness of the organic light emitting layer formed as described above uniform.
Here, in order to make the film thickness of the organic light emitting layer uniform, for example, Patent Document 1 describes a technique of providing a convex portion on the surface portion of the partition wall and thereby controlling the pinning position of the ink with respect to the surface portion of the partition wall. ing. That is, by adopting the technique proposed in Patent Document 1, the pinning position when the ink is dropped in one pixel portion can be pinned to the convex portion formed on the surface portion, thereby to some extent. The film thickness uniformity can be ensured.
<p><patcit num="1"><text>Japanese Unexamined Patent Publication No. 2007-31235</text></patcit></p>
<p num="0007"> By the way, for the organic light emitting panel in the display device, the technique proposed in Patent Document 1 is adopted, the unevenness of the film thickness of the organic light emitting layer is grasped in advance, and based on this, each region or each corresponding surface portion of the partition wall is used. It is considered difficult to form a fine convex portion with high accuracy. Therefore, it is not easy to make the film thickness of the organic light emitting layer uniform in the entire region of the organic light emitting panel.</p><p num="0008"> The present invention has been made to solve the above problems, and provides a display device having less uneven brightness in the plane and a method for manufacturing the same, in order to make the film thickness of the organic light emitting layer uniform on the entire surface of the panel. The purpose is.</p>
<p num="0009"> Therefore, the organic light emitting panel according to one aspect of the present invention is characterized by adopting the following configuration.</p><p num="0010"> The organic light emitting panel according to one aspect of the present invention is an organic light emitting panel in which a plurality of pixel portions are arranged, and each pixel portion of the plurality of pixel portions has a different emission color from each other and is arranged in order. It has a light emitting part. Each light emitting portion has an organic light emitting layer including a first electrode, an organic light emitting layer provided facing the base layer and formed by applying an ink containing an organic light emitting material corresponding to each light emitting color, and an organic light emitting layer. It includes a second electrode formed on the opposite side of the base layer.</p><p num="0011"> Further, in the organic light emitting panel according to one aspect of the present invention, a plurality of light emitting parts in the same pixel part are sequentially coated with ink corresponding to each light emitting color from one side to the other side, thereby forming an organic light emitting layer. Is formed, and is located on one side and the corresponding ink is applied to the first round, and the second light emitting part is located on the center side and the corresponding ink is applied to the second round. It has at least a light emitting part and a third light emitting part located on the other side and to which the corresponding ink is applied in the third round, and above the base layer, adjacent to each other among the plurality of light emitting parts. A plurality of partition walls are provided which partition the light emitting part and define each light emitting part. Then, in the organic light emitting panel according to one aspect of the present invention, the inclination angles of the facing surface portions of the two adjacent partition walls that define the first light emitting portion are equal among the plurality of pixel portions, and the second light emitting portion is defined. The inclination angles of the facing surfaces of the two adjacent partition walls are different, and the inclination angle of the surface portion of the partition wall located on the third light emitting portion side is larger than the inclination angle of the surface portion of the partition wall located on the first light emitting portion side. It is characterized by including a pixel portion that satisfies the relationship of being large.</p>
<p num="0012"> In the organic light emitting panel according to one aspect of the present invention, since the corresponding ink is applied to the first light emitting portion in the first round to form the organic light emitting layer, the first light emitting portion is formed when the first light emitting portion is formed. In the region adjacent to the light emitting portion, the ink is not applied, the ink vapor concentration is equal to "0" on one end side and the other end side of the first light emitting portion, and the film thickness of the organic light emitting layer is biased. There is no. Therefore, by making the inclination angles of the facing surfaces of the adjacent partition walls equal to each other for the first light emitting portion, it is possible to prevent the film thickness from being biased and obtain good light emitting characteristics.</p><p num="0013"> On the other hand, in the second light emitting portion, the corresponding ink is applied in the second round to form the organic light emitting layer. Therefore, when the second light emitting portion is formed, the ink is formed in the region adjacent to the second light emitting portion. The vapor concentration will be different. That is, in the second light emitting portion, the vapor concentration of the ink is higher on one end side, which is the first light emitting portion side, than on the other end side, which is the third light emitting portion side. Therefore, in the second light emitting portion, the film thickness of the light emitting layer on the other end side of the organic light emitting portion on the third light emitting portion side is larger than the film thickness of the light emitting layer on the one end side on the first light emitting portion side. Therefore, the film thickness tends to be biased.</p><p num="0014"> However, according to the above configuration according to one aspect of the present invention, the inclination angle of the surface portion of the partition wall located on the third light emitting portion side of the facing surface portions of the two adjacent partition walls defining the second light emitting portion is the first. Since the angle of inclination of the surface of the partition wall located on the light emitting portion side is larger, the pinning position of the ink on the partition wall located on the third light emitting portion side is relative to the pinning position of the ink on the partition wall located on the first light emitting portion side. Higher. As a result, the film thickness of the organic light emitting layer on the third light emitting portion side can be suppressed, and unevenness in the film thickness at one end and the other end of the second light emitting portion can be prevented.</p><p num="0015"> As described above, in the organic light emitting panel according to one aspect of the present invention, it is possible to prevent unevenness in the film thickness of the organic light emitting layer with respect to the light emitting portion in the same pixel portion, and good light emitting characteristics in the same pixel portion can be obtained.</p>
<figref num="1">It is a block diagram which shows the schematic structure of the organic display device 1 which concerns on Embodiment 1. FIG.</figref><figref num="2">It is a schematic cross-sectional view which shows a part of sub-pixel 100 in a display panel 10.</figref><figref num="3">It is a schematic plan view which shows the bank 105 in the display panel 10.</figref><figref num="4">It is a schematic cross-sectional view which shows the structure of the sub-pixels 100a to 100c in the display panel 10 and the banks 105a to 105d which partition between each sub-pixel 100a to 100c.</figref><figref num="5">(A) is a schematic cross-sectional view showing a pinning position when the taper angle of the bank side surface portion is small, and (b) is a schematic cross-sectional view showing a pinning position when the taper angle of the bank side surface portion is large. (C) is a schematic cross-sectional view showing the state of the organic light emitting layer after drying when the taper angle of the bank side surface is small, and (d) is the organic after drying when the taper angle of the bank side surface is large. It is a schematic cross-sectional view which shows the state of a light emitting layer.</figref><figref num="6">It is a figure which shows the relationship between the inclination angle (taper angle) θ in the surface portion of a bank, the height H of a pinning position, and the film thickness T of an organic light emitting layer.</figref><figref num="7">It is a figure which shows the film thickness distribution of the organic light emitting layer in Samples 1-3.</figref><figref num="8">It is a figure which shows the film thickness distribution of the organic light emitting layer in samples 4 and 5.</figref><figref num="9">(A) to (c) are schematic cross-sectional views showing the main steps in the manufacturing method of the display panel 10 in order.</figref><figref num="10">(A) to (c) are schematic cross-sectional views showing the main steps in the manufacturing method of the display panel 10 in order.</figref><figref num="11">(A) and (b) are schematic cross-sectional views which show in order the main steps in the manufacturing method of a display panel 10.</figref><figref num="12">(A) is a schematic flow chart showing a process order related to application and drying of inks 1060a to 1060c, and (b) is a schematic flow chart showing another process order related to coating and drying ink 1060a to 1060c. is there.</figref><figref num="13">It is a schematic cross-sectional view which shows the main part process in the manufacturing method which concerns on modification 1. FIG.</figref><figref num="14">(A) and (b) are schematic cross-sectional views which show the main steps in order in the manufacturing method which concerns on modification 2.</figref><figref num="15">(A) and (b) are schematic cross-sectional views which show the main steps in order in the manufacturing method which concerns on modification 2.</figref><figref num="16">(A) is a diagram showing the relationship between the exposure / development process and the taper angle of the bank, and (b) is an AFM showing the shape of the formed bank.</figref><figref num="17">FIG. 5 is a schematic cross-sectional view showing the configurations of sub-pixels 300a to 300c, non-pixel portions 300d and 300e, and banks 305a to 305e in a display panel included in the organic display device according to the second embodiment.</figref><figref num="18">(A) to (c) are schematic cross-sectional views showing steps of applying inks 3060a to 3060c in order.</figref><figref num="19">(A) and (b) are schematic cross-sectional views for explaining the definition of a taper angle.</figref><figref num="20">It is a schematic plan view for demonstrating the area 10a1, 10a2, 10b in a display panel 10.</figref><figref num="21">FIG. 5 is an external perspective view showing an example of the appearance of a set including the organic display device 1.</figref><figref num="22">It is a schematic plan view which shows the structure of the bank 805 provided in the display panel 80 which concerns on modification 3. FIG.</figref><figref num="23">(A) and (b) are schematic cross-sectional views showing a biased state of the film thickness distribution of the organic light emitting layer for each adjacent subpixel in the display panel.</figref><figref num="24">(A) to (c) are schematic cross-sectional views showing the vapor concentration distribution at the time of forming the organic light emitting layer and the state of the film shape being biased in the ink drying step.</figref>
[Summary of one aspect of the present invention] The organic light emitting panel according to one aspect of the present invention is an organic light emitting panel in which a plurality of pixel portions are arranged, and each pixel portion of the plurality of pixel portions has a different emission color from each other and is arranged in order. It has a light emitting part. Each light emitting portion has an organic light emitting layer including a first electrode, an organic light emitting layer provided facing the base layer and formed by applying an ink containing an organic light emitting material corresponding to each light emitting color, and an organic light emitting layer. It includes a second electrode formed on the opposite side of the base layer.
Further, in the organic light emitting panel according to one aspect of the present invention, a plurality of light emitting parts in the same pixel part are sequentially coated with ink corresponding to each light emitting color from one side to the other side, thereby forming an organic light emitting layer. Is formed, and is located on one side and the corresponding ink is applied to the first round, and the second light emitting part is located on the center side and the corresponding ink is applied to the second round. It has at least a light emitting part and a third light emitting part located on the other side and to which the corresponding ink is applied in the third round, and above the base layer, adjacent to each other among the plurality of light emitting parts. A plurality of partition walls are provided which partition the light emitting part and define each light emitting part. Then, in the organic light emitting panel according to one aspect of the present invention, the inclination angles of the facing surface portions of the two adjacent partition walls that define the first light emitting portion are equal among the plurality of pixel portions, and the second light emitting portion is defined. The inclination angles of the facing surfaces of the two adjacent partition walls are different, and the inclination angle of the surface portion of the partition wall located on the third light emitting portion side is larger than the inclination angle of the surface portion of the partition wall located on the first light emitting portion side. It is characterized by including a pixel portion that satisfies the relationship of being large.
In the organic light emitting panel according to one aspect of the present invention, since the corresponding ink is applied to the first light emitting portion in the first round to form the organic light emitting layer, the first light emitting portion is formed when the first light emitting portion is formed. In the region adjacent to the light emitting portion, the ink is not applied, the ink vapor concentration is equal to "0" on one end side and the other end side of the first light emitting portion, and the film thickness of the organic light emitting layer is biased. There is no. Therefore, by making the inclination angles of the facing surfaces of the adjacent partition walls equal to each other for the first light emitting portion, it is possible to prevent the film thickness from being biased and obtain good light emitting characteristics.
On the other hand, in the second light emitting portion, the corresponding ink is applied in the second round to form the organic light emitting layer. Therefore, when the second light emitting portion is formed, the ink is formed in the region adjacent to the second light emitting portion. The vapor concentration will be different. That is, in the second light emitting portion, the vapor concentration of the ink is higher on one end side, which is the first light emitting portion side, than on the other end side, which is the third light emitting portion side. Therefore, in the second light emitting portion, the film thickness of the light emitting layer on the other end side of the organic light emitting portion on the third light emitting portion side is larger than the film thickness of the light emitting layer on the one end side on the first light emitting portion side. Therefore, the film thickness tends to be biased.
However, according to the above configuration according to one aspect of the present invention, the inclination angle of the surface portion of the partition wall located on the third light emitting portion side of the facing surface portions of the two adjacent partition walls defining the second light emitting portion is the first. Since the angle of inclination of the surface of the partition wall located on the light emitting portion side is larger, the pinning position of the ink on the partition wall located on the third light emitting portion side is relative to the pinning position of the ink on the partition wall located on the first light emitting portion side. Higher. As a result, the film thickness of the organic light emitting layer on the third light emitting portion side can be suppressed, and unevenness in the film thickness at one end and the other end of the second light emitting portion can be prevented.
As described above, in the organic light emitting panel according to one aspect of the present invention, it is possible to prevent unevenness in the film thickness of the organic light emitting layer with respect to the light emitting portion in the same pixel portion, and good light emitting characteristics in the same pixel portion can be obtained.
In the above, the "tilt angle" corresponds to each side surface portion of the bank and the base layer (first electrode or hole injection layer, hole transport layer, and further hole injection transport layer) in which the bank is provided. It is the angle formed by the upper surface of).
In the organic light emitting panel according to one aspect of the present invention, in the above configuration, a plurality of pixel portions are formed so as to be continuously adjacent to each other, and the facing surface portions of the two adjacent partition walls defining the third light emitting portion are formed. It is possible to adopt a configuration in which the inclination angles are equal.
When the above configuration is adopted, in addition to the above effect, by equalizing the inclination angles of the facing surfaces of the two adjacent partition walls that define the third light emitting portion, the film thickness is not biased during manufacturing. With respect to the three light emitting portions, it is possible to prevent unevenness in the film thickness of the organic light emitting layer, and it is possible to obtain good light emitting characteristics. As a result, good light emission characteristics can be obtained in the plurality of pixel portions.
In addition, "equal" in the above does not necessarily mean that they are completely equal in terms of numerical values, but takes into consideration dimensional errors in the manufacture of organic light emitting panels and the like. Specifically, it means that the inclination angles are equalized within a range in which the difference in luminous efficiency (luminance unevenness) of the pixel portions belonging to each of the central portion and the outer peripheral portion of the panel is practically acceptable.
In the organic light emitting panel according to one aspect of the present invention, in the above configuration, the inclination angle of the facing surfaces of the partition walls located on the first light emitting portion side of the two adjacent partition walls defining the second light emitting portion is the first. It is possible to adopt a configuration in which the inclination angles of the facing surfaces of the two adjacent partition walls that define the light emitting portion are equal to each other.
When the above configuration is adopted, the ink is already applied to the first light emitting portion in the first round in the second light emitting portion where the ink is applied in the second round. , The ink vapor concentration on one end side, which is the first light emitting part side, is higher than that on the other end side, which is the third light emitting part side. The organic light emitting layer formed by making the inclination angle of the facing surfaces of the partition wall located on the first light emitting portion side equal to the inclination angle of the facing surfaces of the two adjacent partition walls defining the first light emitting portion. It is possible to suppress the unevenness of the film thickness.
In the organic light emitting panel according to one aspect of the present invention, in the above configuration, the inclination angle of the facing surfaces of the partition walls located on the first light emitting portion side of the two adjacent partition walls defining the second light emitting portion is a third. It is possible to adopt a configuration in which the inclination angles of the facing surfaces of the two adjacent partition walls that define the light emitting portion are equal to each other.
When the above configuration is adopted, the ink is already applied to the first light emitting portion in the first round in the second light emitting portion where the ink is applied in the second round. , The ink vapor concentration on one end side, which is the first light emitting part side, is higher than that on the other end side, which is the third light emitting part side. The organic light emitting layer formed by making the inclination angle of the facing surfaces of the partition wall located on the first light emitting portion side equal to the inclination angle of the facing surfaces of the two adjacent partition walls defining the third light emitting portion. It is possible to suppress the unevenness of the film thickness.
In the above configuration, the adjacent pixel portions and the pixel portions are continuously formed, and the non-pixel portion for arranging the bus bar is not provided between them. Therefore, ink is applied to the third light emitting portion. In the case of coating, there is no difference in the vapor concentrations on both sides, and therefore, the inclination angles of the facing surfaces of the two adjacent partition walls that define the third light emitting portion are set to be equal to each other.
In the organic light emitting panel according to one aspect of the present invention, in a configuration in which the pixel portions are continuously adjacent to each other, the inclination angle of the surface portion of each partition wall can be specifically set within the following range.
(A1) The inclination angle of the facing surfaces of the partition walls located on the third light emitting portion side of the two adjacent partition walls defining the second light emitting portion can be set to 35 [°] or more and 45 [°] or less. ..
(A2) The inclination angle of the facing surfaces of the partition walls located on the first light emitting portion side of the two adjacent partition walls defining the second light emitting portion can be set to 25 [°] or more and 35 [°] or less. ..
(A3) The inclination angle of the facing surface portions of the two adjacent partition walls that define the first light emitting portion can be set to 25 [°] or more and 35 [°] or less.
(A4) The inclination angle of the facing surface portions of the two adjacent partition walls that define the third light emitting portion can be set to 25 [°] or more and 35 [°] or less.
In the organic light emitting panel according to one aspect of the present invention, in the above configuration, a non-pixel portion is formed between each of the adjacent pixel portions of the plurality of pixel portions, and a pixel portion and a pixel portion are formed between the pixel portion and the non-pixel portion. A partition wall for partitioning the non-pixel portion is formed, and in each pixel portion, the inclination angles of the facing surfaces of the two adjacent partition walls defining the third light emitting portion are different, and the surface portion of the partition wall located on the non-pixel portion side. It is possible to adopt a configuration in which the inclination angle of is larger than the inclination angle of the surface portion of the partition wall located on the second light emitting portion side.
In the case of a configuration in which a non-pixel portion is formed between each of the adjacent pixel portions in this way, in the third light emitting portion where the ink is applied in the third round, the steam concentration is different from that of the second light emitting portion side. Although it will be different on the pixel portion side, as described above, the inclination angles of the facing surface portions of the two adjacent partition walls that define the third light emitting portion are different, and the surface portion of the partition wall located on the non-pixel portion side. By adopting a configuration in which the inclination angle is larger than the inclination angle of the surface portion of the partition wall located on the second light emitting portion side, the unevenness of the film thickness of the organic light emitting layer is suppressed by the relative adjustment of the pinning position of the ink. Can be done.
In the organic light emitting panel according to one aspect of the present invention, in the above configuration, the non-pixel portion is formed of the second electrode and the same material as the first electrode without including the organic light emitting layer. A configuration can be adopted in which the second electrode and the third electrode are electrically connected, including the electrode.
For example, in a top-emission type organic light emitting panel, a light-transmitting material (for example, ITO or IZO) may be used as a second electrode arranged above the organic light emitting layer (light extraction side). As usual, these materials have high electrical resistance. Therefore, in the non-pixel portion, the second electrode and the third electrode are connected to reduce the electric resistance, and even when the panel size is large, a voltage drop is unlikely to occur, and high light emission characteristics can be ensured. The third electrode is, for example, a bus bar.
In the organic light emitting panel according to one aspect of the present invention, in the above configuration, the inclination angle of the facing surfaces of the partition walls located on the third light emitting portion side of the two adjacent partition walls defining the second light emitting portion is the first. The angle of inclination of the facing surfaces of the partition wall located on the light emitting portion side is larger than the inclination angle of the facing surfaces of the partition wall located on the non-pixel portion side of the two adjacent partition walls defining the third light emitting portion. , It is possible to adopt a configuration in which the inclination angle of the facing surface portion of the partition wall located on the second light emitting portion side is larger than that.
When this configuration is adopted, the inclination angle of the surface portion of the partition wall located on the third light emitting portion side of the opposing surface portions of the two adjacent partition walls defining the second light emitting portion is set to the first light emitting portion side. By making it larger than the inclination angle of the surface portion of the partition wall where it is located, the pinning position of the ink applied to the second light emitting portion is set to the first light emitting portion side with respect to the corresponding surface portion of the partition wall on the third light emitting portion side. The partition wall can be made relatively higher than the corresponding surface portion of the partition wall, and the uneven thickness of the formed organic light emitting layer can be suppressed.
In the organic light emitting panel according to one aspect of the present invention, in the above configuration, in the two adjacent partition walls defining the second light emitting portion, the inclination angle of the facing surfaces of the partition walls located on the third light emitting portion side and the third It is possible to adopt a configuration in which the inclination angles of the facing surfaces of the partition walls located on the non-pixel portion side of the two adjacent partition walls that define the light emitting portion are equal to each other.
When this configuration is adopted, since the non-pixel portions are arranged adjacent to the third light emitting portion, the ink is applied to the third light emitting portion from the second light emitting portion side. Although the steam concentration is low on the non-pixel portion side, the inclination angle of the facing surfaces of the partition walls located on the non-pixel portion side of the two adjacent partition walls that define the third light emitting portion is set to the second. By making it equal to the inclination angle of the facing surfaces of the partition walls located on the third light emitting portion side of the two adjacent partition walls that define the light emitting portion, the organic light emitting layer in the third light emitting portion is similarly formed in the same manner as the second light emitting portion. It is possible to suppress the unevenness of the film thickness.
In the organic light emitting panel according to one aspect of the present invention, in the above configuration, the inclination angle of the facing surfaces of the partition walls located on the first light emitting portion side of the two adjacent partition walls defining the second light emitting portion is the first. It is possible to adopt a configuration in which the inclination angles of the facing surfaces of the two adjacent partition walls that define the light emitting portion are equal to each other.
When the ink is applied to the second light emitting part, the ink is already applied to the first light emitting part adjacent to the second light emitting part, so that the vapor concentration on the first light emitting part side is the third light emitting part. It is in a state higher than the vapor concentration on the part side, and the film thickness of the organic light emitting layer tends to be thicker on the third light emitting part side, but such a tendency is small on the first light emitting part side. .. Therefore, when the above configuration is adopted, the relative thickness deviation of the organic light emitting layer of the second light emitting portion can be suppressed by defining the inclination angle of the surface portion of the partition wall in the above relationship.
In the organic light emitting panel according to one aspect of the present invention, in the above configuration, the inclination angle of the facing surfaces of the partition walls located on the second light emitting portion side of the two adjacent partition walls defining the third light emitting portion is the first. It is possible to adopt a configuration in which the inclination angles of the facing surfaces of the two adjacent partition walls that define the light emitting portion are equal to each other.
When applying ink to the third light emitting portion, the film thickness of the organic light emitting layer tends to be thicker on the non-pixel portion side due to the uneven vapor concentration, but on the second light emitting portion side, the film thickness tends to be thicker. There is little tendency like this. Therefore, when the above configuration is adopted, the relative thickness deviation of the organic light emitting layer of the third light emitting portion can be suppressed by defining the inclination angle of the surface portion of the partition wall in the above relationship.
In the organic light emitting panel according to one aspect of the present invention, in the configuration in which the non-pixel portion is arranged between the adjacent pixel portions, the inclination angle of the surface portion of each partition wall can be specifically set within the following range. it can.
(B1) The inclination angle of the facing surfaces of the partition walls located on the third light emitting portion side of the two adjacent partition walls defining the second light emitting portion can be set to 35 [°] or more and 45 [°] or less. ..
(B2) The inclination angle of the facing surfaces of the partition walls located on the non-pixel portion side of the two adjacent partition walls defining the third light emitting portion can be 35 [°] or more and 45 [°] or less.
(B3) The inclination angle of the facing surfaces of the partition walls located on the first light emitting portion side of the two adjacent partition walls defining the second light emitting portion can be set to 25 [°] or more and 35 [°] or less. ..
(B4) The inclination angle of the facing surfaces of the partition walls located on the second light emitting portion side of the two adjacent partition walls defining the third light emitting portion can be set to 25 [°] or more and 35 [°] or less. ..
(B5) The inclination angle of the facing surface portions of the two adjacent partition walls that define the first light emitting portion can be set to 25 [°] or more and 35 [°] or less.
In the organic light emitting panel according to one aspect of the present invention, in the above configuration, the inclination angle is defined as the angle formed by the facing surfaces of the partition wall and the upper surface of the base layer on which the partition wall is formed. Can be done.
In the organic light emitting panel according to one aspect of the present invention, the base layer includes a TFT (thin film transistor) layer formed below the first electrode, and in each pixel portion, the first electrode is a TFT. It is possible to adopt a configuration in which the layers are electrically connected.
The organic display device according to the present invention is characterized by including the organic light emitting panel according to any one of the above. Therefore, the organic display device according to one aspect of the present invention has the same effect as the organic display panel according to one aspect of the present invention.
The method for manufacturing an organic light emitting panel according to one aspect of the present invention is a method for manufacturing an organic light emitting panel in which a plurality of pixel portions are arranged, and has the following steps.
(First step) A base layer including the first electrode is formed on the substrate.
(Second step) A photosensitive resist material is laminated on the base layer.
(Third Step) By mask-exposing and patterning the laminated photosensitive resist material, a plurality of openings corresponding to a plurality of light emitting parts are formed for each pixel part, and adjacent light emitting parts are partitioned. A plurality of partition walls are formed to define each light emitting portion.
(Fourth Step) An ink containing an organic light emitting material is dropped and dried for each of a plurality of openings to form an organic light emitting layer.
(Fifth step) A second electrode is formed above the organic light emitting layer.
In the method for manufacturing an organic light emitting panel according to one aspect of the present invention, in the third step, each pixel portion has a first opening corresponding to a first light emitting portion located on one side and a first opening located on the center side. A second opening corresponding to the two light emitting portions and a third opening corresponding to the third light emitting portion located on the other side are formed, and further, the facing surfaces of the two adjacent partition walls defining the first light emitting portion are formed. Form the tilt angles equally.
Further, in the method for manufacturing an organic light emitting panel according to one aspect of the present invention, in the third step, of the second light emitting part and the third light emitting part, at least two adjacent partition walls that define the second light emitting part face each other. The inclination angle of the surface portion is different, and the inclination angle of the surface portion of the partition wall located on the third light emitting portion side is formed to be larger than the inclination angle of the surface portion of the partition wall located on the first light emitting portion side.
Further, in the method for manufacturing an organic light emitting panel according to one aspect of the present invention, in the fourth step, the ink corresponding to each light emitting color is applied to the first opening, the second opening, and the third opening for each pixel portion. It is characterized in that it is dropped in order to form an organic light emitting layer.
If the manufacturing method according to one aspect of the present invention is adopted, the inclination angles of the facing surfaces of the two adjacent partition walls that define at least the second light emitting portion are different, and the partition wall located on the third light emitting portion side is used. It is possible to realize a configuration in which the inclination angle of the surface portion is formed to be larger than the inclination angle of the surface portion of the partition wall located on the first light emitting portion side, and the vapor concentration from ink dropping (application) to drying can be realized. It is possible to suppress the bias of the film thickness of the organic light emitting layer due to the bias. Therefore, if the manufacturing method according to one aspect of the present invention is adopted, an organic light emitting panel having good light emitting characteristics can be manufactured.
In the method for manufacturing an organic light emitting panel according to one aspect of the present invention, in the above configuration, in the third step, regarding the exposure of the photosensitive resist material, the third light emitting part in the two adjacent partition walls defining the second light emitting part. The second light emitting portion is defined by making the exposure amount to the portion corresponding to the surface portion of the partition wall located on the side larger than the exposure amount to the portion corresponding to the surface portion of the partition wall located on the first light emitting portion side. It is possible to adopt a configuration in which the inclination angle of the surface portion of the partition wall located on the third light emitting portion side of the two adjacent partition walls is made larger than the inclination angle of the surface portion of the partition wall located on the first light emitting portion side. ..
When this configuration is adopted, the inclination angle of the surface portion of the partition wall can be changed according to the location by adjusting the exposure amount, whereby the pinning position at the time of ink dropping can be adjusted. Therefore, an organic light emitting panel having good light emitting characteristics can be manufactured.
In the method for manufacturing an organic light emitting panel according to one aspect of the present invention, in the above configuration, in the third step, regarding the exposure of the photosensitive resist material, the third light emitting portion in the two adjacent partition walls that define the second light emitting portion. The transmittance of light to the portion corresponding to the surface portion of the partition wall located on the side is smaller than the transmittance of light to the portion corresponding to the surface portion of the partition wall located on the first light emitting portion side. By using different masks for the portion corresponding to the surface portion, the inclination angle of the surface portion of the partition wall located on the third light emitting portion side in the two adjacent partition walls defining the second light emitting portion can be determined by the first light emitting portion. It is possible to adopt a configuration in which the inclination angle of the surface portion of the partition wall located on the side is made larger than that.
When this configuration is adopted, the tilt angle on the surface of the partition wall can be changed according to the location by adjusting the light transmittance in the mask, whereby the pinning position at the time of ink dropping can be adjusted. it can. Therefore, an organic light emitting panel having good light emitting characteristics can be manufactured.
In the method for manufacturing an organic light emitting panel according to one aspect of the present invention, in the above configuration, in the third step, after the photosensitive resist material is exposed and developed, the two adjacent partition walls defining the second light emitting portion are used. By performing an additional exposure process on the portion corresponding to the surface portion of the partition wall located on the third light emitting portion side, the portion is located on the third light emitting portion side of the two adjacent partition walls defining the second light emitting portion. It is possible to adopt a configuration in which the inclination angle of the surface portion of the partition wall is made larger than the inclination angle of the surface portion of the partition wall located on the first light emitting portion side.
When this configuration is adopted, the inclination angle on the surface portion of the partition wall can be changed according to the location by providing a portion where the exposure process is additionally executed and a portion where the exposure process is not added. The pinning position can be adjusted. Therefore, an organic light emitting panel having good light emitting characteristics can be manufactured.
The organic display device according to one aspect of the present invention is characterized by including an organic light emitting panel obtained by the production method according to any one of the above.
The organic display device thus obtained has the same effect as that of the organic light emitting panel obtained by the above manufacturing method.
[Embodiment] Hereinafter, an example of a mode for carrying out the present invention will be described with reference to the drawings.
The forms used in the following description are examples used to explain the structure, action, and effect of the present invention in an easy-to-understand manner, and the present invention is limited to the following forms other than the essential feature portions thereof. I don't receive it.
(History of obtaining the embodiment according to the present invention) The present inventor has obtained the following findings as a result of diligent research on the organic light emitting panel described in [Background Art] and the organic display device provided with the organic light emitting panel.
Usually, as shown in FIG. 23A, an anode electrode 902 and an electrode coating layer 903 covering the anode electrode 902 are provided on the substrate 901 for each subpixel 900a, 900b, 900c. Then, a hole injection layer 904 is formed so as to cover the surfaces of the electrode coating layer 902 and the substrate 901, and the organic light emitting layer 906a, whose emission color is different for each subpixel 900a, 900b, 900c, is formed on the hole injection layer 904. 906b and 906c are laminated and formed. The organic light emitting layers 906a, 906b, 906c are partitioned by banks 905a to 905d erected on the hole injection layer 904.
As shown in FIG. 23A, in the organic light emitting panel according to the prior art, the organic light emitting layer 906b of the sub-pixel 900b arranged in the central portion in the arrangement order may have a bias in the film thickness. .. Specifically, the location C in the bank 905c of the organic light emitting layer 906b.<sub>3</sub>The height of is the location C at bank 905b.<sub>2</sub>And the location C on the bank 905b side of the organic light emitting layer 906a in the subpixel 900a.<sub>1</sub>The phenomenon that it becomes higher than the height of.
Further, as another example, as shown in FIG. 23 (b), the respective locations C on the banks 955c and 955d side of the organic light emitting layers 956b and 956c in the sub-pixels 950b and 950c.<sub>12</sub>, C<sub>14</sub>The height of each of the organic light emitting layers 956b and 956c on the bank 955b and 955c side is C.<sub>11</sub>, C<sub>13</sub>The phenomenon that it becomes higher than the height of. As shown in FIG. 23B, in the organic light emitting layer 956a in the sub-pixel 950a, the height of the portion on the bank 955a side and the height of the portion on the bank 955b side are substantially equal, and the film thickness is greatly biased. Absent.
After repeated studies on the above phenomenon, the present inventor presumes that the decrease in film thickness uniformity in the organic light emitting layer is caused by the non-uniformity of the vapor concentration distribution during ink drying, as described below. did. Specifically, as shown in FIG. 24A, it is assumed that the ink 9060b for forming the organic light emitting layer is applied to the region defined between the bank 905b and the bank 905c, and at that time. When the vapor concentration distribution is lower on the right side than on the left side in FIG. 24 (a) as shown by the alternate long and short dash line, it is considered that the film thickness of the organic light emitting layer is biased due to the following relationship. ..
As shown in FIG. 24A, immediately after the ink 9060b is dropped, the surface profile L of the ink 9060b is L.<sub>90</sub>Has a shape in which the central part of the sub-pixel is raised. When this is dried, the evaporation rate is high on the low vapor concentration side and slow on the high vapor concentration side due to the distribution of the steam concentration as described above.<sub>91</sub>Formally considered to change to.
However, as shown in FIG. 24 (b), inside the ink 9061b in the process of drying, the broken line arrow L<sub>92</sub>It causes the movement of the solvent as shown by. This is because the solvent moves so as to make up for the evaporated amount (moves so as to minimize the surface free energy), and the solute (organic light emitting material) also moves as the solvent moves. Therefore, as shown in FIG. 24 (c), when the vapor concentration distribution is biased, the surface profile L<sub>93</sub>The organic light emitting layer 906b, which is raised toward the right side, is formed.
As described above, the present inventor has obtained an inference that the uniformity of the film thickness of the formed organic light emitting layer is lowered due to the non-uniformity of the vapor concentration distribution during ink drying with respect to the organic light emitting panel. ..
Then, the present inventor makes the pinning position on the side surface portion of the ink bank different by making the inclination angle of the surface portion in the bank different in the panel surface, and as a result, aims to make the film thickness of the organic light emitting layer uniform. I found the technical feature.
[Embodiment 1] 1. 1. Schematic configuration of display device 1 The overall configuration of the display device 1 according to the present embodiment will be described with reference to FIG.
As shown in FIG. 1, the display device (organic display device) 1 includes a display panel (organic light emitting panel) unit 10 and a drive control unit 20 connected to the display panel (organic light emitting panel) unit 10. The display panel unit 10 is an organic light emitting panel that utilizes an electroluminescent phenomenon of an organic material, and a plurality of pixel parts are two-dimensionally arranged in the XY plane directions.
Further, the drive control unit 20 is composed of four drive circuits 21 to 24 and a control circuit 25.
In the actual display device 1, the arrangement of the drive control unit 20 with respect to the display panel unit 10 is not limited to this.
2. 2. Configuration of display panel 10 The configuration of the display panel 10 will be described with reference to FIG. As an example, the display panel 10 according to the present embodiment employs a top emission type organic light emitting panel, and has an organic light emitting color having any of red (R), green (G), and blue (B). A plurality of pixel portions having layers are arranged and configured in a matrix, and in FIG. 2, one sub-pixel 100 in one pixel portion is extracted and drawn.
As shown in FIG. 2, in the display panel 10, an anode electrode 102 is formed on a TFT substrate (hereinafter, simply referred to as a substrate) 101, and an electrode coating layer is formed on the anode electrode 102. The 103 and the hole injection transport layer 104 are laminated and formed in this order. The anode electrode 102 and the electrode coating layer 103 are formed in a state of being separated for each subpixel 100.
On the hole injection transport layer 104, a bank (partition wall) 105 made of an insulating material and partitioning between the subpixels 100 is erected. An organic light emitting layer 106 is formed in a region partitioned by a bank 105 in each subpixel 100, and an electron injection layer 107, a cathode electrode 108, and a sealing layer 109 are laminated and formed in this order on the organic light emitting layer 106. ..
a) Substrate 101 The substrate 101 is, for example, non-alkali glass, soda glass, non-fluorescent glass, phosphoric acid glass, boric acid glass, quartz, acrylic resin, styrene resin, polycarbonate resin, epoxy resin, polyethylene, polyester, silicone resin. , Or is formed based on an insulating material such as alumina. Although not shown, the substrate 101 is laminated with a TFT layer, a passivation film, an interlayer insulating film, and the like.
b) Anode electrode 102 The anode electrode 102 is composed of a single layer made of a conductive material or a laminated body in which a plurality of layers are laminated. For example, Al (aluminum) or an alloy containing the same, Ag (silver), APC (silver). , Palladium, copper alloy), ARA (silver, rubidium, gold alloy), MoCr (molybdenum and chromium alloy), NiCr (nickel and chromium alloy) and the like. In the case of the top emission type as in the present embodiment, it is preferable that the material is made of a highly reflective material.
c) Electrode coating layer 103 The electrode coating layer 103 is formed by using, for example, ITO (indium tin oxide), and covers at least a part of the surface of the upper portion of the anode electrode 102 in the Z-axis direction.
d) Hole injection transport layer 104 The hole injection transport layer 104 is formed by, for example, an oxide such as silver (Ag), molybdenum (Mo), chromium (Cr), vanadium (V), tungsten (W), nickel (Ni), iridium (Ir), or A layer made of a conductive polymeric material such as PEDOT (a mixture of polythiophene and polystyrene sulfonic acid). Among the above, the hole injection transport layer 104 made of a metal oxide has a function of injecting and transporting holes to the organic light emitting layer 106 in a stable manner or assisting the formation of holes, and has a large work function. Has.
Here, when the hole injection transport layer 104 is composed of an oxide of a transition metal, a plurality of oxidation numbers are taken, so that a plurality of levels can be taken, and as a result, hole injection becomes easy and drives. The voltage can be reduced.
e) Bank 105 The bank (partition wall) 105 is made of an organic material such as resin and has an insulating property. Examples of the organic material used for forming the bank 105 include acrylic resin, polyimide resin, novolac type phenol resin and the like. The bank 105 preferably has organic solvent resistance.
Further, since the bank 105 is formed by etching treatment, baking treatment, etc., it is preferable that the bank 105 is formed of a material having high resistance to such treatments so as not to be excessively deformed or deteriorated. In addition, the side surface portion can be treated with fluorine in order to have water repellency.
Regarding the insulating material used for forming the bank 105, the resistivity is 10 in particular, including each of the above materials.<sup>5</sup>A material having [Ω · cm] or more and having water repellency can be used. It has a resistivity of 10<sup>5</sup>When a material of [Ω · cm] or less is used, it causes a leak current between the anode electrode 102 and the cathode electrode 108 or a leak current between adjacent subpixels 100, resulting in an increase in power consumption. This is because it causes various problems such as.
Further, when the bank 105 is formed by using a hydrophilic material, the difference in lipophilicity / liquid repellency between the side surface portion of the bank 105 and the surface of the hole injection transport layer 104 becomes small, and the organic light emitting layer 106 is formed. This is because it becomes difficult to selectively hold the ink containing the organic substance in the opening of the bank 105 for forming.
Further, as the structure of the bank 105, not only the one-layer structure as shown in FIG. 2 but also a multi-layer structure having two or more layers can be adopted. In this case, the above materials can be combined for each layer, or an inorganic material and an organic material can be used for each layer.
f) Organic light emitting layer 106 The organic light emitting layer 106 has a function of generating an excited state and emitting light by recombination of holes injected from the anode electrode 102 and electrons injected from the cathode electrode 108. As the material used for forming the organic light emitting layer 106, it is necessary to use a light emitting organic material that can form a film by using a wet printing method.
Specifically, for example, the oxinoid compound, the perylene compound, the coumarin compound, the azacumine compound, the oxazole compound, the oxaziazole compound, the perinone compound, the pyrolopyrrole compound, and the naphthalene described in Japanese Patent Application Laid-Open No. 5-163488 Compounds, anthracene compounds, fluorene compounds, fluoranthene compounds, tetracene compounds, pyrene compounds, coronen compounds, quinolone compounds and azaquinolone compounds, pyrazoline derivatives and pyrazolone derivatives, rhodamine compounds, chrysene compounds, phenanthrene compounds, cyclopentadiene compounds, stillben compounds, diphenylquinone Compounds, styryl compounds, butadiene compounds, dicyanomethylenepyran compounds, dicyanomethylenethiopyran compounds, fluorescein compounds, pyrylium compounds, thiapyrylium compounds, selenapyrium compounds, tellropyrylium compounds, aromatic aldaziene compounds, oligophenylene compounds, thioxanthene compounds, anthracene Formed from fluorescent substances such as compounds, cyanine compounds, acrydin compounds, metal complexes of 8-hydroxyquinolin compounds, metal complexes of 2-bipyridine compounds, complexes of Schiff salts and Group III metals, oxine metal complexes, and rare earth complexes. Is preferable.
g) Electron injection layer 107 The electron injection layer 107 has a function of transporting electrons injected from the cathode electrode 108 to the organic light emitting layer 106, and is preferably formed of, for example, barium, phthalocyanine, lithium fluoride, or a combination thereof.
h) Cathode electrode 108 The cathode electrode 108 is made of, for example, ITO, IZO (indium zinc oxide), or the like. In the case of the top emission type display panel 10, it is preferably formed of a light transmitting material. Regarding light transmittance, it is preferable that the transmittance is 80 [%] or more.
In addition to the above, as the material used for forming the cathode electrode 108, for example, a structure in which a layer containing an alkali metal, an alkaline earth metal, or a halide thereof and a layer containing silver are laminated in this order is used. You can also. In the above, the layer containing silver may be formed of silver alone or of a silver alloy. Further, in order to improve the light extraction efficiency, a highly transparent refractive index adjusting layer may be provided on the layer containing the silver.
i) Sealing layer 109 The sealing layer 109 has a function of suppressing exposure of the organic light emitting layer 106 and the like to moisture and air, and is a material such as SiN (silicon nitride) and SiON (silicon oxynitride). Is formed using. In the case of the top emission type display panel 10, it is preferably formed of a light transmitting material.
3. 3. Configuration of bank 105 As shown in FIG. 3, the display panel 10 according to the present embodiment employs a line-shaped bank 105 as an example. Specifically, each of the banks 105 is stretched and formed in the Y-axis direction, and partitions between adjacent pixel portions 100 in the X-axis direction. The sub-pixel 100 is formed so that the emission color is different for each region partitioned by the bank 105. For example, the sub-pixel 100 has three emission colors of red (R), green (G), and blue (B). A pixel portion is composed of a combination of two sub-pixels.
4. Configuration of bank 105 for each area The configuration of the bank 105 for each region will be described with reference to FIG. Note that FIG. 4 is a cross-sectional end view in which the display panel 10 in FIG. 1 is cut along the AA'cross section and a part thereof is schematicized.
As shown in FIG. 4, in the pixel portion, sub-pixels 100a, sub-pixels 100b, and sub-pixels 100c are continuously arranged in order from the left side in the X-axis direction. In the display panel 10 according to the present embodiment, the pixel portions and the pixel portions are arranged so as to be continuously adjacent to each other.
The sub-pixel 100a is defined by the bank 105a and the bank 105b, the sub-pixel 100b is defined by the bank 105b and the bank 105c, and the sub-pixel 100c is defined by the bank 105b and the bank 105d. In each of the banks 105a, 105b, 105c, 105d, the surface portions 105aa, 105ba, 105bb, 105cc, 105cc, 105dc and the surface of the hole injection transport layer 104, which is the base layer, have angles θaa, θba, θbb, θbc, respectively. It forms θcc and θdc.
Here, in the present embodiment, the angles θaa, θba, θbb, θcc, θcc, and θdc satisfy the relationships shown by the following equations.
[Equation 1] θcc> θaa = θba = θbb = θcc = θdc In the present embodiment, it is desirable that the respective angles θaa, θba, θbb, θcc, θcc, and θdc satisfy the above-mentioned relationship [Equation 1] and are set within the following ranges.
[Number 2] 25 [°] <θaa = θba = θbb = θcc = θdc <35 [°] [Number 3] 35 [°] <θcb <45 [°] 5. Relationship between the inclination angle θ of the side surface portion in the bank 105 and the film thickness of the organic light emitting layer 106 The relationship between the inclination angle θ of the surface portion in the bank 105 and the film thickness of the organic light emitting layer 106 will be described with reference to FIGS. 5 and 6. In FIG. 5, the structure of one subpixel is schematically drawn.
As shown in FIG. 5A, the inclination angle of the surface portion of the bank 105x (the angle formed by the surface portion of the bank 105x and the surface of the hole injection transport layer 104) is the angle θx, and as shown in FIG. 5B. The inclination angle of the surface portion of the bank 105y (the angle formed by the surface portion of the bank 105y and the surface of the hole injection transport layer 104) is the angle θy. The angle θx and the angle θy satisfy the following relationship.
[Number 4] θy> θx When the inks 1060x and 1060y containing the organic light emitting material are dropped (applied) to the openings partitioned by the banks 105x and 105y, the heights Hx and Hy of the pinning positions Px and Py have the following relationship.
[Number 5] Hy> Hx As shown in FIG. 5C, when the ink 1060x is dried, the central portion of the subpixel is formed in the organic light emitting layer 106x formed due to the relatively low height Hx of the pinning position Px. It rises and its film thickness becomes the thickness Tx.
On the other hand, as shown in FIG. 5D, when the ink 1060y is dried, the height Hy of the pinning position Py is relatively high, so that the organic light emitting layer 106y formed has the center of the subpixel. The portion is dented, and the film thickness becomes the thickness Ty.
The thickness Tx and the thickness Ty satisfy the following relationship.
[Number 6] Tx> Ty The above relationships are summarized in FIG. As shown in FIG. 6, if the inclination angle (taper angle) θ on the surface portion of the bank 105 is reduced, the height H of the pinning position is lowered, and the film thickness T of the resulting organic light emitting layer 106 is thickened. .. On the contrary, if the inclination angle (taper angle) θ on the surface portion of the bank 105 is increased, the height H of the pinning position becomes higher, and the film thickness T of the resulting organic light emitting layer 106 becomes thinner.
Five samples were prepared and evaluated for the above items. The results are shown in FIGS. 7 and 8.
As shown in FIGS. 7 and 8, the pinning position is higher in the samples 3 and 4 in which the taper angle is increased with respect to the film thickness distribution of the sample 2. In FIGS. 7 and 8, the horizontal axis indicates the horizontal direction and the vertical axis indicates the height direction.
However, in the sample 5 in which the taper angle (inclination angle) on the surface portion of the bank was increased to 50 [°], the uniformity of the film thickness was lower than that in the sample 2.
6. Manufacturing method of display panel 10 A characteristic portion of the display panel 10 manufacturing method according to the present embodiment will be described with reference to FIGS. 9, 10 and 11. As the manufacturing process for which the description is omitted below, various processes proposed as the prior art can be adopted.
First, as shown in FIG. 9A, the anode electrode 102 and the electrode coating layer 103 are sequentially laminated and formed on the upper surface of the substrate 101 in the Z-axis direction corresponding to the planned sub-pixel regions 1000a, 1000b, and 1000c. .. Then, the hole injection transport layer 104 is laminated and formed from above so as to cover the entire surface. The anode electrode 102 is formed, for example, by forming a thin film made of Al or an alloy thereof using a sputtering method or a vacuum vapor deposition method, or an Ag thin film, and then patterning the thin film using a photolithography method.
Further, the electrode coating layer 103 is formed, for example, by forming an ITO thin film on the surface of the anode electrode 102 by a sputtering method or the like and patterning the ITO thin film by a photolithography method or the like. Then, in forming the hole injection transport layer 104, first, a metal film is formed on the surface of the substrate 101 including the surface of the electrode coating layer 103 by using a sputtering method or the like. After that, the formed metal film is oxidized to form the hole injection transport layer 104.
Next, as shown in FIG. 9B, for example, a spin coating method or the like is used to form the bank material layer 1050 so as to cover the hole injection transport layer 104. A photosensitive resist material may be used to form the bank material layer 1050, and specifically, as described above, an insulating organic material such as an acrylic resin, a polyimide resin, or a novolak-type phenol resin may be used. it can.
Next, as shown in FIG. 9C, a mask 501 having openings 501a, 501b, 501c, 501d provided at a location where a bank is to be formed is arranged above the bank material layer 1050. In this state, exposure is performed through the openings 501a, 501b, 501c, 501d of the mask 501.
As shown in FIG. 9C, the opening 501a of the mask 501 located on the left side with respect to the planned sub-pixel area 1000a has a width Wa of the surface portion 105aa of the bank 105a to be formed. It is defined by points Pa1 and Pa2 at the lower end of (see 4).
On the other hand, the opening 501c of the mask 501 located between the sub-pixel 1000b and the sub-pixel 1000c has the width Wc1 of the upper end point Pc1 and the surface portion 105cc of the surface portion 105cc (see FIG. 4) of the bank 105c to be formed. It is defined by a point Pc2 at the hem of (see FIG. 4).
Next, as shown in FIG. 10A, a mask 502 having an opening 502c is arranged above the bank material layer 1050 at a position corresponding to the surface portion 105cc (see FIG. 4) of the bank 105c. Then, in this state, the second exposure is performed through the opening 502c of the mask 502.
As shown in FIG. 10A, the width Wc2 of the opening 502c in the mask 502 is defined by the lower end point Pc3 and the upper end point Pc1 of the surface portion 105cc of the bank 105c to be formed.
Next, as shown in FIG. 10 (b), banks 105a, 105b, 105c, 105d are formed by developing and baking. As described above, the surface portion 105cc on the sub-pixel planned area 1000b side of the bank 105c is larger than the surface portions 105aa, 105ba, 105bb, 105dc of the banks 105a, 105b, 105d and the surface portion 105cc on the sub-pixel planned area 1000c side of the bank 105c. The tilt angle increases.
Then, as shown in FIG. 10C, the ink 1060a containing the organic light emitting material is applied to the opening (subpixel planned area 1000a) partitioned by the bank 105a and the bank 105b by using an inkjet method or the like.
Subsequently, as shown in FIG. 11A, the ink 1060b containing the organic light emitting material is applied to the opening (subpixel planned area 1000b) partitioned by the bank 105b and the bank 105c by the same inkjet method or the like. To do. Here, as described above, since the inclination angle of the surface portion 105cc in the bank 105c is made larger than the inclination angle of the other surface portion, the pinning position Qcc of the ink 1060b with respect to the surface portion 105cc of the bank 105c is the other pinning position. The position is higher than Qaa, Qba, and Qbb.
Then, as shown in FIG. 11B, the ink 1060c containing the organic light emitting material is applied to the opening (subpixel planned area 1000c) partitioned by the bank 105c and the bank 105d by the same inkjet method or the like. .. Here, since the ink is already applied to the sub-pixel scheduled area in the adjacent pixel portion in the sub-pixel planned area adjacent to the right side of the bank 105d, the ink 1060c is applied to both sides in the X-axis direction. There is no difference in the vapor concentration, and even if the inclination angle of the surface portion of the bank is not adjusted, the film thickness of the organic light emitting layer is not biased. This is clear from the above.
Although not shown, the display panel 10 is formed by drying the ink and then laminating the electron injection layer 107, the cathode electrode 108, the sealing layer 109, and the like in this order. ..
7. Ink application process and drying process The relationship between the ink application process and the drying process will be described with reference to FIG.
As shown in FIG. 12A, in the present embodiment, red ink (ink 1060a) is applied (step S1), then green ink (ink 1060b) is applied (step S2), and blue ink (ink). After applying 1060c) (step S3), it was decided to collectively execute the ink drying step (step S4).
On the other hand, as shown in FIG. 12B, the application of the red ink (ink 1060a) (step S11) and the drying thereof (step S12) are executed, and then the green ink (ink 1060b) is applied. (Step S21) and its drying (step S22) may be executed, and blue ink (ink 1060c) may be applied (step S31) and its drying (step S32) may be executed in sequence. Also in this case, the relationship between the inclination angles of the surface portions 105aa, 105ba, 105bb, 105cc, 105cc, and 105dc of the banks 105a, 105b, 105c, and 105d can be the same as described above. Also in this case, it is possible to suppress the unevenness of the film thickness of the formed organic light emitting layer 106.
8. effect As shown in FIG. 4, in the display panel 10 of the display device 1 according to the present embodiment, the inclination angle θcc of the surface portion 105cc on the sub-pixel 100c side in the bank 105c is different from the other surface portions 105aa, 105ba, 105bb, 105cc, 105dc. Each inclination angle θaa, θba, θbb, θcc, θdc is set large. Therefore, as shown in FIG. 11A, when the ink 1060b is applied to the sub-pixel scheduled area 1000b, the pinning position Qcb becomes higher than the other pinning positions Qaa, Qba, and Qbb.
On the contrary, the inclination angles θaa, θba, θbb, θcc, and θdc of the surface portions 105aa, 105ba, 105bb, 105cc, and 105dc are equal to each other.
Therefore, the display panel 10 has the effect that the film thickness of the organic light emitting layer 106 after drying becomes uniform in the sub-pixels 100a, 100b, and 100c, and the brightness unevenness is small.
By using the method for manufacturing the display device 1 according to the present embodiment described with reference to FIGS. 9, 10 and 11, it is possible to manufacture the display device 1 having the above effect.
Further, as described above, "equal" does not mean that they are completely equal in terms of numerical values, but takes into consideration dimensional errors in the manufacture of the display device 1. Specifically, it means that in the display panel 10, the inclination angles are made equal within a range in which the difference in luminous efficiency (luminance unevenness) of the sub-pixels 100a, 100b, and 100c belonging to each of them is practically acceptable.
[Modification 1] Next, a modification 1 of the manufacturing method of the display device 1 will be described with reference to FIG. FIG. 13 shows a process corresponding to the process shown in FIGS. 9 (c) to 10 (a).
As shown in FIG. 13, after the bank material layer 1050 is laminated and formed on the hole injection transport layer 104, the mask 503 is arranged above the bank material layer 1050. The mask 503 is provided with light transmitting portions 503a, 503b, 503c1, 503c2, 503d. The light transmitting portions 503a, 503b, 503c1, 503c2, 503d are provided corresponding to the locations where the banks 105a, 105b, 105c, 105d are to be formed.
In the manufacturing method of the display device 1 according to the first modification, the width Wa of the light transmitting portion 503a in the region corresponding to the left side of the planned sub-pixel region 1000a is the surface portion 105aa of the bank 105a to be formed, ... (FIG. 4). ) Is defined by points Pa1 and Pa2 at the lower end.
On the other hand, the width Wc2 of the light transmitting portion 503c1 in the region corresponding to the sub-pixel 1000b and the sub-pixel 1000c is determined by the lower end point Pc2 and the upper end point Pc1 of the bank 105c (see FIG. 4) to be formed. It is stipulated. Further, the light transmitting portion 503c2 is defined by points Pc3 and Pc1 at the upper and lower ends of the surface portion 105cc (see FIG. 4) of the bank 105c to be formed.
Here, the mask 503 is configured by using a mask such as a halftone, and the light transmittances of the light transmitting portions 503a, 503b, 503c1, 503d and the light transmitting portion 503c2 are different. Specifically, the light transmittance of the light transmitting portion 503c2 is larger than the light transmittance of the light transmitting portions 503a, 503b, 503c1, 503d.
Banks 105a, 105b, 105c, 105d as shown in FIG. 10B are formed by performing exposure / development and then baking with the mask 503 having the above configuration arranged. Can be done. That is, in the portion exposed through the light transmitting portion 503c2 in which the light transmittance is set to be large, the relationship shown in the above [Equation 1] is higher than the portion exposed through the other light transmitting portions 503a, 503b, 503c1, 503d. As shown above, the inclination angle of the side wall surface becomes large.
The subsequent steps are the same as those in the above-described embodiment.
The display device 1 can also be manufactured by the above manufacturing method.
[Modification 2] Next, a modification 2 of the manufacturing method of the display device 1 will be described with reference to FIGS. 14 and 15. 14 and 15 show steps corresponding to the steps shown in FIGS. 9 (c) to 10 (b).
As shown in FIG. 14A, after the bank material layer 1050 is laminated and formed on the hole injection transport layer 104, the mask 504 is arranged above the bank material layer 1050. The mask 504 is provided with openings 504a, 504c, and 504d corresponding to the locations where the bank 105 is to be formed.
The openings 504a, 504b, and 504d are formed with the same width as the openings 501a of the mask 501 used in the manufacturing method of the above embodiment.
On the other hand, the width Wc3 of the opening 504c provided at the position where the bank 105c (see FIG. 4) to be formed between the sub-pixel scheduled area 1000b and the sub-pixel planned area 1000c is to be formed is shown in FIG. As shown in the portion surrounded by the alternate long and short dash line in a), the width is set to be larger than the width defined by the upper and lower end points Pc2 and Pc3 of the surface portion 105cc (see FIG. 4) of the bank 105c. .. Specifically, the width is increased at the place where the inclination angle is to be increased.
The first exposure / development is performed with the mask 504 in the form shown in FIG. 14A arranged. As a result, as shown in FIG. 14B, the bank material layers 1051a, 1051b, 1051c, 1051d remain at the locations corresponding to the openings 504a, 504b, 504c, and 504d, respectively.
As shown in FIG. 14B, in the state where the first exposure / development is performed, the inclination angles of the respective surface portions of the bank material layers 1051a, 1051b, 1051c, and 1051d are uniform. Further, in the present modification 2, the baking at this point is not performed.
As shown in FIG. 15A, the mask 505 is arranged above the bank material layers 1051a, 1051b, 1051c, and 1051d in a state where the bank material layers 1051a, 1051b, 1051c, and 1051d are formed. The mask 505 is provided with an opening 505c only in a portion corresponding to a surface portion of the banks 105a, 105b, 105c, 105d to be formed and a portion (surface portion 105cc of the bank 105c) for which an inclination angle is to be increased. ..
Banks 105a, 105b, 105c, 105d as shown in FIG. 15B can be formed by baking after performing the second exposure / development with the mask 505 arranged.
After that, the display device 1 can be manufactured by executing the same steps as those in the above embodiment.
[Verification of manufacturing method] For each of the above-described embodiments and the manufacturing methods according to the modified examples 1 and 2, the bank shape after formation was verified by a specific example. The result will be described with reference to FIG.
As shown in FIG. 16A, as the exposure amount is increased, the inclination angle of the formed bank side surface portion becomes larger. Specifically, the inclination angle of the side surface of the bank formed when exposed and developed with an exposure amount of 200 [mJ] is 23 [°], whereas the exposure amount is 300 [mJ]. -The inclination angle of the side surface of the bank formed when developed is 38 [°]. This result is also shown in AFM (Atomic Force Microscope) shown in FIG. 16 (b).
Further, as shown in FIGS. 16A and 16B, after performing the first exposure / development with an exposure amount of 200 [mJ], the second exposure / development with an exposure amount of 100 [mJ]. When developed, the inclination angle of the formed bank side surface portion is 50 [°]. This corresponds to the manufacturing method according to the above-mentioned modification 2, and is considered to be effective in increasing the inclination angle of the bank side surface portion.
In FIG. 16B, the horizontal axis indicates the horizontal direction and the vertical axis indicates the height direction.
[Embodiment 2] The configuration of the display device according to the second embodiment will be described with reference to FIGS. 17 and 18.
1. 1. Configuration of display panel 30 As shown in FIG. 17, the display panel 30 has sub-pixels 300a and 300b on the TFT substrate (hereinafter, simply referred to as board) 101, similarly to the display panel 10 according to the first embodiment. The anode electrode 102 is formed corresponding to each of the, 300c, and the electrode coating layer 103 and the hole injection transport layer 104 are laminated and formed in this order on the anode electrode 102.
On the hole injection transport layer 104, banks 305a, 305b, 305c, 305d, which are made of an insulating material and define sub-pixels 300a, 300b, 300c, respectively, are erected. The organic light emitting layer, the electron injection layer, the cathode electrode, and the sealing layer are laminated and formed in this order in the region divided by the banks 305a, 305b, 305c, 305d in each of the subpixels 300a, 300b, 300c. (In FIG. 17, the illustration is omitted).
The display panel 30 according to the present embodiment is the same as the display panel 10 according to the first embodiment in that one pixel portion is composed of a combination of sub-pixels 300a, 300b, and 300c. However, in the display panel 30 according to the present embodiment, non-pixel portions 300d and 300e are provided between the adjacent pixel portions.
Specifically, as shown in FIG. 17, in the non-pixel portions 300d and 300e, an electrode (bus bar) 302 made of the same material as the anode electrode 102 and an electrode coating layer 303 covering the electrode (bus bar) 302 are provided. .. A hole injection transport layer 104 extends above the electrode coating layer 303, and although not shown, a cathode electrode 108 is formed on the hole injection transport layer 104, and the electrodes 302 and the cathode electrode 108 are electrically charged. Is connected. The organic light emitting layer 106 is not formed in the non-pixel portions 300d and 300e. By adopting such a configuration, it is possible to reduce the electric resistance of the cathode electrode 108 made of ITO or the like, and it is possible to suppress the voltage drop.
As shown in FIG. 17, in the display panel 30 according to the present embodiment, the surface portions 305aa, 305ba, 305bb, 305cc, 305cc, 305dc of the banks 305a, 305b, 305c, 305d and the hole injection transport layer which is the base layer are formed. The surfaces of 104 form angles θ3aa, θ3ba, θ3bb, θ3cc, θ3cc, and θ3dc, respectively.
Here, in the present embodiment, the angles θ3aa, θ3ba, θ3bb, θ3cc, θ3cc, and θ3dc satisfy the relationships shown by the following equations.
[Equation 7] θ3cc> θ3aa = θ3ba = θ3bb = θ3cc [Equation 8] θ3dc> θ3aa = θ3ba = θ3bb = θ3cc In the present embodiment, it is desirable to set the respective angles θ3aa, θ3ba, θ3bb, θ3cc, θ3cc, and θ3dc in the following ranges.
[Equation 9] 25 [°] <θ3aa = θ3ba = θ3bb = θ3cc <35 [°] [Number 10] 35 [°] <θ3cc <45 [°] [Number 11] 35 [°] <θ3dc <45 [°] In relation to the above [Equation 7], [Equation 8], [Equation 9], [Equation 10], and [Equation 11], the respective surface portions 305aa, 305ba, 305bb, 305cc, 305cc of the banks 305a, 305b, 305c, 305d, The inclination angles θ3aa, θ3ba, θ3bb, θ3cc, θ3cc, and θ3dc of 305dc are defined by arranging the non-pixel portions 300d and 300e between the adjacent pixel portions. This will be described below with reference to the application of the inks 3060a, 3060b, and 3060c.
2. 2. Manufacturing method of display panel 30 The manufacturing method of the display panel 30 will be described with reference to FIG. 18 by extracting a characteristic process. The steps other than the steps shown in FIG. 18 are the same as those in the first embodiment.
As shown in FIG. 18A, the ink 3060a containing the organic light emitting material is applied to the opening (sub-pixel planned area 3000a) partitioned by the bank 305a and the bank 305b by using an inkjet method or the like. When the ink 3060a is applied, the ink is not applied to the left side of the bank 305a and the right side of the bank 305b, so that the distribution of the vapor concentration is substantially uniform.
Subsequently, as shown in FIG. 18B, the ink 3060b containing the organic light emitting material is applied to the opening (subpixel planned area 3000b) partitioned by the bank 305b and the bank 305c by the same inkjet method or the like. To do. Here, as described above, the inclination angle θ3cc (see FIG. 17) of the surface portion 305cc in the bank 305c is set so as to satisfy the relationship of the above [Equation 7] (relatively large). Therefore, the pinning position Q3cc of the ink 3060b with respect to the surface portion 305cc of the bank 305c is higher than the other pinning positions Q3aa, Q3ba, and Q3bb.
Then, as shown in FIG. 18C, the ink 3060c containing the organic light emitting material is applied to the opening (subpixel planned area 3000c) partitioned by the bank 305c and the bank 305d by the same inkjet method or the like. .. Here, in the present embodiment, since the non-pixel portion 3000d in which the ink is not applied exists on the right side of the sub-pixel scheduled area 3000c, the vapor concentration on the right side of the sub-pixel 3000c is lower than that on the left side. Therefore, for the bank 305d as well, the inclination angle θ3dc (see FIG. 17) of the surface portion 305dc on the subpixel planned area 3000c side is set to the inclination angle θ3cd of the surface portion 305cc of the bank 305c, as in the above [Equation 7], [ The relationship of [Equation 8] is satisfied (relatively large). As a result, the pinning position Q3dc of the ink 3060c with respect to the surface portion 305dc of the bank 305d is also higher than the pinning position Q3cc of the ink 3060b.
Although not shown, the display panel 30 is formed by drying the ink and then laminating the electron injection layer, the cathode electrode, the sealing layer, and the like in this order.
By adopting the above configuration, even when the non-pixel portions 300d and 300e are provided between the adjacent pixel portions, the organic light emitting layer in all the sub-pixels 300a, 300b and 300c The unevenness of the film thickness can be suppressed, and the display panel 30 having high light emission characteristics can be obtained.
It should be noted that the same configuration as that of the first embodiment can be adopted for the matters for which the description is omitted in the present embodiment.
[Other matters] First, in the first and second embodiments and the first and second embodiments, it is schematically shown that each surface portion of the banks 105, 105a to 105d, 105x, 105y, 305a to 305e is a flat surface. Does not necessarily have to be flat. For example, as shown in FIG. 19A, in the case of bank 605, point P<sub>61</sub>From point P<sub>62</sub>The surface between and point P<sub>62</sub>From point P<sub>63</sub>The planes up to will intersect. In this case, the pinning position Qy1 at the time of ink application is the point P.<sub>62</sub>From point P<sub>63</sub>It exists in the aspect between. And point P<sub>62</sub>Virtual straight line L passing through<sub>1</sub>The inclination angle θy2 of the surface portion formed when is pulled is important in relation to the pinning position.
However, in the formation of the bank 605, the hole injection transport layer 104, which is the base layer, and the point P of the bank 605<sub>61</sub>From point P<sub>62</sub>By controlling the angle θy1 formed by the surface between the two, the angle θy2 is also controlled. Therefore, by substantially controlling the inclination angle θy1, the above effect can be obtained. Is. That is, with respect to the angle θy1 shown in FIG. 19A, the point P<sub>71</sub>From point P<sub>72</sub>When a bank 705 having a large angle θy11 is formed (FIG. 19 (b)), the point P is shown in FIG. 19 (b).<sub>72</sub>From point P<sub>73</sub>The surface between the two is a virtual straight line L<sub>2</sub>The angle θy12 formed with respect to the angle θy12 also increases with respect to the angle θy2 in FIG. 19A.
Next, in the first and second embodiments and the first and second embodiments, the application area of the above configuration on the display panels 10 and 30 is not limited, but the above configuration is applied to the entire area of the display panel. It is also possible to apply the above configuration to a limited area. As shown in FIG. 20, the display panel 10 can be formally divided into a region 10a arranged in the central portion and a region 10b arranged in the periphery thereof in the direction along the surface thereof. Here, the region 10a is a region in which the anode electrode is connected to the source electrode or the drain electrode of the TFT layer formed below the anode electrode and contributes to light emission, whereas in the region 10b, the anode electrode is below the source electrode. This is a region that is not connected to either the source electrode or the rain electrode of the TFT layer formed in the above and does not contribute to light emission. When the region 10a is further divided into a central region 10a1 and a peripheral region 10a2 in a formation period, the film thickness of the organic light emitting layer in the subpixel in the peripheral region 10a2 is determined from the distribution state of the vapor concentration at the time of ink application. It is considered that the bias occurs more prominently.
The combined region of the peripheral region 10a2 and the region 10b may be a pixel portion of about 0.5 [%] to several [%] (for example, 1 [%]) of the outer peripheral portion of the panel. This is due to consideration of the variation in the film thickness of the organic light emitting layer when the inclination angle on the surface portion of the bank is not adjusted.
In the first and second embodiments and the first and second embodiments, each configuration as an example is adopted in order to explain the configuration and the action / effect of the present invention in an easy-to-understand manner. Except for, the present invention is not limited to the above-mentioned form. For example, in the above embodiment, as shown in FIG. 2, a configuration in which the anode electrode 102 is arranged on the lower side of the organic light emitting layer 106 in the Z-axis direction is adopted as an example, but the present invention has this. However, it is also possible to adopt a configuration in which the cathode electrode 108 is arranged on the lower side of the organic light emitting layer 106 in the Z-axis direction.
When the cathode electrode 108 is arranged on the lower side of the organic light emitting layer 106 in the Z-axis direction, the cathode electrode 108 has a top emission structure. Therefore, the cathode electrode 108 is used as a reflective electrode layer, and the electrode coating layer 103 is placed on the cathode electrode 108. Will be adopted.
Further, in the above-described first and second embodiments, the specific appearance shape of the display device 1 is not shown, but it can be a part of the system as shown in FIG. 21, for example. Since the organic EL display device does not require a backlight like a liquid crystal display device, it is suitable for thinning and exhibits excellent characteristics from the viewpoint of system design.
Further, in the first and second embodiments and the first and second embodiments, the so-called line banks as shown in FIG. 3 are the forms of the banks 105, 105a to 105d, 105x, 105y, 305a to 305e, 605,705. Although the structure is adopted, the display panel 80 may be configured by adopting the pixel bank 805 including the bank element 805a extending in the Y-axis direction and the bank element 805b extending in the X-axis direction as shown in FIG. it can.
As shown in FIG. 22, when the pixel bank 805 is adopted, the inclination of the side wall portion on the outer side in the X-axis direction and the Y-axis direction with respect to the bank 805 defining each sub-pixel 800a, 800b, 800c. By increasing the angle, the same effect as described above can be obtained. Specifically, arrow B<sub>1</sub>, B<sub>2</sub>, B<sub>3</sub>, B<sub>4</sub>The above effect can be obtained by appropriately adjusting the inclination angle of the surface portion indicated by.
Further, the adjustment of the inclination angle of the surface portion of the bank adopted in the first and second embodiments and the first and second embodiments is applied to the vapor concentration distribution in the ink coating step and the drying step related to the formation of the organic light emitting layer at the time of manufacturing. It can be changed as appropriate according to the individual. For example, in the structure of a drying device, when the flow of steam during drying of ink is in the direction from the outer peripheral portion of the panel to the central portion of the panel, it corresponds to a place where the film thickness of the organic light emitting layer becomes thick. Then, the inclination angle of the side surface of the bank may be increased. As a result, the film thickness of the organic light emitting layer can be made uniform, and uneven brightness in the entire panel can be reduced.
Further, in the first and second embodiments and the first and second embodiments, there is no distinction in setting the inclination angle on the surface portion of the bank for each emission color (red, green, blue), but organic emission is performed according to the emission color. Since it is conceivable that the characteristics of the ink containing the material will change, in this case, the inclination angle of the surface portion of the corresponding bank can be defined according to the ink characteristics of each emission color.
INDUSTRIAL APPLICABILITY The present invention is useful for realizing an organic light emitting panel and an organic display device having low brightness unevenness and high image quality performance.
1. 1. Display device 10, 30, 80. Display panel 10a1. Luminous central region 10a2. Light emission peripheral area 10b. Dummy area 20. Drive control unit 21-24. Drive circuit 25. Control circuit 100, 100a to 100c, 300a to 300c. Subpixel 101. substrate 102. Anode electrode 103. Electrode coating layer 104. Hole injection layer 105, 105a to 105d, 105x, 105y, 305a to 305e, 605,705,805. bank 106, 106a, 106c, 106x, 106y. Organic light emitting layer 107. Electron injection layer 108. Cathode electrode 109. Sealing layer 300d, 300e. Non-pixel part 501-505. mask 1000a-1000c, 3000a-3000c. Subpixel planned area 1050, 1051a, 1051b, 1051e, 1051f. Bank material layer 1060a-1060c, 1060x, 1060y, 3060a-3060c. ink 3000d, 3000e. Non-pixel planned area
24 sheets
Sheet 1 Sheet 2 Sheet 3 Sheet 4 Sheet 5 Sheet 6 Sheet 7 Sheet 8 Sheet 9 Sheet 10 Sheet 11 Sheet 12 Sheet 13 Sheet 14 Sheet 15 Sheet 16 Sheet 17 Sheet 18 Sheet 19 Sheet 20 Sheet 21 Sheet 22 Sheet 23 Sheet 24
Every citation, both ways
| Document | Relation | Office | Cited during |
|---|---|---|---|
| JP2002222695A | Cites | Japan | Examiner |
| JP2007310156A | Cites | Japan | Examiner |
| JP2009277578A | Cites | Japan | Examiner |
| JP2009277578A | Cites | Japan | – |
| JP2007310156A | Cites | Japan | – |
| JP2002222695A | Cites | Japan | – |
7 members in 4 offices
Priority claims4
| Document | Office | Kind | Date |
|---|---|---|---|
| 2010006125 | Japan | W | |
| 2010006125 | Japan | W | |
| JP2010006125 | – | – | – |
| WO2010JP06125 | – | – | – |
Members7
| Document | Office | Kind | |
|---|---|---|---|
| WO2012049712A1 | World Intellectual Property Organization (WIPO) | A1 | |
| CN102960067A | China | A | |
| US2013126839A1 | United States of America | A1 | |
| JPWO2012049712A1 | Japan | A1 | |
| US8901546B2 | United States of America | B2 | |
| JP5677448B2This record | Japan | B2 | |
| CN102960067B | China | B |
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Numbers
- Publication
- 5677448
- Publication, DOCDB
- 5677448
- Publication, EPODOC
- JP5677448B
- Application
- 2012538479
- Application, DOCDB
- 2012538479
- Application, EPODOC
- JP20120538479
Titles2
- Japanese
- 有機発光パネルとその製造方法、および有機表示装置
- English
- Organic light emitting panel and its manufacturing method, and organic display device
Classification
- CPC, 6
- H10K59/122
- H10K71/135
- H10K71/40
- H10K50/00
- H10K71/00
- H10H20/813
- IPC, 7
- H05B33 22
- H01L51 50
- H05B33 12
- H05B33 10
- G09F9 30
- H01L27 32
- H10K99 00
