Display device
4 claims: 4 independent, 0 dependent
- 1Has a first substrate,Has a second substrate,A first transistor is provided between the first substrate and the second substrate.A second transistor is provided between the first substrate and the second substrate.A first light emitting element is provided between the first substrate and the second substrate.A second light emitting element is provided between the first substrate and the second substrate.The first light emitting element has a function of being able to emit the first light.The second light emitting element has a function of being able to emit a second light.The first light can pass through the first substrate andThe second light can pass through the second substrate andOne of the source and drain of the first transistor is electrically connected to the first light emitting element.One of the source and drain of the second transistor is electrically connected to the second light emitting element.The first transistor has a first channel length andThe first transistor has a first channel width andThe second transistor has a second channel length andThe second transistor has a second channel width andA first value obtained by dividing the value of the first channel width by the value of the first channel length, and a second value obtained by dividing the value of the second channel width by the value of the second channel length. And, a display device characterized by being different. 第1の基板を有し、第2の基板を有し、前記第1の基板と前記第2の基板の間に、第1のトランジスタを有し、前記第1の基板と前記第2の基板の間に、第2のトランジスタを有し、前記第1の基板と前記第2の基板の間に、第1の発光素子を有し、前記第1の基板と前記第2の基板の間に、第2の発光素子を有し、前記第1の発光素子は、第1の光を発することができる機能を有し、前記第2の発光素子は、第2の光を発することができる機能を有し、前記第1の光は前記第1の基板を透過することができ、前記第2の光は前記第2の基板を透過することができ、前記第1のトランジスタのソース又はドレインの一方は、前記第1の発光素子と電気的に接続されており、前記第2のトランジスタのソース又はドレインの一方は、前記第2の発光素子と電気的に接続されており、前記第1のトランジスタは、第1のチャネル長を有し、前記第1のトランジスタは、第1のチャネル幅を有し、前記第2のトランジスタは、第2のチャネル長を有し、前記第2のトランジスタは、第2のチャネル幅を有し、前記第1のチャネル幅の値を前記第1のチャネル長の値で割った第1の値と、前記第2のチャネル幅の値を前記第2のチャネル長の値で割った第2の値と、が異なることを特徴とする表示装置。
- 2It has a first transistor above the first plastic,It has a second transistor above the first plastic andIt has a first conductive layer above the first transistor and has a first conductive layer.It has a second conductive layer above the second transistor and has a second conductive layer.It has an EL layer above the first conductive layer and above the second conductive layer.It has a third conductive layer above the EL layer and has a third conductive layer.It has a fourth conductive layer above the third conductive layer and has a fourth conductive layer.It has a second plastic above the fourth conductive layer andThe first plastic has a color andThe second plastic has a colorThe first conductive layer has a first material and has.The second conductive layer has a second material and has a second material.The third conductive layer has a third material and has a third material.The fourth conductive layer has a fourth material and has a fourth material.The first material has a property of being able to reflect light and has a property of being able to reflect light.The second material has a property of being able to transmit light and has a property of being able to transmit light.The third material has the property of being able to reflect light.The fourth material has the property of being able to transmit light.The EL layer has a first region that overlaps with the first conductive layer.The EL layer has a second region that overlaps with the second conductive layer.The third conductive layer has a third region that overlaps with the first conductive layer.The third conductive layer has a fourth region that overlaps with the first conductive layer.The fourth conductive layer has a fifth region that overlaps with the second conductive layer.One of the source and drain of the first transistor is electrically connected to the first conductive layer.One of the source and drain of the second transistor is electrically connected to the second conductive layer.The first transistor has a first channel length andThe first transistor has a first channel width andThe second transistor has a second channel length andThe second transistor has a second channel width andA first value obtained by dividing the value of the first channel width by the value of the first channel length, and a second value obtained by dividing the value of the second channel width by the value of the second channel length. And, a display device characterized by being different. 第1のプラスチックよりも上方に第1のトランジスタを有し、前記第1のプラスチックよりも上方に第2のトランジスタを有し、前記第1のトランジスタよりも上方に第1の導電層を有し、前記第2のトランジスタよりも上方に第2の導電層を有し、前記第1の導電層よりも上方及び前記第2の導電層よりも上方にEL層を有し、前記EL層よりも上方に第3の導電層を有し、前記第3の導電層よりも上方に第4の導電層を有し、前記第4の導電層よりも上方に第2のプラスチックを有し、前記第1のプラスチックは色を有し、前記第2のプラスチックは色を有し、前記第1の導電層は、第1の材料を有し、前記第2の導電層は、第2の材料を有し、前記第3の導電層は、第3の材料を有し、前記第4の導電層は、第4の材料を有し、前記第1の材料は、光を反射することができる性質を有し、前記第2の材料は、光を透過することができる性質を有し、前記第3の材料は、光を反射することができる性質を有し、前記第4の材料は、光を透過することができる性質を有し、前記EL層は、前記第1の導電層と重なる第1の領域を有し、前記EL層は、前記第2の導電層と重なる第2の領域を有し、前記第3の導電層は、前記第1の導電層と重なる第3の領域を有し、前記第3の導電層は、前記第1の導電層と重なる第4の領域を有し、前記第4の導電層は、前記第2の導電層と重なる第5の領域を有し、前記第1のトランジスタのソース又はドレインの一方は、前記第1の導電層と電気的に接続されており、前記第2のトランジスタのソース又はドレインの一方は、前記第2の導電層と電気的に接続されており、前記第1のトランジスタは、第1のチャネル長を有し、前記第1のトランジスタは、第1のチャネル幅を有し、前記第2のトランジスタは、第2のチャネル長を有し、前記第2のトランジスタは、第2のチャネル幅を有し、前記第1のチャネル幅の値を前記第1のチャネル長の値で割った第1の値と、前記第2のチャネル幅の値を前記第2のチャネル長の値で割った第2の値と、が異なることを特徴とする表示装置。
Independent claims2
71 paragraphs, as filed
The present invention relates to a display device provided with a light emitting element, particularly a portable information terminal such as a notebook personal computer (hereinafter referred to as a notebook PC).
In recent years, as a light emitting device, research and development of a display device using a light emitting element represented by an electroluminescence (EL) element or the like has been promoted instead of a liquid crystal display (LCD) having pixels using a liquid crystal element. These light emitting devices are expected to be widely used as display screens and display devices for mobile phones by taking advantage of the advantages of high image quality, wide viewing angle, thinness and light weight because they do not require a backlight because of the light emitting type. There is.
<p> However, at present, there is a problem that the brightness deteriorates in terms of the reliability (life) of the EL material. Further, when performing multicolor display, there is a problem that the degree of luminance deterioration differs among the elements R, G, and B.</p><p> In addition, mobile information terminals such as notebook PCs are extremely thin and lightweight, and are easy to carry, so they are not suitable for use in relatively narrow places such as trains and automobiles, or while walking. Opportunities to use it in a stable state are increasing. In such an unstable state, it becomes difficult to open the lid of the notebook PC and operate the keys with both hands, so a portable information terminal that can be easily used even while moving is desired. It is rare.</p>
<p> The display device of the present invention has a display mounted on a double-sided display panel having a first display surface on one surface of the substrate and having a second display surface on the surface of the substrate opposite to the one surface of the substrate. The apparatus is characterized in that the emission brightness of the first display surface and the second display surface are different from each other.</p><p> The display device of the present invention is a display device equipped with a double-sided display panel having a first display surface on one surface of a substrate and a second display surface on the surface of the substrate opposite to the one surface. The double-sided display panel has a plurality of pixels, and each of the plurality of pixels contributes to the display of the first display surface and the display of the second display surface. It is characterized by having a second light emitting element, and having a means for making the light emitting brightness of the first light emitting element and the second light emitting element different from each other.</p><p> The display device of the present invention is a display device equipped with a double-sided display panel having a first display surface on one surface of a substrate and a second display surface on the surface of the substrate opposite to the one surface. The double-sided display panel has a plurality of pixels, and each of the plurality of pixels contributes to the display of the first display surface and the display of the second display surface. It is characterized by having a second light emitting element, and having a means for making the amount of current flowing through the first light emitting element and the second light emitting element different.</p><p> The display device of the present invention has a display mounted on a double-sided display panel having a first display surface on one surface of the substrate and having a second display surface on the surface of the substrate opposite to the one surface of the substrate. The apparatus is characterized in that the aperture ratios of the pixels of the first display surface and the second display surface are different from each other.</p><p> The display device of the present invention is a display device equipped with a double-sided display panel having a first display surface on one surface of a substrate and a second display surface on the surface of the substrate opposite to the one surface. The double-sided display panel has a plurality of pixels, and the plurality of pixels each contribute to the display of the first display surface and the display of the second display surface. The first light emitting element has a first pixel electrode, the second light emitting element has a second pixel electrode, and the first pixel electrode has a second light emitting element. The area is different from the area of the second pixel electrode.</p><p> The display device of the present invention is a display device equipped with a double-sided display panel having a first display surface on one surface of a substrate and a second display surface on the surface of the substrate opposite to the one surface. The double-sided display panel has a plurality of pixels, and the plurality of pixels each contribute to the display of the first display surface and the display of the second display surface. The first light emitting element has a first pixel electrode, the second light emitting element has a second pixel electrode, and the first display surface and the like. The area of the pixel electrode of the light emitting element that contributes to the display of the display surface of the second display surface that is used more frequently is the pixel electrode of the light emitting element that contributes to the display of the display surface that is used less frequently. It is characterized by being larger than the area of.</p><p> The display device of the present invention is a display device equipped with a double-sided display panel having a first display surface on one surface of a substrate and a second display surface on the surface of the substrate opposite to the one surface. The double-sided display panel has a plurality of pixels, and the plurality of pixels each contribute to the display of the first display surface and the display of the second display surface. The first light emitting element has a first pixel electrode, the second light emitting element has a second pixel electrode, and the first pixel electrode has a second light emitting element. The area and the area of the second pixel electrode are different, and it is characterized by having means for making the amount of current flowing through the first light emitting element and the second light emitting element different.</p><p> The display device of the present invention is a display device equipped with a double-sided display panel having a first display surface on one surface of a substrate and a second display surface on the surface of the substrate opposite to the one surface. The double-sided display panel has a plurality of pixels, and each of the plurality of pixels contributes to the display of the first display surface and the display of the second display surface. It has a second light emitting element, a first thin film transistor, and a second thin film transistor, the first light emitting element has a first pixel electrode, and the second light emitting element has a second pixel. Having electrodes, the first pixel electrode is electrically connected to the source or drain of the first thin film transistor, and the second pixel electrode is electrically connected to the source or drain of the second thin film transistor. It is characterized in that it is connected and the channel sizes of the first thin film transistor and the second thin film transistor are different.</p><p> The display device of the present invention is a display device equipped with a double-sided display panel having a first display surface on one surface of a substrate and a second display surface on the surface of the substrate opposite to the one surface. The double-sided display panel has a plurality of pixels, one of the first display surface and the second display surface is a multicolor display using a light emitting element of a plurality of colors, and the other is the above. It is a monochromatic display using the most reliable color light emitting element among the plurality of color light emitting elements, and among the plurality of pixels, the pixel having the most reliable light emitting element is each the first display. It has a first light emitting element that contributes to surface display and a second light emitting element that contributes to the display of the second display surface, and the light emitting brightness of the first light emitting element and the second light emitting element. It is characterized by having a means for differentiating.</p><p> The display device of the present invention is a display device equipped with a double-sided display panel having a first display surface on one surface of a substrate and a second display surface on the surface of the substrate opposite to the one surface. The double-sided display panel has a plurality of pixels, one of the first display surface and the second display surface is a multicolor display using a light emitting element of a plurality of colors, and the other is the above. It is a monochromatic display using the most reliable color light emitting element among the plurality of color light emitting elements, and among the plurality of pixels, the pixel having the most reliable light emitting element is each the first display. A current that has a first light emitting element that contributes to surface display and a second light emitting element that contributes to the display of the second display surface, and flows through the first light emitting element and the second light emitting element. It is characterized by having means for varying the amounts.</p><p> The display device of the present invention is a display device equipped with a double-sided display panel having a first display surface on one surface of a substrate and a second display surface on the surface of the substrate opposite to the one surface. The double-sided display panel has a plurality of pixels, one of the first display surface and the second display surface is a multicolor display using a light emitting element of a plurality of colors, and the other is the above. It is a monochromatic display using the most reliable color light emitting element among the plurality of color light emitting elements, and among the plurality of pixels, the pixel having the most reliable light emitting element is each the first display. It has a first light emitting element that contributes to the display of the surface and a second light emitting element that contributes to the display of the second display surface, and the first light emitting element has a first pixel electrode. The second light emitting element has a second pixel electrode, and is characterized in that the area of the first pixel electrode and the area of the second pixel electrode are different.</p><p> The display device of the present invention is a display device equipped with a double-sided display panel having a first display surface on one surface of a substrate and a second display surface on the surface of the substrate opposite to the one surface. The double-sided display panel has a plurality of pixels, and one of the first display surface and the second display surface is a multicolor display using a light emitting element of a plurality of colors, and the other is the above. It is a monochromatic display using the most reliable color light emitting element among the plurality of color light emitting elements, and among the plurality of pixels, the pixel having the most reliable light emitting element is each the first display. It has a first light emitting element that contributes to the display of the surface and a second light emitting element that contributes to the display of the second display surface, and the first light emitting element has a first pixel electrode. The second light emitting element has a second pixel electrode, and the pixel electrode of the light emitting element that contributes to the display of the more frequently used display surface of the first display surface and the second display surface. Is characterized in that the area of is larger than the area of the pixel electrode of the light emitting element that contributes to the display of the display surface that is used less frequently.</p><p> The display device of the present invention is a display device equipped with a double-sided display panel having a first display surface on one surface of a substrate and a second display surface on the surface of the substrate opposite to the one surface. The double-sided display panel has a plurality of pixels, and one of the first display surface and the second display surface is a multicolor display using a light emitting element of a plurality of colors, and the other is the above. It is a monochromatic display using the most reliable color light emitting element among the plurality of color light emitting elements, and among the plurality of pixels, the pixel having the most reliable light emitting element is each the first display. It has a first light emitting element that contributes to the display of the surface and a second light emitting element that contributes to the display of the second display surface, and the first light emitting element has a first pixel electrode. The second light emitting element has a second pixel electrode, and the area of the first pixel electrode and the area of the second pixel electrode are different, and the first light emitting element and the second light emitting element have different areas. It is characterized by having a means for making the amount of current to flow different.</p><p> The display device of the present invention is a display device equipped with a double-sided display panel having a first display surface on one surface of a substrate and a second display surface on the surface of the substrate opposite to the one surface. The double-sided display panel has a plurality of pixels, one of the first display surface and the second display surface is a multicolor display using a light emitting element of a plurality of colors, and the other is the above. It is a monochromatic display using the most reliable color light emitting element among the plurality of color light emitting elements, and among the plurality of pixels, the pixel having the most reliable light emitting element is each the first display. It has a first light emitting element that contributes to surface display, a second light emitting element that contributes to the display of the second display surface, a first thin film transistor, and a second thin film transistor. The light emitting element has a first pixel electrode, the second light emitting element has a second pixel electrode, and the first pixel electrode is electrically connected to the source or drain of the first thin film transistor. The second pixel electrode is electrically connected to the source or drain of the second thin film transistor, and the value of the channel width with respect to the channel length of the first thin film transistor and the second thin film transistor is different. It is said.</p><p> The display panel applicable to the present invention is a display panel having a plurality of pixels arranged in a matrix. Each of the plurality of pixels has two independent pixel electrodes.</p><p> The display device of the present invention is a display device equipped with a double-sided display panel having a first display surface on one surface of a substrate and a second display surface on the surface of the substrate opposite to the one surface. Therefore, one of the first display surface and the second display surface may be a multicolor display, and the other may be a single color display.</p><p> The display panel applicable to the present invention may use an electroluminescence element as a light emitting element.</p><p> Further, the display device of the present invention is a display device equipped with a double-sided display panel having a first display surface on one surface of a substrate and a second display surface on the surface of the substrate opposite to the one surface. One of the first display surface and the second display surface is a multicolor display using light emitting elements of a plurality of colors, and the other is the most reliable of the light emitting elements of the plurality of colors. It is characterized by a single color display using a high color light emitting element.</p><p> The display device of the present invention is a display device equipped with a double-sided display panel having a first display surface on one surface of a substrate and a second display surface on the surface of the substrate opposite to the one surface. The display device uses the monochromatic light emitting element, and is characterized in that it has a color filter on either one of the first display surface and the second display surface.</p><p> In the display device of the present invention, a colored plastic or a mirror surface type plastic may be provided on the display surface of the display panel.</p><p> Further, the display device of the present invention is a display device equipped with a double-sided display panel having a first display surface on one surface of a substrate and a second display surface on the surface of the substrate opposite to the one surface. It is characterized by having a touch panel function. The display method of the display device of the present invention has a first display surface on one surface of a substrate, and has a second display surface and a plurality of pixels on the surface of the substrate opposite to the one surface. Each of the plurality of pixels is equipped with a double-sided display panel having a first light emitting element that contributes to the display of the first display surface and a second light emitting element that contributes to the display of the second display surface. The display method of the display device is characterized in that the first light emitting element and the second light emitting element have different emission brightness.</p><p> The display method of the display device of the present invention has a first display surface on one surface of a substrate, and has a second display surface and a plurality of pixels on the surface of the substrate opposite to the one surface. Each of the plurality of pixels is equipped with a double-sided display panel having a first light emitting element that contributes to the display of the first display surface and a second light emitting element that contributes to the display of the second display surface. Of the first display surface and the second display surface, the light emitting brightness of the light emitting element of the display surface that is used more frequently is the display surface that is used less frequently. It is characterized in that it is made smaller than the emission brightness of the light emitting element of.</p><p> The display method of the display device of the present invention has a first display surface on one surface of a substrate, and has a second display surface and a plurality of pixels on the surface of the substrate opposite to the one surface. Each of the plurality of pixels is equipped with a double-sided display panel having a first light emitting element that contributes to the display of the first display surface and a second light emitting element that contributes to the display of the second display surface. The display method of the display device is characterized in that the amount of current flowing through the first light emitting element and the amount of current flowing through the second light emitting element are different from each other.</p><p> The display method of the display device of the present invention has a first display surface on one surface of a substrate, and has a second display surface and a plurality of pixels on the surface of the substrate opposite to the one surface. Each of the plurality of pixels is equipped with a double-sided display panel having a first light emitting element that contributes to the display of the first display surface and a second light emitting element that contributes to the display of the second display surface. In the display method of the display device, the amount of current flowing through the light emitting element that contributes to the display of the display surface having the higher frequency of use among the first display surface and the second display surface is the frequency of use. It is characterized in that it is made smaller than the amount of current flowing through the light emitting element that contributes to the display on the low display surface.</p><p> The display method of the display device of the present invention has a first display surface on one surface of a substrate, and has a second display surface and a plurality of pixels on the surface of the substrate opposite to the one surface. Each of the plurality of pixels has a first light emitting element that contributes to the display of the first display surface and a second light emitting element that contributes to the display of the second display surface. The light emitting element has a first pixel electrode, the second light emitting element has a second pixel electrode, and a double-sided display in which the area of the first pixel electrode and the area of the second pixel electrode are different. It is a display method of a display device equipped with a panel, and is characterized in that the amount of current flowing through the first light emitting element and the amount of current flowing through the second light emitting element are different from each other.</p><p> The display method of the display device of the present invention has a first display surface on one surface of a substrate, and has a second display surface and a plurality of pixels on the surface of the substrate opposite to the one surface. Each of the plurality of pixels has a first light emitting element that contributes to the display of the first display surface and a second light emitting element that contributes to the display of the second display surface. The light emitting element has a first pixel electrode, and the second light emitting element has a second pixel electrode, whichever of the first display surface and the second display surface is used more frequently. A display device equipped with a double-sided display panel in which the area of the pixel electrodes of the light emitting element that contributes to the display of the display surface is larger than the area of the pixel electrodes of the light emitting element that contributes to the display of the less frequently used display surface. In the display method, of the first display surface and the second display surface, the amount of current flowing through the light emitting element that contributes to the display of the more frequently used display surface is the less frequently used display surface. It is characterized in that it is made smaller than the amount of current flowing through the light emitting element that contributes to the display of.</p>
<p> According to the present invention, in a mobile information terminal such as a notebook PC, a double-sided display panel having a first display surface on the front surface and a second display surface on the back surface is used as a lid of the mobile information terminal such as the notebook PC. Depending on the difference in usage between the first display surface and the second display surface, the aperture ratio and emission brightness may differ from each other, or one of the first display surface and the second display surface may be multicolored. By making the other color monochromatic, it is possible to provide a portable information terminal that realizes a long life of the entire EL element and low power consumption. In addition, by using a double-sided display panel for the lid of a mobile information terminal such as a notebook PC and installing a touch panel function, it can be easily operated even with the lid of the mobile terminal such as a PC closed, so it can be moved. It can be easily used inside.</p>
<figref num="1">It is a figure which shows the mobile information terminal which provided the double-sided display panel in the lid part.</figref><figref num="2">It is a figure which shows the one pixel structure of this invention.</figref><figref num="3">It is a figure which shows the one pixel structure of this invention.</figref><figref num="4">It is a figure which shows the one pixel structure of this invention.</figref><figref num="5">It is a figure which shows the cross section of the one pixel structure of this invention.</figref><figref num="6">It is a figure which shows the cross section of the one pixel structure of this invention.</figref><figref num="7">It is a figure which shows the cross section of the one pixel structure of this invention.</figref><figref num="8">It is a figure which combined the translucent plastic with the double-sided display panel of this invention.</figref><figref num="9">It is a figure which shows the electronic device to which the double-sided display panel of this invention is applicable.</figref><figref num="10">It is a figure which shows the double-sided display panel.</figref><figref num="11">It is a figure which shows the one pixel structure of this invention.</figref><figref num="12">It is a figure which shows the one pixel structure of this invention.</figref><figref num="13">It is a figure which shows the structural example of the signal line drive circuit.</figref><figref num="14">It is a figure which shows the structural example of the signal line drive circuit.</figref>
Embodiments of the present invention will be described below.
(Embodiment 1) In the first embodiment, the brightness of the light emitting element is deteriorated on the first display surface and the second display surface by making the emission brightness different between the first display surface and the second display surface of the double-sided display panel. The first example of correcting the difference in speed is shown.
First, the double-sided display panel will be described with reference to FIG. 10 (FIG. 10).
FIG. 10 (A) (FIG. 10 (A)) is a diagram showing a double-sided display panel, and FIG. 10 (B) (FIG. 10 (B)) is FIG. 10 (A) (FIG. 10 (A)). It is a figure which shows the a-a'cross section of. 10001 is a substrate, 10002 is a source signal line drive circuit, 10003 is a first gate signal line drive circuit, and 10004 is a second gate signal line drive circuit. The double-sided display panel has a first display surface 10005 on one surface of the substrate 10001, and a second display surface 10006 on the surface of the substrate 10001 opposite to the first display surface 10005. The first display surface 10005 displays in the direction of arrow 10007, and the second display surface 10006 displays in the direction of arrow 10008. Note that FIG. 10 (Fig. 10) shows an example of a double-sided display panel, and the number of source signal line drive circuits and gate signal line drive circuits to be provided and the positions to be provided should be appropriately changed. Can be done.
Next, an example of the cross-sectional structure of one pixel of the double-sided display panel is shown in FIG. 5 (FIG. 5 (A)). Here, in the present specification, in the case of a multicolor display panel using R (red), G (green), and B (blue) light emitting elements, one pixel is any of R, G, and B. It shall indicate the region formed by the light emitting element of one color.
In FIG. 5 (A) (FIG. 5 (A)), 5101 is a first driving TFT, 5102 is a second driving TFT, 5103 is a first pixel electrode using a reflective material, and 5104 is transparent. Second pixel electrode using a light material, 5105 is an EL layer, 5106 is a counter electrode using a light transmissive material, 5107 is a reflective film using a reflective material, 5108 is a first display area, 5109. Indicates a second display region, 5112 indicates a first light emitting element, and 5113 indicates a second light emitting element. The first display area 5108 and the second display area 5109 have the same area. The first light emitting element 5112 is composed of a first pixel electrode 5103, an EL layer 5105, and a counter electrode 5106, and the second light emitting element 5113 is composed of a second pixel electrode 5104, an EL layer 5105, and a counter electrode 5106. .. Further, the light emission of the first light emitting element 5112 in the first display area 5108 contributes to the display of the first display surface, and the light emission of the second light emitting element 5113 in the second display area 5109 is the second. Contributes to the display of the display surface of.
In the first display area 5108, a current flows between the first pixel electrode 5103 and the counter electrode 5106 connected to the first drive TFT 5101, and the EL layer 5105 of the first display area 5108 emits light. At this time, since the first pixel electrode 5103 uses a reflective material and the counter electrode 5106 uses a translucent material, light is emitted from the EL layer 5105 in the direction of the counter electrode (direction of arrow 5110). That is, the first light emitting element 5112 emits light in the direction of arrow 5110.
In the present specification, the translucent material means, for example, a transparent conductive film such as ITO or aluminum formed with a thickness capable of transmitting light, and the reflective material means, for example, a property of reflecting light such as aluminum. It shall indicate a conductive material having.
Further, in the second display region, a current flows between the second pixel electrode 5104 and the counter electrode 5106 connected to the second drive TFT 5102, and the EL layer 5105 of the second display region 5109 emits light. At this time, since the second pixel electrode 5104 is made of a translucent material and the reflective film 5107 is formed on the counter electrode 5106, the direction from the EL layer 5105 to the second pixel electrode 5104 (direction of arrow 5111). ) Is emitted light. That is, the second light emitting element 5113 emits light in the direction of arrow 5111. The double-sided display panel shown in FIGS. 5 (A) (FIG. 5 (A)) is characterized by having two independent pixel electrodes (a first pixel electrode and a second pixel electrode).
Fig. 1 (Fig. 1) shows a case where the double-sided display panel shown in Fig. 5 (A) (Fig. 5 (A)) is provided on the lid of the mobile information terminal so that both sides of the lid can display. .. As an example, the state in which the notebook PC is open is shown in FIG. 1 (A) (Fig. 1 (A)), and the state in which the notebook PC is closed is shown in Fig. 1 (B) (Fig. 1 (B)).
The notebook PC has a first housing (lid) 1001 and a second housing 1002, the first housing 1001 has a double-sided display panel, and the second housing 1002 has operation keys 1004 and the like. The double-sided display panel has a first display surface 1003 on the front surface and a second display surface 1101 on the back surface.
When the notebook PC is used in the open state (Fig. 1 (A) (Fig. 1 (A))), the first display surface 1003 is in the display state, and when the lid 1001 is closed, the second display surface 1003 is displayed. Display surface 1101 is in the display state. The case where the notebook PC is opened to display the first display surface 1003 and the case where the lid is closed to display the second display surface 1101 are used when the notebook PC is opened and used. Since the light emitting element is used more frequently, the light emitting element (corresponding to the first light emitting element 5112 in FIG. 5 (A) (Fig. 5 (A))) that contributes to the display of the first display surface 1003 is the second. The brightness deterioration rate is faster than that of the light emitting element (corresponding to the second light emitting element 5113 in FIG. 5 (A) (Fig. 5 (A))) that contributes to the display of the display surface 1101 of the above. It will disappear. In that case, even if the brightness of the light emitting element that contributes to the display on the second display surface 1101 has not deteriorated and can be sufficiently used, it cannot be used as a notebook PC. However, if the rate of luminance deterioration of the light emitting element that contributes to the display in the first display area and the light emitting element that contributes to the display in the second display area can be made to be substantially the same, the life of the double-sided display panel can be extended. be able to. Therefore, the amount of current flowing through the light emitting element (the first light emitting element 5112 in FIG. 5 (A) (Fig. 5 (A))) that contributes to the display on the first display surface contributes to the display on the second display surface. It contributes to the display of the first display surface 1003 by making it smaller than the amount of current flowing through the light emitting element (the second light emitting element 5113 in FIG. 5 (A) (Fig. 5 (A))). The emission brightness of the light emitting element (first light emitting element 5112 of FIG. 5 (A) (FIG. 5 (A)) contributes to the display of the second display surface 1101 (FIG. 5 (A) (Fig. 5 (A)). If it is made lower than the emission brightness of the second light emitting element 5113) in FIG. 5 (A), the difference in the brightness deterioration rate of the light emitting element that contributes to the display of the first display surface and the second display surface. Can be reduced.
In FIG. 5 (A) (FIG. 5 (A)), in order to make the amount of current flowing through the first light emitting element 5112 smaller than the amount of current flowing through the second light emitting element 5113, for example, the first The channel size (channel width / channel length) of the drive TFT 5101 may be smaller than the channel size (channel width / channel length) of the second drive TFT 5102. Also, the voltage between the gate and source of the first drive TFT5101 is Vgs.<sub>1</sub>, Vgs the voltage between the gate and source of the second drive TFT 5102<sub>2</sub>When | Vgs<sub>1</sub>| <| Vgs<sub>2</sub>Even if |, the amount of current flowing through the first light emitting element 5112 can be made smaller than the amount of current flowing through the second light emitting element 5113. | Vgs<sub>1</sub>| <| Vgs<sub>2</sub>To make it |, a method of making the potentials of the video signal applied to the gate of the first driving TFT5101 and the video signal applied to the gate of the second driving TFT5102 different, and applying it to the first pixel electrode. There is a method of making the potential of the signal to be applied different from the potential of the signal applied to the second pixel electrode.
First, an example in which the potentials of the video signal applied to the gate of the first driving TFT5101 and the video signal applied to the gate of the second driving TFT5102 are different will be described with reference to FIG. 11 (FIG. 11). In FIG. 11 (Fig. 11), the portion surrounded by the dotted frame 11011 is one pixel, 11001 is the first source signal line, 11002 is the gate signal line, 11003 is the current supply line, and 11004 is the first switching. For TFT, 11005 is the first drive TFT, 11006 is the second drive TFT, 11007 is the first light emitting element, 11008 is the second light emitting element, 11009 and 11010 are counter electrodes, 11012 is the second switching. TFT, 11013 indicates the second source signal line. In each pixel, the region where the emitted light of the first light emitting element 11007 is obtained is the first display region, and the region where the emitted light of the second light emitting element 11008 is obtained is the second display region, both of which are one pixel. include. The gate electrode of the first switching TFT 11004 is electrically connected to the gate signal line 11002, the first electrode is electrically connected to the first source signal line 11001, and the second electrode is the first. It is electrically connected to the gate electrode of the driving TFT11005. The gate electrode of the second switching TFT 11012 is electrically connected to the gate signal line 11002, the first electrode is electrically connected to the second source signal line 11013, and the second electrode is the second. It is electrically connected to the gate electrode of the driving TFT 11006. The first electrode of the first driving TFT 11005 is electrically connected to the current supply line 11003, and the second electrode is electrically connected to the first electrode of the first light emitting element 11007. The first electrode of the second driving TFT 11006 is electrically connected to the current supply line 11003, and the second electrode is electrically connected to the first electrode of the second light emitting element 11008. The second electrode of the first light emitting element 11007 and the second electrode of the second light emitting element 11008 are counter electrodes 11009, which have a potential difference from each other with the current supply line, respectively.
By making the potential of the video signal applied to the first source signal line 11001 different from the potential of the video signal applied to the second source signal line 11013 | Vgs<sub>1</sub>| <| Vgs<sub>2</sub>| Can be. Further, in such a circuit configuration, since the first and second source signal lines are provided, different video signals can be supplied from the respective source signal lines, so that the first display surface and the first display surface can be supplied. The display on the second display surface can be different.
Next, an example in which the potential of the signal applied to the first pixel electrode and the potential of the signal applied to the second pixel electrode are different will be described with reference to FIG. 12 (FIG. 12). In Fig. 12 (Fig. 12), the part surrounded by the dotted frame 12011 is one pixel, 12001 is the source signal line, 12002 is the gate signal line, 12003 is the first current supply line, and 12004 is the switching TFT. 12005 is the first drive TFT, 12006 is the second drive TFT, 12007 is the first light emitting element, 12008 is the second light emitting element, 12009 and 12010 are counter electrodes, and 12012 is the second current supply line. .. In each pixel, the region where the emitted light of the first light emitting element 12007 is obtained is the first display region, and the region where the emitted light of the second light emitting element 12008 is obtained is the second display region, both of which are one pixel. include. The gate electrode of the switching TFT 12004 is electrically connected to the gate signal line 12002, the first electrode is electrically connected to the source signal line 12001, and the second electrode is the gate of the first driving TFT 12005. It is electrically connected to the electrodes. The first electrode of the first driving TFT 12005 is electrically connected to the first current supply line 12003, and the second electrode is electrically connected to the first electrode of the first light emitting element 12007. ing. The first electrode of the second driving TFT 12006 is electrically connected to the second current supply line 12012, and the second electrode is electrically connected to the first electrode of the second light emitting element 12008. ing. The second electrode of the first light emitting element 12007 and the second electrode of the second light emitting element 12008 are electrically connected to the counter electrodes 12009 and 12010 having a potential difference from each other with the current supply line, respectively. Make the potential applied to the first electrode of the first current supply line 12003 to the first drive TFT12005 different from the potential applied to the first electrode of the second current supply line 12012 to the second drive TFT12006. By | Vgs<sub>1</sub>| <| Vgs<sub>2</sub>| Can be.
As described above, in the double-sided display panel, the emission brightness of the display surface of the frequently used display surface is lower than the emission brightness of the display surface of the less frequently used display surface, so that both display surfaces of the double-sided display panel can be displayed. The difference in the brightness deterioration rate of the light emitting element caused by the difference in the frequency of use can be reduced, and the life of the double-sided display panel can be extended.
In the present embodiment, the first display surface is displayed when the notebook PC is open, and the second display surface is displayed when the notebook PC is closed (the first display surface). Is frequently used), but is not limited to this. It suffices if the emission brightness of the display surface having a higher frequency of use can be made lower than the emission brightness of the display surface having a lower frequency of use. Further, in the present embodiment, the notebook PC has been described as an example of the mobile information terminal, but the present embodiment is not limited to the notebook PC. In addition to notebook PCs, the display panel of the present invention can be applied as long as the first display surface and the second display surface of the double-sided display panel have different usage frequencies.
In addition, as a method of multicolor display of the double-sided display panel of the present invention, as a matter of course, an RGB painting method for separately painting EL layers that emit R, G, and B colors, and a color filter for the EL layer that emits white light are used. A known multicolor display method such as a color filter method for combining colors and a color conversion method for combining a color conversion layer with an EL layer that emits blue light may be used.
(Embodiment 2) In the present embodiment, in the circuit configuration of FIG. 11 (FIG. 11), an example of a signal line drive circuit that supplies video signals having different potentials to the first source signal line 11001 and the second source signal line 11013. Will be described below.
First, a first configuration example of the signal line drive circuit is shown in FIG. 13 (FIG. 13). FIG. 13 (FIG. 13) shows the first source signal line 11001 and the second source signal line of FIG. 11 (FIG. 11) when the same display is performed on the first display surface and the second display surface. This is a configuration example of a signal line drive circuit for supplying a video signal having a potential different from that of 11013, and shows a signal line drive circuit of an active matrix type double-sided display panel of m rows × n columns. In FIG. 13 (Fig. 13), 13001 is a D-flip-flop (D-FF), 13002 is a shift register, 13003a is a first latch circuit (LAT1), 13003b is a second latch circuit (LAT2), and 13004 is. Level shifter (LS), 13005 indicates a buffer. In addition, S-CK is a clock signal, S-CKb is a clock inversion signal, S-SP is a start pulse, Digital Video is a digital video signal, and Latch. Pulse indicates a latch pulse. In level shifter 13004, LS1 indicates the first level shifter, LS2 indicates the second level shifter, and in buffer 13005, Buffer1 indicates the first buffer and Buffer2 indicates the second buffer. The first level shifter and the second level shifter are connected to the output part of the second latch circuit, the output part of the first level shifter is connected to the input part of the first buffer, and the output part of the second level shifter. Is connected to the input of the second buffer. The first shift register and the first buffer are connected to the same power supply, and the second shift register and the second buffer are connected to a different power supply than the power supply to which the first shift register and the first buffer are connected. Has been done. The shift register 13002 is composed of n-stage D-flip-flops 13001, and a clock signal (S-CK), a start pulse (S-SP), and a clock inversion signal (S-CKb) are input. Sampling pulses are sequentially output according to the timing of these signals. The sampling pulse output from the shift register 13002 is input to the first latch circuit 13003a. A digital video signal (Digital Video) is input to the first latch circuit 13003a, and the video signal is held in each row according to the timing at which the sampling pulse is input. When the holding of the video signal to the last row is completed in the first latch circuit 13003a, the latch pulse (Latch) is applied to the second latch circuit 13003b during the horizontal blanking interval. Pulse) is input, and the video signals held in the first latch circuit 13003a are simultaneously transferred to the second latch circuit 13003b. After that, the held video signal undergoes pulse amplitude conversion in the two level shifters connected from the respective outputs of the second latch circuit, and then the video signal waveform is shaped in the buffer, and then each It is output to the source signal lines S11 to Sn1 and S12 to Sn2. Here, the source signal line S11 indicates the first source signal line in the first column, and Sn1 indicates the first source signal line in the nth column. Further, the source signal line S12 indicates the second source signal line in the first column, and Sn2 indicates the second source signal line in the nth column.
In the first configuration example of the signal line drive circuit, the first shift register and the first buffer are connected to the same power supply, and the second shift register and the second buffer are the first shift register and the first buffer. Since it is connected to a power source different from the power source to which is connected, it is possible to supply video signals having different potentials to the first source signal line and the second source signal line.
In the first configuration example, an example in the case of the digital gradation method is shown, but even in the analog gradation method, video signals having different potentials are generated in the first source signal line 11001 and the second source signal line 11013. Needless to say, it can be supplied and is not limited to the digital gradation method.
Next, a second configuration example of the signal line drive circuit is shown in FIG. 14 (FIG. 14). FIG. 14 (Fig. 14) shows a configuration example of a source signal line drive circuit when different displays are displayed on the first display surface and the second display surface, and is an active matrix type double-sided display panel of m rows × n columns. The signal line drive circuit of is shown. In FIG. 14 (Fig. 14), 14001 is a D-flip-flop (D-FF), 14002 is a shift register, 14003a is a first latch circuit (LAT1), 14003b is a second latch circuit (LAT2), and 14004 is. Level shifter (LS), 14005 indicates a buffer. In level shifter 14004, LS1 indicates the first level shifter, LS2 indicates the second level shifter, and in buffer 14005, Buffer1 indicates the first buffer and Buffer2 indicates the second buffer. The first level shifter and the second level shifter are connected to the output section of the second latch circuit in different stages, and the output section of the first level shifter is connected to the input section of the first buffer, and the second level shifter is connected to the input section of the first buffer. The output section of the level shifter is connected to the input section of the second buffer. The first shift register and the first buffer are connected to the same power supply, and the second shift register and the second buffer are connected to a different power supply than the power supply to which the first shift register and the first buffer are connected. Has been done. In addition, S-CK indicates a clock signal, S-CKb indicates a clock inversion signal, S-SP indicates a start pulse, Digital Video indicates a digital video signal, and Latch Pulse indicates a latch pulse. The shift register 14002 is composed of a 2n-stage D-flip-flop 14001, and a clock signal (S-CK), a start pulse (S-SP), and a clock inversion signal (S-CKb) are input. Sampling pulses are sequentially output according to the timing of these signals. The sampling pulse output from the shift register 13002 is input to the first latch circuit 13003a. The first latch circuit 13003a has a digital video signal (Digital). Video) is input, and the video signal is held in each column according to the timing at which the sampling pulse is input. When the holding of the video signal up to the last row is completed in the first latch circuit 13003a, a latch pulse is input to the second latch circuit 13003b during the horizontal return period, and the first latch circuit 13003a is input with the latch pulse. The held video signals are simultaneously transferred to the second latch circuit 13003b. After that, the held video signal undergoes pulse amplitude conversion in the level shifter, and then the video signal waveform is shaped in the buffer and then output to the respective source signal lines S11 to Sn1 and S12 to Sn2. .. Here, the source signal line S11 indicates the first source signal line in the first column, and Sn1 indicates the first source signal line in the nth column. Further, the source signal line S12 indicates the second source signal line in the first column, and Sn2 indicates the second source signal line in the nth column.
In the second configuration example of the signal line drive circuit, the first shift register and the first buffer are connected to the same power supply, and the second shift register and the second buffer are the first shift register and the first buffer. Since it is connected to a power source different from the power source to which is connected, it is possible to supply video signals having different potentials to the first source signal line and the second source signal line. Further, in the second configuration example of the signal line drive circuit, the first configuration is that the video signals supplied to the first source signal line and the second source signal line are generated from different digital video signals. Unlike the example, different images can be displayed on the first display surface and the second display surface.
In this way, video signals having different potentials can be supplied to the first source signal line 11001 and the second source signal line 11013. In this example, the case of the digital gradation method is shown, but even in the analog gradation method, video signals having different potentials are supplied to the first source signal line 11001 and the second source signal line 11013. Is possible, and it goes without saying that the method is not limited to the digital gradation method.
(Embodiment 3) In the third embodiment, the brightness of the light emitting element is deteriorated on the first display surface and the second display surface by making the emission brightness different between the first display surface and the second display surface of the double-sided display panel. A second example of correcting the difference in speed is shown. Specifically, in the double-sided display panel, the deterioration rate of the light emitting element on the first display surface and the second display surface is increased by making the aperture ratios of the first display surface and the second display surface different from each other. Correct the difference.
FIG. 5 (B) (FIG. 5 (B)) shows a cross-sectional view of a double-sided display panel in one pixel, which is an example in which the aperture ratio of each pixel is different between the first display surface and the second display surface. .. The aperture ratio of each pixel is different between the first display surface and the second display surface, that is, the area of the pixel electrode that contributes to the emission of EL per pixel is the area of the first display surface and the second display surface. By making them different, the current densities on the first display surface and the second display surface can be made different.
In Fig. 5 (B) (Fig. 5 (B)), 5001 is the first driving TFT, 5002 is the second driving TFT, 5003 is the first pixel electrode using a reflective material, and 5004 is transparent. The second pixel electrode using a light material, etc., 5005 is an EL layer, 5006 is a counter electrode using a translucent material, 5007 is a reflective film using a reflective material, 5008 is the first display area, 5009. Indicates a second display region, 5012 indicates a first light emitting element, and 5013 indicates a second light emitting element. The light emission of the first light emitting element 5012 in the first display area 5008 contributes to the display of the first display surface, and the light emission of the second light emitting element 5013 in the second display area 5011 is the second. Contributes to the display of the display surface of.
In the first display area 5008, a current flows between the first pixel electrode 5003 and the counter electrode 5006 connected to the first drive TFT 5001, and the EL layer 5005 of the first display area 5008 emits light. At this time, since the first pixel electrode 5003 uses a reflective material and the counter electrode 5006 uses a translucent material, light is emitted from the EL layer 5005 in the direction of the counter electrode (direction of arrow 5010). That is, the first light emitting element 5012 emits light in the direction of arrow 5010.
Further, in the second display area 5009, a current flows between the second pixel electrode 5004 and the counter electrode 5006 connected to the second drive TFT 5002, and the EL layer 5005 of the second display area 5009 emits light. At this time, since the second pixel electrode 5004 uses a translucent material and the reflective film 5007 is formed on the counter electrode 5006 in the second display region 5009, the EL layer 5005 to the second pixel electrode 5004 Light is emitted in the direction (direction of arrow 5011). That is, the second light emitting element 5013 emits light in the direction of arrow 5011.
As described above, since the areas of the first pixel electrode 5003 and the second pixel electrode 5004 are different, the light emitting element contributing to the display of the first display surface and the display of the second display surface can be displayed. The current densities of the contributing light emitting elements can be made different from each other. The light emitting element that contributes to the display of the frequently used display surface has a lower current density than the light emitting element that contributes to the display of the infrequently used display surface, that is, the frequently used display surface is used frequently. By making the aperture ratio higher than that of the display surface with a low frequency, it is possible to reduce the difference in the brightness deterioration rate between the display surface with a low frequency of use and the display surface with a high frequency of use, and the life of the double-sided display panel can be extended. Can be lengthened. The configuration shown in this embodiment is effective when the frequency of use on the first display surface and the second display surface is different.
Note that FIG. 5 (B) (FIG. 5 (B)) shows an example in which the area of the first pixel electrode 5003 is smaller than the area of the second pixel electrode 5004, but the present invention is not limited to this. If the current density of the frequently used display surface can be made smaller than the current density of the infrequently used display surface, that is, the aperture ratio of the frequently used display surface is higher than the aperture ratio of the infrequently used display surface. If possible, the area of the first pixel electrode 5003 may be larger than the area of the second pixel electrode 5004.
It should be noted that this embodiment can be implemented in combination with the first embodiment. That is, both the aperture ratio and the emission brightness can be made different from each other on the first display surface and the second display surface. If the aperture ratio of the display surface having a higher frequency of use is higher and the emission brightness of the display surface having a higher frequency of use is lower, the difference in the deterioration rate of the display surfaces can be reduced. By making both the emission brightness and the aperture ratio different from each other in this way, it is possible to increase the emission brightness of the display surface which is frequently used as compared with the case where only the emission brightness is different from each other.
(Embodiment 4) In the fourth embodiment, a circuit configuration for controlling the display / non-display of the first display surface and the second display surface of the double-sided display panel will be described. A circuit diagram of an embodiment of the present invention is shown in FIG. 2 (FIG. 2). Here, a thin film transistor (TFT) is used as the switch element and the driving element, but the present invention is not particularly limited. For example, MOS transistors, organic transistors, molecular transistors and the like can be mentioned, and all of them may be used in the same manner. Further, in the TFT, one of the source region and the drain region is described as a first electrode and the other as a second electrode.
In FIG. 2 (Fig. 2), the area surrounded by the dotted frame 2011 is one pixel, and the source signal line 2001, the gate signal line 2002, the current supply line 2003, the switching TFT2004, the first drive TFT2005, and the first It has two driving TFT 2006, a first light emitting element 2007, and a second light emitting element 2008. In each pixel, the area where the emitted light of the first light emitting element 2007 is obtained is the first display area, and the area where the emitted light of the second light emitting element 2008 is obtained is the second display area, both of which are one pixel. include.
The gate electrode of the switching TFT 2004 is electrically connected to the gate signal line 2002, the first electrode is electrically connected to the source signal line 2001, and the second electrode is for the first and second drives. It is electrically connected to the gate electrodes of TFT2005 and 2006. The first electrode of the first driving TFT 2005 is electrically connected to the current supply line 2003, and the second electrode is electrically connected to the first electrode of the first light emitting element 2007. The first electrode of the second driving TFT 2006 is electrically connected to the current supply line 2003, and the second electrode is electrically connected to the first electrode of the second light emitting element 2008. The second electrode of the first light emitting element 2007 and the second electrode of the second light emitting element 2008 are electrically connected to the counter electrodes 2009 and 2010 having a potential difference from each other with the current supply line, respectively.
The video signal output to the source signal line 2001 is input to the gate electrodes of the first and second drive TFTs 2005 and 2006 at the timing when the switching TFT2004 is turned on, and the first and second video signals are input according to the video signal. A current is supplied to the light emitting elements 2007 and 2008 to emit light. As described above, the emitted light is obtained from the front and back of the substrate in the first display area and the second display area, respectively. That is, the display is performed on both the first display surface and the second display surface.
According to this configuration, the light emitting and non-light emitting of the first light emitting element 2007 and the second light emitting element 2008 are controlled by the first and second driving TFTs 2005 and 2006. For example, FIG. As shown in 3), the first and second analog switches 3009, which operate exclusively between the current supply line 3003 and the first electrodes of the first and second drive TFTs 3005 and 3006, respectively. By providing 3010 and controlling ON / OFF by the display surface control signal 3013, when the first analog switch 3009 is turned ON for a certain period and the current is supplied to the first light emitting element 3007, the first display is displayed. An image is displayed in the area. On the other hand, the second analog switch 3010, which operates exclusively with the first analog switch 3009, is turned off at this time, and cuts off the current supply path to the second light emitting element 3008. Therefore, the second display area does not emit light. That is, the display is performed on the first display surface, and the display is not performed on the second display surface.
On the contrary, during the period when the second analog switch 3010 is turned on, the current is supplied to the second light emitting element 3008, and the image is displayed in the second display area, the first analog switch 3009 is turned off. The current supply path to the first light emitting element 3007 is cut off. Therefore, the first display area does not emit light. That is, the display is performed on the second display surface, and the display is not performed on the first display surface. At this time, the display surface control signal is output by the user performing some operation, and the display surface may be switched, or the state of being used (for example, the mobile information terminal or the like is folded or opened). The switching operation may be automatically performed depending on whether the user is in the state or not.
Further, instead of operating the first and second analog switches 3009 and 3010 exclusively, as shown in FIG. 4 (Fig. 4), the first display surface control signal 4003 and the second display surface control It may be controlled independently by using the signal 4004. According to this configuration, both the first display area and the second display area can be arbitrarily switched between display and non-display. That is, the display / non-display of the first display surface and the second display surface can be arbitrarily switched.
As a method of displaying different images in the first display area and the second display area by using the configurations shown in FIGS. 3 (3) and 4 (4), for example, one frame period In the above, a method of displaying the first display area in odd-numbered frames and displaying the second display area in even-numbered frames can be mentioned. At this time, the display surface control signal may be inverted every frame period, and the first and second analog switches 4001 and 4002 may be switched ON / OFF for each frame.
It should be noted that this embodiment can be implemented in combination with the first to third embodiments.
(Embodiment 5) In the present embodiment, in the double-sided display panel, the first display surface is a multicolor display and the second display surface is a single color display, so that the brightness of the light emitting elements on the first display surface and the second display surface is deteriorated. An example of correcting the difference in speed will be described.
FIG. 6 (A) (FIG. 6 (A)) shows a cross-sectional view of one pixel of a panel example in which only one of the first and second display surfaces emits light. In FIG. 6 (Fig. 6), 6001 is a driving TFT, 6002 is a pixel electrode using a translucent material, 6003 is an EL layer, 6004 is a counter electrode using a reflective material, and 6005 is a display area.
In the display area 6005, a current flows between the pixel electrode 6002 and the counter electrode 6004 connected to the driving TFT 6001, and the EL layer 6003 emits light. At this time, since the pixel electrode 6002 uses a translucent material and the counter electrode 6004 uses a reflective material, light is emitted from the EL layer 6003 in the direction of the pixel electrode.
FIG. 6 (B) (FIG. 6 (B)) is a diagram showing an example in which the first display surface and the second display surface emit light. In FIG. 6 (Fig. 6), 6101 is a first driving TFT, 6102 is a second driving TFT, 6103 is a first pixel electrode using a reflective material, and 6104 is a translucent material. 2 pixel electrodes, 6105 is an EL layer, 6106 is a counter electrode using a translucent material, 6107 is a reflective film using a reflective material, 6108 is a first display area, and 6109 is a second display area.
On the first display surface 6108, a current flows between the first pixel electrode 6103 and the counter electrode 6106 connected to the first drive TFT 6101, and the EL layer 6105 of the first display area 6108 emits light. At this time, since the first pixel electrode 6103 uses a reflective material and the counter electrode 6106 uses a translucent material, light is emitted from the EL layer 6105 in the direction of the counter electrode 6106 (direction of arrow 6110).
Further, in the second display area 6109, a current flows between the second pixel electrode 6104 and the counter electrode 6106 connected to the second drive TFT 6102, and the EL layer 6105 of the second display area 6109 emits light. At this time, since the second pixel electrode 6104 is made of a translucent material and the reflective film 6107 is formed on the counter electrode 6106, the direction from the EL layer 6105 to the second pixel electrode 6104 (direction of arrow 6111). Light is emitted to.
Of R, G, and B, only the highly reliable color element (color element with a long life) has the first display surface 6108 and the second as shown in Fig. 6 (B) (Fig. 6 (B)). Light is emitted to both of the display surfaces 6109, and the elements of the remaining colors are on one side of the first display surface and the second display surface as shown in Fig. 6 (A) (Fig. 6 (A)). By making it possible to emit light only on the display surface, the difference in reliability (difference in deterioration rate) between R, G, and B is compensated for, and the first display surface is a multicolor display and the second display surface is a single color. Can be displayed.
In the present embodiment, the case where the multicolor display is emitted from the EL layer in the direction of the pixel electrodes and the single color display is emitted from the EL layer in the direction of the counter electrode has been described, but the present invention is not limited to this, and the multicolor display is not limited to this. May be emitted from the EL layer in the direction of the counter electrode, and the monochromatic display may be emitted from the EL layer in the direction of the pixel electrode.
It should be noted that this embodiment can be implemented in combination with the first to fourth embodiments.
(Embodiment 6) In the present embodiment, an example will be described in which the first display surface is a multicolor display using a color filter and the second display surface is a single color display in the double-sided display panel.
The cross-sectional view of the double-sided display panel of this embodiment shown in FIG. 7 (FIG. 7) is shown. In FIG. 7 (Fig. 7), 7001 is a first driving TFT, 7002 is a second driving TFT, 7003 is a first pixel electrode using a reflective material, and 7004 is a translucent material. 2 pixel electrodes, 7005 is the EL layer, 7006 is the counter electrode using a translucent material, 7007 is a reflective film using a reflective material, 7008 is a color filter, 7009 is the first display area, 7010 is the second. Indicates the display area.
In the first display area 7009, a current flows between the first pixel electrode 7003 and the counter electrode 7006 connected to the first drive TFT 7001, and the EL layer 7005 of the first display area 7009 emits light. At this time, since the first pixel electrode 7003 uses a reflective material and the counter electrode 7006 uses a translucent material, light is emitted from the EL layer 7005 in the direction of the counter electrode (direction of arrow 7011).
Further, in the second display area 7010, a current flows between the second pixel electrode 7004 and the counter electrode 7006 connected to the second drive TFT 7002, and the EL layer 7005 of the second display area 7010 emits light. At this time, since the second pixel electrode 7004 uses a translucent material and the reflective film 7007 is formed on the counter electrode 7006 in the second display region, the direction from the EL layer 7005 to the second pixel electrode ( Light is emitted in the direction of arrow 7012).
Assuming that the EL layer emits white light, since a color filter is formed on the first display surface, the first display surface is multicolored and the second display surface is not formed with a color filter. , The second display surface becomes a white display.
It should be noted that this embodiment can be implemented in combination with the first to fourth embodiments.
In this embodiment, since the light emitting element used is only one color, it is possible to solve the problem that the deterioration rate is different among the elements R, G, and B.
(Embodiment 7) An example in which a double-sided display panel is provided on the lid of a mobile information terminal so that the operation can be performed even when the lid is closed will be described with reference to FIG. 1 (Fig. 1).
Normally, when operating the notebook PC, the notebook PC is opened (FIG. 1 (A) (FIG. 1 (A))) and operated using the operation keys 1004. Further, the second display surface 1101 is equipped with a touch panel, and even when the notebook PC is closed, the touch panel can be used for operation, which is convenient for use while moving.
It should be noted that this embodiment can be implemented in combination with the first to sixth embodiments.
<p> The case where the translucent plastic is attached to the double-sided display panel of the present invention mentioned in the embodiment will be described with reference to FIG. 8 (FIG. 8).</p><p> The double-sided display panel 8001 includes a source signal line drive circuit 8002, a first gate signal line drive circuit 8003, a second gate signal line drive circuit 8004, a first display surface 8005 on the front surface, and a second display surface 8008 on the back surface. Has.</p><p> FIG. 8 (A) (FIG. 8 (A)) is a diagram showing an example in which the first translucent plastic 8006 and the second translucent plastic 8007 are attached to the double-sided display panel 8001. FIG. (B) (FIG. 8 (B)) shows a cross-sectional view taken along the line a-a'of the example shown in FIG. 8 (A) (FIG. 8 (A)).</p><p> The first translucent plastic 8006 and the second translucent plastic 8007 are preferably colored, and the source signal line drive circuit 8002 on the double-sided display panel 8001 when no image is displayed, the first The patterns of the gate signal line drive circuit 8003, the second gate signal line drive circuit 8004, the first display surface 8005, the second display surface 8008, etc. are difficult to see from the outside.</p><p> FIG. 8 (C) (FIG. 8 (C)) is an example in which an image is displayed from the double-sided display panel 8001 through the first translucent plastic 8006, and the image is displayed on the first display surface 8005. When it is done, only the part where the EL emits light appears to float. The same applies to the second display surface 8008 side of the back surface. Furthermore, by pasting plastic, the double-sided display panel 8001 can be protected.</p><p> Further, although the first translucent plastic 8006 and the second translucent plastic 8007 are preferably colored, they may be mirror surface type.</p><p> Further, instead of pasting the translucent plastic on the double-sided display panel, a display portion or the like previously formed on a substrate such as glass may be transferred onto the translucent plastic by using transfer technology, or sealed. The translucent plastic may be used as the substrate.</p><p> Further, the translucent plastic may be used as the housing to cover the entire double-sided display panel, or the translucent plastic may be used as the case of the double-sided display panel.</p><p> This embodiment can be carried out in combination with the first to seventh embodiments.</p>
<p> The display device of the present invention can be used as a display unit of various electronic devices. In particular, it is desirable to use the display device of the present invention for a mobile device that is often used in an unstable state such as when moving.</p><p> Specific examples of the electronic device include a mobile information terminal (mobile phone, mobile computer, portable game machine, electronic book, etc.), a video camera, a digital camera, and the like. Specific examples of these electronic devices are shown in FIG. 9 (Fig. 9).</p><p> FIG. 9 (A) (FIG. 9 (A)) is a mobile phone, which includes a main body 9001, an audio output unit 9002, an audio input unit 9003, a double-sided display panel 9004, an operation switch 9005, an antenna 9006, and the like. The display device of the present invention can be used for the double-sided display panel 9004.</p><p> FIG. 9 (B) (FIG. 9 (B)) is a PDA (Personal Digital Assistant), which includes a first housing 9101, a double-sided display panel 9102, a second housing 9103, an operation switch 9104, and the like. The display device of the present invention can be used for the double-sided display panel 9102.</p><p> As described above, the application range of the display device of the present invention is extremely wide, and it can be used for electronic devices in all fields.</p><p> This embodiment can be carried out in combination with the first to seventh embodiments and the first embodiment.</p>
1001 First housing (lid) 1002 Second housing 1003 First display surface 1004 Operation keys 1101 Second display surface 2001 source signal line 2002 Gate signal line 2003 current supply line 2004 TFT for switching 2005 First drive TFT 2006 Second drive TFT 2007 First light emitting element 2008 Second light emitting element 2009 counter electrode 2011 dotted frame 3003 Current supply line 3005 First drive TFT 3006 Second drive TFT 3007 First light emitting element 3008 Second light emitting element 3009 First analog switch 3010 Second analog switch 3013 Display surface control signal 4001 First analog switch 4002 Second analog switch 4003 First display surface control signal 4004 Second display surface control signal 5001 First drive TFT 5002 Second drive TFT 5003 1st pixel electrode 5004 Second pixel electrode 5005 EL layer 5006 Opposite electrode 5007 Reflective film 5008 First display area 5009 Second display area 5010 arrow 5011 arrow 5012 Luminescent element 5013 Luminescent element 5101 First drive TFT 5102 Second drive TFT 5103 pixel electrode 5104 pixel electrode 5105 EL layer 5106 Counter electrode 5107 Reflective film 5108 First display area 5109 Second display area 5110 arrow 5111 arrow 5112 1st light emitting element 5113 Second light emitting element 6001 TFT for drive 6002 pixel electrode 6003 EL layer 6004 Opposite electrode 6005 Display area 6101 First drive TFT 6102 Second drive TFT 6103 First pixel electrode 6104 Second pixel electrode 6105 EL layer 6106 Counter electrode 6107 Reflective film 6108 First display area 6109 Second display area 6110 arrow 6111 arrow 7001 First drive TFT 7002 Second drive TFT 7003 1st pixel electrode 7004 2nd pixel electrode 7005 EL layer 7006 Opposite electrode 7007 Reflective film 7009 First display area 7010 Second display area 7011 arrow 7012 arrow 8001 Double-sided display panel 8002 Source signal line drive circuit 8003 1st gate signal line drive circuit 8004 Second gate signal line drive circuit 8005 First display surface 8006 First translucent plastic 8007 Second translucent plastic 8008 Second display surface 9001 body 9002 Audio output 9003 Voice input 9004 Double-sided display panel 9005 Operation switch 9006 antenna 9101 chassis 9102 Double-sided display panel 9103 housing 9104 Operation switch 10001 substrate 10005 First display surface 10006 Second display surface 10007 arrow 10008 Arrow 11001 Source signal line 11002 Gate signal line 11003 Current supply line 11004 TFT for switching 11005 First drive TFT 11006 Second drive TFT 11007 First light emitting element 11008 Second light emitting element 11009 counter electrode 11011 dotted frame 11012 TFT for switching 11013 Source signal line 12001 Source signal line 12002 Gate signal line 12003 Current supply line 12004 TFT for switching 12005 First drive TFT 12006 Second drive TFT 12007 1st light emitting element 12008 Second light emitting element 12009 Counter electrode 12011 Dotted line frame 12012 current supply line 13001 D-flip flop 13002 shift register 13004 Level shifter 13005 buffer 14001 D-flip flop 14002 shift register 14004 Level shifter 14005 buffer 13003a First latch circuit 13003b Second latch circuit
3 sheets
Sheet 1 Sheet 2 Sheet 3
Every citation, both ways
| Document | Relation | Office | Cited during |
|---|---|---|---|
| US9320942B2 | Cited by | United States of America | Applicant |
| JP2001067049A | Cites | Japan | – |
| JP2001332392A | Cites | Japan | – |
| JP2001075532A | Cites | Japan | – |
| JP2001184010A | Cites | Japan | – |
| JP2001075503A | Cites | Japan | – |
| JP2004040464A | Cites | Japan | – |
| JP2001051660A | Cites | Japan | – |
32 members in 6 offices
Priority claims7
| Document | Office | Kind | Date |
|---|---|---|---|
| 2002379297 | Japan | A | |
| 2002379297 | Japan | A | |
| 2002379297 | Japan | – | |
| 2010092775 | Japan | A | |
| 20022002379297 | – | – | – |
| JP20020379297 | – | – | – |
| JP20100092775 | – | – | – |
Members32
| Document | Office | Kind | |
|---|---|---|---|
| WO2004061807A1 | World Intellectual Property Organization (WIPO) | A1 | |
| AU2003289446A1 | Australia | A1 | |
| US2004263425A1 | United States of America | A1 | |
| KR20050085916A | Republic of Korea | A | |
| CN1732494A | China | A | |
| JPWO2004061807A1 | Japan | A1 | |
| JP2007108773A | Japan | A | |
| US7221092B2 | United States of America | B2 | |
| US2007188422A1 | United States of America | A1 | |
| CN100504966C | China | C | |
| JP2010211218A | Japan | A | |
| JP2010212246A | Japan | A | |
| JP2010217899A | Japan | A | |
| JP2010224545A | Japan | A | |
| JP4646630B2 | Japan | B2 | |
| JP4675430B2 | Japan | B2 | |
| JP4675431B2 | Japan | B2 | |
| KR20110116255A | Republic of Korea | A | |
| JP4801570B2 | Japan | B2 | |
| JP4877879B2 | Japan | B2 | |
| KR20120046295A | Republic of Korea | A | |
| KR101170344B1 | Republic of Korea | B1 | |
| US8242979B2 | United States of America | B2 | |
| KR101179155B1 | Republic of Korea | B1 | |
| KR20120104416A | Republic of Korea | A | |
| JP5111550B2This record | Japan | B2 | |
| US2013032808A1 | United States of America | A1 | |
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| US8947325B2 | United States of America | B2 | |
| US2015144973A1 | United States of America | A1 | |
| US9111842B2 | United States of America | B2 |
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Numbers
- Publication
- 5111550
- Publication, DOCDB
- 5111550
- Publication, EPODOC
- JP5111550B
- Application
- 92775
- Application, DOCDB
- 2010092775
- Application, EPODOC
- JP20100092775
Titles2
- Japanese
- 表示装置
- English
- Display device
Classification
- CPC, 14
- G06F1/32
- H10K59/128
- H01L27/156
- G06F1/3203
- G06F1/3265
- G09G3/30
- G09G2300/0439
- G09G2320/043
- H04M2250/16
- H04W52/027
- Y02D10/00
- Y02D30/70
- H10K59/38
- G09G3/3208
- IPC, 9
- G09G3 30
- G09G3 20
- G09F9 30
- G09F9 40
- H01L27 32
- H01L51 50
- G06F1 32
- H04M1 725
- H04M1 73
