Four-color data processing system
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Expired 27 April 2024, 2.4 years ago.
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24 claims: 22 independent, 2 dependent
- 1(a) The stage of gamma conversion for each of the input initial RGB gradation data, and (b-1) the scaling factor fixed to a value greater than 1 for each of the gamma-converted RGB gradation data. The stage of multiplying and rearranging (remapping), (b-2) the stage of extracting the white component based on each of the rearranged RGB gradation data, and (c) each of the gamma-converted RGB gradations. The stage of determining the RGBW gradation data in consideration of the data and the white component, and (d) the stage of setting the corrected RGBW gradation data by performing inverse gamma conversion on the determined RGBW gradation data. Including, The step (b-2) is When the highest gradation level, which is the gradation number corresponding to the maximum number of gradations that can be displayed by the display device, is smaller than or the same as the minimum value of the rearranged RGB, the maximum gradation level is set. Defined as the white component and extracted, When the maximum gradation level is larger than the minimum value of the rearranged RGB, the minimum value of the rearranged RGB is defined as the white component and extracted. A four-color conversion method characterized by preventing a decrease in brightness. (a)入力される初期RGB階調データに対してそれぞれガンマ変換する段階と、 (b-1)前記ガンマ変換された各RGB階調データに、1より大きい値に固定されているスケーリングファクターを乗算して再配置(remapping)する段階と、 (b-2)前記再配置された各RGB階調データを根拠としてホワイト成分を抽出する段階と、 (c)前記ガンマ変換された各RGB階調データと前記ホワイト成分とを考慮してRGBW階調データを確定する段階と、 (d)前記確定されたRGBW階調データに対してそれぞれ逆ガンマ変換して補正RGBW階調データを設定する段階と、を含み、 前記段階(b-2)は、 表示装置が表示可能な最大の階調数に対応する階調番号である最高階調レベルが、前記再配置されたRGBの最小値より小さいか同一である場合には、前記最高階調レベルを前記ホワイト成分として定義して抽出し、 前記最高階調レベルが、前記再配置されたRGBの最小値より大きい場合には、前記再配置されたRGBの最小値を前記ホワイト成分に定義して抽出し、 輝度低下を防止することを特徴とする4色変換方法。
- 4The gamma conversion unit that performs gamma conversion on the input initial RGB gradation data and the gamma-converted RGB gradation data are rearranged by multiplying each by a scaling factor fixed to a value greater than 1. The rearranged unit, the white extraction unit that defines and extracts the minimum value of the rearranged RGB gradation data as a white component, and the white component that is subtracted from the rearranged RGB gradation data. The data confirmation unit that confirms the new RGB gradation data and confirms the white component to the new white data, and the corrected RGBW gradation data are set by performing inverse gamma conversion on the confirmed RGBW gradation data. Including the inverse gamma converter The white extraction unit When the highest gradation level, which is the gradation number corresponding to the maximum number of gradations that can be displayed by the display device, is smaller than or the same as the minimum value of the rearranged RGB gradation data, the highest gradation The level is defined as the white component and extracted. When the maximum gradation level is larger than the minimum value of the rearranged RGB gradation data, the minimum value of the rearranged RGB gradation data is defined as the white component and extracted. A 4-color conversion device characterized by preventing a decrease in brightness. 入力される初期RGB階調データに対してそれぞれガンマ変換するガンマ変換部と、 前記ガンマ変換されたRGB階調データにそれぞれ、1より大きい値に固定されているスケーリングファクターを乗算して再配置する再配置部と、 前記再配置されたRGB階調データのうち、最小値をホワイト成分として定義して抽出するホワイト抽出部と、 前記再配置されたRGB階調データから前記ホワイト成分を減算して新しいRGB階調データを確定して、前記ホワイト成分を新しいホワイトデータに確定するデータ確定部と、 前記確定されたRGBW階調データに対してそれぞれ逆ガンマ変換して補正RGBW階調データを設定する逆ガンマ変換部と、を含み、 前記ホワイト抽出部は、 表示装置が表示可能な最大の階調数に対応する階調番号である最高階調レベルが前記再配置されたRGB階調データの最小値より小さいか同一である場合には、前記最高階調レベルを前記ホワイト成分として定義して抽出し、 前記最高階調レベルが前記再配置されたRGB階調データの最小値より大きい場合には、前記再配置されたRGB階調データの最小値を前記ホワイト成分として定義して抽出し、 輝度低下を防止することを特徴とする4色変換装置。
- 5An organic electric field emitting panel including an organic electric field emitting element that emits light corresponding to the amount of applied current and a driving element that controls the flow of current to control the light emission of the organic electric field emitting element, and a scan signal. Correction based on the scan drive unit that sequentially outputs to the scan line of the organic electric field light emitting panel, the data drive unit that outputs the data signal to the data line of the organic electric field light emitting panel, and the initial RGB gradation data provided from the outside. The four-color conversion unit includes an RGB gradation data and a four-color conversion unit that converts the correction W gradation data and outputs the data to the data drive unit, and the four-color conversion unit performs gamma conversion on the initial RGB gradation data. The gamma conversion unit, the rearrangement unit that rearranges the gamma-converted RGB gradation data by multiplying it by a scaling factor fixed to a value larger than 1, and the rearranged RGB gradation data. Among them, a white extraction unit that defines and extracts the minimum value as a white component, and the white component is subtracted from the rearranged RGB gradation data to determine new RGB gradation data, and the white component is new. The data confirmation part that is confirmed as white data, Includes an inverse gamma conversion unit that performs inverse gamma conversion on each of the determined RGBW gradation data and sets corrected RGBW gradation data.Mi, The white extraction unit When the highest gradation level, which is the gradation number corresponding to the maximum number of gradations that can be displayed by the display device, is smaller than or the same as the minimum value of the rearranged RGB gradation data, the highest gradation The level is defined as the white component and extracted. When the highest gradation level is larger than the minimum value of the rearranged RGB gradation data, the minimum value of the rearranged RGB gradation data is defined as the white component and extracted.An organic electroluminescent display device characterized by this. 印加される電流の量に対応する光を発光する有機電界発光素子と、電流の流れを制御して前記有機電界発光素子の発光を制御する駆動素子とを含む有機電界発光パネルと、 スキャン信号を前記有機電界発光パネルのスキャンラインに順次出力するスキャン駆動部と、 データ信号を前記有機電界発光パネルのデータラインに出力するデータ駆動部と、 外部から提供される初期RGB階調データを根拠として補正RGB階調データと補正W階調データに変換して前記データ駆動部に出力する4色変換部と、を含み、 前記4色変換部は、 前記初期RGB階調データに対してそれぞれガンマ変換するガンマ変換部と、 前記ガンマ変換されたRGB階調データにそれぞれ、1より大きい値に固定されているスケーリングファクターを乗算して再配置する再配置部と、 前記再配置されたRGB階調データのうち、最小値をホワイト成分として定義して抽出するホワイト抽出部と、 前記再配置されたRGB階調データから前記ホワイト成分を減算して新しいRGB階調データを確定して、前記ホワイト成分を新しいホワイトデータとして確定するデータ確定部と、 前記確定されたRGBW階調データに対してそれぞれ逆ガンマ変換して補正RGBW階調データを設定する逆ガンマ変換部と、を含み、 前記ホワイト抽出部は、 表示装置が表示可能な最大の階調数に対応する階調番号である最高階調レベルが前記再配置されたRGB階調データの最小値より小さいか同一である場合には、前記最高階調レベルを前記ホワイト成分として定義して抽出し、 前記最高階調レベルが前記再配置されたRGB階調データの最小値より大きい場合には、前記再配置されたRGB階調データの最小値を前記ホワイト成分として定義して抽出することを特徴とする有機電界発光表示装置。
- 6The data drive unit includes a data drive IC capable of data processing of bits larger than the bits of the initial RGB gradation data, and the data drive IC is input with the gray scale of the corrected RGBW gradation data expanded. However, even when the gradation level of each of the corrected RGBW gradation data is close to pure color, it is characterized in that the decrease in brightness is prevented.5The organic electroluminescent display device according to the above. 前記データ駆動部は、前記初期RGB階調データのビットより大きいビットのデータ処理が可能なデータ駆動ICを具備し、 前記データ駆動ICは、前記補正RGBW階調データのグレイスケールが拡張され入力されても処理が可能であり、前記補正RGBW階調データそれぞれの階調レベルが純色に近い場合にも、輝度低下を防止することを特徴とする請求項5記載の有機電界発光表示装置。
- 7The organic electroluminescent panel has a substrate, a source electrode, a drain electrode, and a gate electrode, respectively, and is connected to a large number of switching elements formed on the substrate and the drain electrode, respectively, to form first to fourth subpixels. A large number of pixel electrodes, a red subpixel that emits red light corresponding to the first subpixel, a green subpixel that emits green light corresponding to the second subpixel, and the third subpixel. A claim comprising a blue subpixel that emits blue light corresponding to a subpixel and a white subpixel that emits white light corresponding to the fourth subpixel.5The organic electroluminescent display device according to the above. 前記有機電界発光パネルは、 基板と、 ソース電極、ドレーン電極及びゲート電極をそれぞれ有し、前記基板上に形成された多数のスイッチング素子と、 前記ドレーン電極とそれぞれ連結され第1~第4サブピクセルを定義する多数のピクセル電極と、 前記第1サブピクセルに対応してレッド光を発光するレッドサブピクセルと、 前記第2サブピクセルに対応してグリーン光を発光するグリーンサブピクセルと、 前記第3サブピクセルに対応してブルー光を発光するブルーサブピクセルと、 前記第4サブピクセルに対応してホワイト光を発光するホワイトサブピクセルと、を含むことを特徴とする請求項5記載の有機電界発光表示装置。
- 8A metal electrode formed on the pixel electrode is further included, and the red subpixel is defined by a red organic light emitting layer formed between the pixel electrode and the metal electrode to emit red light, and the green subpixel is defined. A pixel is defined by a green organic light emitting layer formed between the pixel electrode and the metal electrode to emit green light, and the blue subpixel is formed between the pixel electrode and the metal electrode. It is defined by a blue organic light emitting layer that emits blue light, and the white subpixel is defined by a white organic light emitting layer that is formed between the pixel electrode and the metal electrode and emits white light. Claims to7The organic electroluminescent display device according to the above. 前記ピクセル電極上に形成された金属電極を更に含み、 前記レッドサブピクセルは、前記ピクセル電極と前記金属電極との間に形成されてレッド光を発光するレッド有機発光層により定義され、前記グリーンサブピクセルは、前記ピクセル電極と前記金属電極との間に形成されてグリーン光を発光するグリーン有機発光層により定義され、前記ブルーサブピクセルは、前記ピクセル電極と前記金属電極との間に形成されてブルー光を発光するブルー有機発光層により定義され、前記ホワイトサブピクセルは、前記ピクセル電極と前記金属電極との間に形成されてホワイト光を発光するホワイト有機発光層により定義されることを特徴とする請求項7記載の有機電界発光表示装置。
- 9A transparent electrode formed on the pixel electrode and a protective layer formed on the transparent electrode are further included, and the red subpixel is formed between the pixel electrode and the transparent electrode to emit red light. The green subpixel is defined by a green organic light emitting layer formed between the pixel electrode and the transparent electrode to emit green light, and the blue subpixel is defined by the pixel electrode. The white subpixel is defined by a blue organic light emitting layer formed between the pixel electrode and the transparent electrode to emit blue light, and the white subpixel is formed between the pixel electrode and the transparent electrode to emit white light. Claims characterized by being defined by layers7The organic electroluminescent display device according to the above. 前記ピクセル電極上に形成された透明電極と、 前記透明電極上に形成された保護層とを更に含み、 前記レッドサブピクセルは、前記ピクセル電極と透明電極との間に形成されてレッド光を発光するレッド有機発光層により定義され、前記グリーンサブピクセルは、前記ピクセル電極と透明電極との間に形成されてグリーン光を発光するグリーン有機発光層により定義され、前記ブルーサブピクセルは、前記ピクセル電極と透明電極との間に形成されてブルー光を発光するブルー有機発光層により定義され、前記ホワイトサブピクセルは、前記ピクセル電極と透明電極との間に形成されてホワイト光を発光するホワイト有機発光層により定義されることを特徴とする請求項7記載の有機電界発光表示装置。
- 10The white light emitting layer formed on the pixel electrode and the metal electrode formed on the white light emitting layer are further included, and the red subpixel is formed between the switching element and the pixel electrode to form the white. Of the light from the light emitting layer, defined by a red color filter layer that transmits only the red component, the green subpixel is formed between the switching element and the pixel electrode, and among the light from the white light emitting layer, green. The blue subpixel is defined by a green color filter layer that transmits only a component, and the blue subpixel is a blue color filter that is formed between the switching element and a pixel electrode and transmits only the blue component of the light emitted by the white light emitting layer. The white subpixel is defined by a layer, and is characterized by being defined by a white color filter layer formed between the switching element and a pixel electrode and transmitting only a white component of the light emitted by the white light emitting layer. Claim7The organic electroluminescent display device according to the above. 前記ピクセル電極上に形成されたホワイト発光層と、 前記ホワイト発光層上に形成された金属電極とを更に含み、 前記レッドサブピクセルは、前記スイッチング素子とピクセル電極との間に形成されて前記ホワイト発光層による光のうち、レッド成分のみを透過するレッドカラーフィルター層により定義され、前記グリーンサブピクセルは、前記スイッチング素子とピクセル電極との間に形成されて前記ホワイト発光層による光のうち、グリーン成分のみを透過するグリーンカラーフィルター層により定義され、前記ブルーサブピクセルは、前記スイッチング素子とピクセル電極との間に形成されて前記ホワイト発光層による光のうち、ブルー成分のみを透過するブルーカラーフィルター層により定義され、前記ホワイトサブピクセルは、前記スイッチング素子とピクセル電極との間に形成されて前記ホワイト発光層による光のうち、ホワイト成分のみを透過するホワイトカラーフィルター層により定義されることを特徴とする請求項7記載の有機電界発光表示装置。
- 11The white light emitting layer formed on the pixel electrode, the transparent electrode formed on the white light emitting layer, and the protective layer formed on the transparent electrode are further included, and the red subpixel is the protective layer. Of the light formed on the white light emitting layer, defined by a red color filter that transmits only the red component, the green subpixels are formed on the protective layer and of the light emitted by the white light emitting layer. The blue subpixel is defined by a green color filter that transmits only the green component, and the blue subpixel is defined by a blue color filter that is formed on the protective layer and transmits only the blue component of the light emitted by the white light emitting layer. A claim, wherein the white subpixel is defined by a white color filter formed on the protective layer and transmitting only the white component of the light emitted by the white light emitting layer.7The organic electroluminescent display device according to the above. 前記ピクセル電極上に形成されたホワイト発光層と、 前記ホワイト発光層上に形成された透明電極と、 前記透明電極上に形成された保護層とを更に含み、 前記レッドサブピクセルは、前記保護層上に形成されて前記ホワイト発光層による光のうち、レッド成分のみを透過するレッドカラーフィルターにより定義され、前記グリーンサブピクセルは、前記保護層上に形成されて前記ホワイト発光層による光のうち、グリーン成分のみを透過するグリーンカラーフィルターにより定義され、前記ブルーサブピクセルは、前記保護層上に形成されて前記ホワイト発光層による光のうち、ブルー成分のみを透過するブルーカラーフィルターにより定義され、前記ホワイトサブピクセルは、前記保護層上に形成されて前記ホワイト発光層による光のうち、ホワイト成分のみを透過するホワイトカラーフィルターにより定義されることを特徴とする請求項7記載の有機電界発光表示装置。
- 12The red subpixel further includes a white light emitting layer formed on the pixel electrode, an organic light emitting layer formed on the white light emitting layer, and a protective layer formed on the organic light emitting layer. The green subpixels are defined by a red color filter that is formed on the protective layer and transmits only the red component of the light emitted by the white light emitting layer, and the green subpixels are formed on the protective layer and the light emitted by the white light emitting layer. Of these, the blue subpixel is defined by a green color filter that transmits only the green component, and the blue subpixel is defined by a blue color filter that is formed on the protective layer and transmits only the blue component of the light emitted by the white light emitting layer. The white subpixel is defined by a region on the protective layer that transmits light by the white light emitting layer.7The organic electroluminescent display device according to the above. 前記ピクセル電極上に形成されたホワイト発光層と、 前記ホワイト発光層上に形成された有機発光層と、 前記有機発光層上に形成された保護層とを更に含み、 前記レッドサブピクセルは、前記保護層上に形成されて前記ホワイト発光層による光のうち、レッド成分のみを透過するレッドカラーフィルターにより定義され、前記グリーンサブピクセルは、前記保護層上に形成されて前記ホワイト発光層による光のうち、グリーン成分のみを透過するグリーンカラーフィルターにより定義され、前記ブルーサブピクセルは、前記保護層上に形成されて前記ホワイト発光層による光のうち、ブルー成分のみを透過するブルーカラーフィルターにより定義され、前記ホワイトサブピクセルは、前記保護層上で前記ホワイト発光層による光を透過する領域により定義されることを特徴とする請求項7記載の有機電界発光表示装置。
Independent claims10
116 paragraphs, as filed
The present invention relates to a four-color conversion method and its device and an organic electroluminescent display device using the same, and more specifically, a four-color conversion method and its device for preventing a decrease in brightness and a decrease in color sensation of pure colors. It relates to the organic electroluminescent display device used.
Generally, in a liquid crystal display device, brightness is increased by using four-color pixels in which white (W) is further added in addition to basic colors such as red (R), green (G), and blue (B). However, in the above-mentioned drive using four-color pixels, there is a problem that the brightness of achromatic colors due to pure white or color mixing increases, but the brightness with respect to pure colors decreases and the color feeling also changes.
For convenience of explanation, an RG system having two colors, R and G, will be described.
FIG. 1 is a diagram for explaining a general four-color drive.
As shown in FIG. 1, the color regions that can be represented by the RG system exist within the quadrangle defined by 0, R, G and RG points. Suppose that in order to increase the brightness of the RG system, the color is expressed by the RGY system to which a yellow (hereinafter, Y) pixel indicating by optically synthesizing red and green is added.
That is, assuming that the maximum brightness when both red and green pixels are attached and the maximum brightness when only yellow pixels are attached are the same, the maximum brightness is when red, green, and yellow are attached together. It is twice the maximum brightness when both red and green pixels are attached. Therefore, when displaying yellow, which is a mixed color of red and green, yellow that is brighter than yellow that can be displayed in the RG system can be displayed, so that the brightness can be improved.
However, when displaying pure red, the brightness of red cannot be increased because the yellow pixels cannot be used. Therefore, the color region that can be displayed in the RGY system can be extended only to the hexagonal shape, which is the region defined by the R, R'G, R'G', RG', and G points.
On the drawing, the first initial gradation data I existing in the square region defined by the 0, R'G, R'G', and RG'points is the first correction gradation data I'expanded twice. However, for the second initial gradation data II that is not located in the square area, it is displayed using the second correction gradation data II'expanded by a multiple smaller than twice. Become.
Thus, in the RGY system, the brightness can be doubled in the case of mixed colors existing in the square region defined by 0, R1, RG, G1 points, but 0, R, R1 points. In the case of a color in a triangular area, which is an area defined by 0, G, and G1 points, a brightness increasing effect is exerted on a mixed color defined by the above-mentioned square area. It can be confirmed that there is no such thing.
Further, when the actual display is realized, the pixel area of the RGY system is relatively reduced when compared with the RG system, so that the brightness is reduced in the case of a pure color.
In the above, the RG system and the RGY system have been described as an example, but the RGB system having more blue (B) pixels and the RGBW system having more blue (B) pixels and white (W) pixels can be extended by the same method. In the case of pure color, not only is there no effect of increasing the brightness, but also the pixel area is reduced, so there is a problem that the brightness is reduced.
<p> The technology and problems of the present invention are for solving such problems, and an object of the present invention is to prevent a decrease in brightness and a decrease in color feeling of a pure color while improving light efficiency4. The purpose is to provide a color conversion method.</p><p> Another object of the present invention is to provide a conversion device for performing the above-mentioned four-color conversion method.</p><p> Another object of the present invention is to provide an organic electroluminescent display device using the above-mentioned four-color conversion method.</p>
<p> In order to realize the above-mentioned object of the present invention, the four-color conversion method according to the present invention includes (a) a step of gamma conversion for each of the input initial RGB gradation data.<u style="single">(b-1) The step of multiplying each gamma-converted RGB gradation data by a scaling factor fixed to a value larger than 1 and rearranging (remapping), and (b-2) the rearrangement. At the stage of extracting the white component based on each RGB gradation data,</u>(c) The step of determining the RGBW gradation data in consideration of each of the gamma-converted RGB gradation data and the white component, and (d) the inverse gamma conversion of the determined RGBW gradation data. And the stage of setting the correction RGBW gradation data,<u style="single">Including, reduced brightness</u>It is characterized by preventing.</p><p> Further, in order to realize the other object of the present invention described above, the four-color conversion device according to the present invention has a gamma conversion unit that performs gamma conversion on the input initial RGB gradation data, and the gamma conversion unit. For each of the RGB gradation data<u style="single">, Fixed to a value greater than 1</u>A rearrangement unit that multiplies and rearranges the scaling factor, a white extraction unit that defines and extracts the minimum value of the rearranged RGB gradation data as a white component, and the rearranged RGB gradation. The white component is subtracted from the data to determine the new RGB gradation data, and the data confirmation unit that confirms the white component to the new white data and the determined RGBW gradation data are subjected to inverse gamma conversion. With the inverse gamma conversion unit that sets the corrected RGBW gradation data,<u style="single">Including, reduced brightness</u>It is characterized by preventing.</p><p><u style="single">In addition, in order to realize the other object of the present invention described above,</u><u style="single"> An organic electroluminescent panel including an organic electroluminescent element that emits light corresponding to the amount of applied current and a driving element that controls the flow of current to control the light emission of the organic electroluminescent element.</u><u style="single"> A scan drive unit that sequentially outputs scan signals to the scan line of the organic electroluminescent panel,</u><u style="single"> A data drive unit that outputs a data signal to the data line of the organic electroluminescent panel,</u><u style="single"> A four-color conversion unit that converts the initial RGB gradation data provided from the outside into corrected RGB gradation data and corrected W gradation data and outputs the data to the data drive unit.</u><u style="single">Provided is an organic electroluminescent display device comprising the above.</u></p><p><u style="single"> here,</u><u style="single"> The four-color converter</u><u style="single"> A gamma conversion unit that performs gamma conversion on the initial RGB gradation data, and</u><u style="single"> A rearrangement unit that multiplies and rearranges the gamma-converted RGB gradation data by a scaling factor fixed to a value greater than 1, respectively.</u><u style="single"> A white extraction unit that defines and extracts the minimum value of the rearranged RGB gradation data as a white component, and</u><u style="single"> A data determination unit that subtracts the white component from the rearranged RGB gradation data to determine new RGB gradation data and determines the white component as new white data.</u><u style="single"> An inverse gamma conversion unit that performs inverse gamma conversion for each of the determined RGBW gradation data and sets the corrected RGBW gradation data, and an inverse gamma conversion unit.</u><u style="single">including.</u></p><p> According to such a four-color conversion method and its device, and an organic electric field emission display device using the same, a data drive IC capable of processing a number of bits larger than the number of bits of the initial RGB gradation data is provided. When the gradation level of the corrected RGBW gradation data is close to pure color by outputting the corrected RGBW gradation data of each expanded gray scale or outputting the corrected RGBW gradation data using a fixed scaling factor. In addition, it is possible to prevent deterioration of brightness and color feeling.</p>
Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.
Normally, in a liquid crystal display device, it is impossible to increase the maximum brightness of each of R, G, and B once the specifications of the backlight brightness and the color filter are determined. However, in a self-luminous organic electro-Luminescent Display (OELD), the maximum brightness of each of R, G, and B can be increased by adjusting the data voltage.
On the other hand, increasing the brightness in a liquid crystal display device has the same meaning as increasing the light efficiency, that is, the transmittance. However, increasing the brightness and increasing the light efficiency in an organic electroluminescent display device do not always have the same meaning. That is, in the organic electroluminescent display device, in order to simply increase the brightness, the data voltage is adjusted to increase the amount of current flowing through the pixel. However, in such a case, the light efficiency does not increase. Therefore, in order to reduce the actual power consumption, the light efficiency must be increased. Here, an organic electroluminescent display device, particularly an active matrix organic electroluminescent display device (AMOELD), has a positive electrode formed by a transparent electrode such as ITO and a negative electrode such as a metal having a low work function. It has an organic light emitting layer structure in which a plurality of organic thin films are laminated between the two.
When a direct current is applied during driving, holes are injected from the positive electrode and electrons are injected from the negative electrode into the organic light emitting layer, and the holes and electrons are recombined in the organic light emitting layer to emit light.
In this way, using the fundamental difference between the liquid crystal display device and the organic electroluminescent display device, the pure color brightness and color generated during four-color driving, especially when the organic electroluminescent display device is driven in four colors. It is possible to solve the problem of decreased feeling. Specifically, the liquid crystal display device is scaled into a hexagonal shape as described in FIG. 1 described above, but in one embodiment of the organic electroluminescent display device according to the present invention, the scaling factor (S) is set to a constant value. By fixing, it expands to a quadrangle and scales as shown in Fig. 2 below.
FIG. 2 is a diagram for explaining a four-color drive according to an embodiment of the present invention.
As shown in FIG. 2, after extracting W gradation data from the initial RGB gradation data provided from the outside, it is converted into corrected RGB W gradation data which is four-color data. As a result, the brightness is increased by a scaling factor (S) times, and the display light efficiency is also increased.
Specifically, the part corresponding to the hexagon defined by 0, R, R'G, R'G', RG'and G point is the same method as the four-color drive system described in FIG. 1 described above. The initial RGB gradation data is converted into RGBW gradation data, and the gradation is displayed using the converted RGBW gradation data.
However, in the case of the outer part of the dotted line, that is, the triangular region defined by the R, R'and R'G points, or the triangular region defined by the G, RG'and G'points, the above-mentioned FIG. The RGBW gradation data calculated by the same method as the four-color drive method described above exceeds the displayable gradation range.
Therefore, by using a data drive IC that can process bits larger than the bits of the initial RGB gradation data, RGBW calculated by the same method as the 4-color drive method described in FIG. 1 for all areas. Gradation data can be displayed. For example, if the initial RGB gradation data is 6 bits each, the calculated RGBW gradation data will exceed 6 bits each, so data that can display 7 or 8 bit gradation data. The gray scale can be expanded by using a drive IC.
On the drawing, the first initial gradation data I corresponding to the mixed color can be displayed using the first correction gradation data I'expanded twice, and the second initial gradation data II close to pure color. Is also illustrated to be displayed using the second correction gradation data II'expanded twice. That is, in the case of the second correction gradation data II', the decrease in the brightness of the pure color can be solved by displaying the gradation data corresponding to the expanded gray scale.
In the above, the initial RGB gradation data is expanded and converted into the corrected RGBW gradation data by using a scaling factor larger than 1, preferably a scaling factor of 2, and is initially used to output the converted corrected RGBW gradation data. We explained that 4-color drive is performed using a data drive IC that can process data with bits larger than the RGB gradation data bits, but it is also possible to perform 4-color drive even if the scaling factor is fixed at 1. is there.
That is, the W gradation data is extracted from the initial RGB gradation data provided from the outside, and the new RGB gradation data and the new W gradation data are determined by subtracting the initial RGB gradation data and the W gradation data. Then, it can be converted into corrected RGBW gradation data which is 4-color data. At this time, the corrected RGBW gradation data is the data fixed to the scaling factor 1. As a result, the addition of W gradation data does not increase the brightness, but the optical efficiency of the display can be increased and the power consumption can be reduced. Of course, at this time, the brightness can be increased by adjusting the data voltage.
FIG. 3 is a drawing for explaining the organic electroluminescent display device according to the present invention.
As shown in FIG. 3, the organic electroluminescent display device according to the present invention includes a four-color conversion unit 10, a data drive unit 20, a scan drive unit 30, and an organic electroluminescent panel 40.
The 4-color converter 10 converts RGB gradation data R, G, and B provided by an external host or a graphic controller (not shown) into corrected RGBW gradation data R', G', B', W'. Then, the corrected RGBW gradation data R', G', B', and W'are provided to the data drive unit 20. Here, the corrected RGBW gradation data R', G', B', and W'are data to which W gradation data is added to increase the brightness.
The data drive unit 20 converts the corrected RGBW gradation data R', G', B', W'provided from the four-color conversion unit 10 into analog data signals (D1, D2, ..... Dm). It is converted and output to the organic electric field light emitting panel 40.
The scan drive unit 30 outputs a plurality of scan signals S1, S2, ..... Sn to the organic electroluminescent panel 40 in order.
The organic electroluminescent panel 40 has a plurality of data lines DL for transmitting data signals (D1, D2, ..... Dm) and a plurality of scan lines for transmitting scan signals S1, S2, ..... Sn. GL and multiple current supply lines VDDL that transmit power applied through one end are provided in a matrix.
Also, one unit pixel of the organic electroluminescent panel 40 has its first end connected to the data line DL, its second end connected to the scan line GL, and the data signal turned on / through through the third end based on the scan signal. The off-output switching element QS, the organic electroluminescent element EL whose one end is connected to the polar end and emits light corresponding to the amount of applied current, and the first end is connected to the other end of the organic electroluminescent element EL. , The second end is connected to the current supply line VDDL and responds to the on / off of the data signal input through the third end of the switching element QS from the first end to the second end or from the second end to the first end. It includes a drive element QD that controls the light emission of the organic electroluminescent element EL by controlling the current flowing through the.
A unit pixel displays one of R, G, B, and W light, but an independent electroluminescent device that outputs one of R, G, B, and W light can also be adopted. It is also possible to adopt a color filter method in which a light emitting element is configured in all the pixels and a separate color filter is provided in each unit pixel.
FIG. 4 is a drawing for showing an example of the four-color conversion unit of FIG.
As shown in FIG. 4, the four-color conversion unit 10 according to the embodiment of the present invention includes a gamma conversion unit 11, a rearrangement unit 12, a white extraction unit 13, a data determination unit 14, and an inverse gamma conversion unit 15, and includes an initial RGB scale. Converts the tone data to 4-color RGBW gradation data.
The gamma conversion unit 11 gamma-converts the input initial RGB data as shown in Equation 1 below, and the gamma-converted RGB data R<sub>γ</sub>, G<sub>γ</sub>, B<sub>γ</sub>Is provided to the rearrangement unit 12.
<maths num="1"><img file="JP4944366B2_D0001.tif" /></maths> Where R<sub>γ</sub>, G<sub>γ</sub>, B<sub>γ</sub>Is the standardized luminance of R, G, and B for each maximum luminance, that is, the RGB data reflecting the luminance information, and a is (1 / G).<sub>max</sub>)<sup>γ</sup>And R<sup>γ</sup>, G<sup>γ</sup>, B<sup>γ</sup>Is the gradation number corresponding to each of R, G, and B, and G<sub>max</sub>Is the highest gray level. In particular, when all gradations are 64 gradations, the highest gradation level G<sub>max</sub>Is 63.
The rearrangement unit 12 is gamma-converted R, G, and B data R.<sub>γ</sub>, G<sub>γ</sub>, B<sub>γ</sub>The data R of each of the rearranged R, G, and B is rearranged by multiplying the scaling factor as shown in Equation 2 below.<sub>γ</sub>', G<sub>γ</sub>', B<sub>γ</sub>'Is provided to the white extraction unit 13 and the data confirmation unit 14.
<maths num="2"><img file="JP4944366B2_D0002.tif" /></maths> Here, S is a scaling factor, which is the ratio of the maximum brightness of white light produced by mixing R, G, and B pixels to the maximum brightness of white light produced by mixing R, G, B, and W pixels. As shown, it is desirable to use a fixed value of 2 when using a color filter.
The white extraction unit 13 is the rearranged RGB data R<sub>γ</sub>'G<sub>γ</sub>'B<sub>γ</sub>The white component is extracted based on', and the extracted white component is provided to the data determination unit 14.
Specifically, as shown in Fig. 5, the rearranged RGB data R<sub>γ</sub>'G<sub>γ</sub>'B<sub>γ</sub>The minimum value of'is aGmax<sup>γ</sup>If greater than or equal to, aGmax<sup>γ</sup>Is defined as a white component and provided to the data determination unit 14. On the drawing, B data has the minimum value and aGmax<sup>γ</sup>Indicates a case larger than.
In addition, as shown in Fig. 5, the rearranged R, G, and B data R respectively.<sub>γ</sub>', G<sub>γ</sub>', B<sub>γ</sub>The minimum value of'is aGmax<sup>γ</sup>If it is smaller, the rearranged R, G, and B data R<sub>γ</sub>', G<sub>γ</sub>', B<sub>γ</sub>The minimum value of'is defined as the white component and provided to the data determination unit 14. On the drawing, B data has the minimum value and aGmax<sup>γ</sup>It shows the case where it is smaller.
<maths num="3"><img file="JP4944366B2_D0003.tif" /></maths> The data confirmation unit 14 has new RGBW data (R) based on the white component extracted by the white extraction unit 13 as shown in Equation 4 below.<sub>γ</sub>*, G<sub>γ</sub>*, B<sub>γ</sub>*, W<sub>γ</sub>*) Is confirmed, and each new RGBW data (R) is confirmed.<sub>γ</sub>*, G<sub>γ</sub>*, B<sub>γ</sub>*, W<sub>γ</sub>*) Is provided to the inverse gamma conversion unit 15.
<maths num="4"><img file="JP4944366B2_D0004.tif" /></maths> The inverse gamma conversion unit 15 provides the data drive unit 20 with data R', G', B', and W', respectively, of the corrected RGBW after inverse gamma conversion, as shown in Equation 5 below.
<maths num="5"><img file="JP4944366B2_D0005.tif" /></maths> On the other hand, when expressing a color with high purity as shown in the outer region shown in FIG. 2, that is, one of the four color-converted RGBW gradation data R', G', and B'W'is the maximum scale. If it is higher than the adjustment level Gmax, the gray scaling exceeds the maximum brightness Gmax that can be displayed. However, according to one embodiment of the present invention, the hue is normal by applying a data-driven IC capable of processing a bit number larger than the bit number of the initial RGB gradation data even if the gray scaling is extended. Can be displayed on. Of course, the above-mentioned data drive ICs are ICs provided in a plurality of drive units 20 shown in FIG.
In the white extraction unit 13 described above, the rearranged RGB data R<sub>γ</sub>', G<sub>γ</sub>', B<sub>γ</sub>'Minimum value and aGmax<sup>γ</sup>It will be described that the gradation is displayed by extracting the white component through comparison with the value and providing the extracted white component to the data determination unit 14.
As shown in Fig. 6, omitting the comparison process described above, the rearranged RGB data R<sub>γ</sub>', G<sub>γ</sub>', B<sub>γ</sub>It is also possible to display the gradation by defining the minimum value of'with the white component and providing it to the determination unit 14.
Above aGmax<sup>γ</sup>I explained that you set a value to define the white component, but aGmax<sup>γ</sup>Relocated R, G, B data R without setting a value<sub>γ</sub>', G<sub>γ</sub>', B<sub>γ</sub>The minimum value of'can also be defined by the white component. At this time, the data R of each of the rearrangements R, G, and B<sub>γ</sub>', G<sub>γ</sub>', B<sub>γ</sub>The rest of the data excluding the minimum value of'is defined by the difference from the white component.
In addition, in Fig. 4, the white component is extracted and new RGBW gradation data is generated by multiplying the gamma-converted RGB gradation data by a fixed value 2 as a scaling factor to double the gray scale. Explained. However, if the above-mentioned method is used, the number of bits of the data drive IC provided in the data driver must be expanded. For example, a 6-bit data drive IC that displays 64 gradations is required, but if 64 gradations are extended, such as 70 gradations or 80 gradations, a 7-bit data drive IC is required. You will need it.
As described above, an example will be described in which a separate scaling factor is not multiplied in order to generate new RGBW gradation data without increasing the number of bits of the data drive IC.
FIG. 7 is a drawing for explaining another example of the four-color conversion unit of FIG.
As shown in FIG. 7, the four-color conversion unit 10 according to another embodiment of the present invention includes a gamma conversion unit 16, a white extraction unit 17, a data determination unit 18, and an inverse gamma conversion unit 19, and collects initial RGB gradation data. Convert to 4-color RGBW gradation data.
The gamma conversion unit 16 gamma-converts the input initial RGB data as shown in Equation 6 below, and the gamma-converted RGB data R<sub>γ</sub>, G<sub>γ</sub>, B<sub>γ</sub>Is provided to the white extraction unit 17 and the data determination unit 18.
<maths num="6"><img file="JP4944366B2_D0006.tif" /></maths> Where R<sub>γ</sub>, G<sub>γ</sub>, B<sub>γ</sub>Is the brightness of each of R, G, and B stylized for each maximum brightness, that is, the data of each of R, G, and B reflecting the brightness information, and a is (1 / G).<sub>max</sub>)<sup>γ</sup>And R<sup>γ</sup>, G<sup>γ</sup>, B<sup>γ</sup>Is the gradation number corresponding to each of R, G, and B, and Gmax is the highest gradation level. In particular, when all gradations are 64 gradations, the gradation number is 0 to 63, so Gmax is 63.
The white extraction unit 17 is gamma-converted R, G, and B data R.<sub>γ</sub>, G<sub>γ</sub>, B<sub>γ</sub>The white component is extracted based on the above, and the extracted white component is provided to the data determination unit 18. As an example, assuming that 64 gradations are displayed, 1/2 brightness of 64 gradations is not 32 gradations, but 46 gradations as shown in FIG. A defined and defined white component can be provided to the data determination unit 18.
<maths num="7"><img file="JP4944366B2_D0007.tif" /></maths> As another example, for all cases, the gamma-converted R, G, and B data R are as shown in Equation 8 below.<sub>γ</sub>, G<sub>γ</sub>, B<sub>γ</sub>The minimum value among them is defined as a white component, and the defined white component is provided to the data determination unit 18.
<maths num="8"><img file="JP4944366B2_D0008.tif" /></maths> The data confirmation unit 18 determines the data of each of the new R, G, B, and W in consideration of the white component extracted by the white extraction unit 17, and confirms the new R, G, B and W data R<sub>γ</sub>', G<sub>γ</sub>', B<sub>γ</sub>'W<sub>γ</sub>'Is provided to the inverse gamma conversion unit 15.
<maths num="9"><img file="JP4944366B2_D0009.tif" /></maths> The inverse gamma conversion unit 19 is the new R, G, B, W data R determined by the data confirmation unit 18.<sub>γ</sub>', G<sub>γ</sub>', B<sub>γ</sub>'W<sub>γ</sub>In consideration of <sub>γ</sub>', G<sub>γ</sub>', B<sub>γ</sub>'W<sub>γ</sub>'Is provided to the data drive unit 20.
<maths num="10"><img file="JP4944366B2_D0010.tif" /></maths> In the white extraction unit 13 described above, each of the gamma-converted R, G, and B data R<sub>γ</sub>, G<sub>γ</sub>, B<sub>γ</sub> The minimum value and a46<sup>γ</sup>(In the case of 64 gradations) The gradation is displayed by extracting the white component by comparing with the value and providing the extracted white component to the data determination unit 14.
However, omitting the above-mentioned comparison process, as shown in FIG. 6, the gamma-converted R, G, and B data R respectively.<sub>γ</sub>, G<sub>γ</sub>, B<sub>γ</sub>The gradation can be displayed by defining the minimum value among them as a white component and providing it to the data determination unit 14.
The pixel arrangement for embodying four colors in the organic electroluminescent display device according to the present invention will be described.
9 to 11 are drawings for showing the pixel arrangement for embodying four colors in the organic electroluminescent display device according to the present invention.
In Figure 9, the red, green, blue, and white sub-pixels for four-color realization are each formed in a striped shape, defining one pixel. That is, one pixel is generally defined by three R, G, and B subpixels, but according to the present invention, a display device is provided by adding a W subpixel that outputs white light in addition to the RGB subpixel described above. Brightness can be increased.
Although the drawings show that the R, G, B, and W subpixels each have the same area, they can be configured to have different areas from each other. Of course, at this time, it is desirable to make the intervals between the data wiring and the gate wiring connected to the switching transistor and the current supply transistor corresponding to the R, G, B, and W subpixels different, and even if they remain the same, they can be used. Is also possible.
In Fig. 10, each of the red, green, blue, and white subpixels is formed in a 2 * 2 grid shape to define one pixel.
Figure 11 shows the red, green, blue, and white subpixels, which have two red subpixels R1, R2 and two green subpixels G1 and G2 for red and green, and two for blue and white. Each has a blue subpixel B and a white subpixel W, and one pixel is defined by a 2 * 3 grid shape. In the drawing, when arranging the subpixels in the above-mentioned 2 * 3 grid shape, the two red and green subpixels are arranged so as to be separated from each other in order to avoid adjacent subpixels of the same color. However, it is also possible to place subpixels of the same color adjacent to each other.
Various examples of the organic electroluminescent display device for displaying the four-color RGBW gradation data generated by the present invention will be described with reference to the drawings attached.
FIG. 12 is a diagram for showing an organic electroluminescent display device according to the first embodiment of the present invention, and particularly shows an independent electroluminescent type organic electroluminescent display device and a bottom light emitting type organic electroluminescent display device.
As shown in FIG. 12, the insulating film 110 is formed on the substrate 105. Here, the substrate 105 is a transparent substrate, and typical examples of a transparent substrate that can be used as such a substrate include a glass substrate, a quartz substrate, a glass ceramic substrate, and a crystalline glass substrate. Further, it is preferable that the substrate material has resistance to a high processing temperature during the manufacturing process.
Further, the insulating film 110 is effective when a substrate containing moving ions or a substrate having conductivity is used. When a quartz substrate is used as the substrate, the insulating film 110 is not required. Further, as the insulating film 110, an insulating film containing silicon can also be used. At this time, it is desirable that the silicon-containing insulating film is an insulating film containing oxygen or nitrogen such that the ratio contained in silicon is a given value, or an insulating film containing both. Specific examples include a silicon oxide film, a silicon nitride film, or a silicon oxide nitride film (a compound represented by SiOxNy, where x and y are arbitrary integers).
The current control transistor formed on the insulating film 110 is formed on an active layer (or active layer) including a source region 112, a channel forming region 114, and a drain region 116, and is formed on the active layer to expose the source region 112 and the drain region 116. Gate insulating film 120, gate electrode 125 formed on the gate insulating film 120, first interlayer insulating film 127 formed on the gate electrode 125 and the gate insulating film 120 and exposing the source region 112 and the drain region 116, the first interlayer It includes a source electrode 130 formed on the insulating film 127 and connected to the source region, and a drain electrode 135 formed on the first interlayer insulating film 127 and connected to the drain region.
Although the gate electrode 125 has a single gate structure in the drawing, it can also have a double or triple gate structure. The source electrode 130 extends from the source wiring extending in the first direction, and the drain electrode 135 extends from the drain wiring extending in the second direction, which is different from the first direction. Although not shown, a drain region of a switching transistor (not shown) is connected to the gate of the current control transistor. In particular, the gate electrode 125 of the current control transistor is electrically connected to the drain region of the switching transistor through the drain wiring, and the source wiring is connected to a power supply line (not shown).
A second interlayer insulating film 140 is formed on the source electrode 130 extended from the source wiring, on the drain electrode 135 extended from the drain wiring, and on the first interlayer insulating film 127.
The pixel electrode 145 is made of a conductive oxide and is connected to the drain electrode 135 of the current control transistor provided in the lower part via a hole in which the second interlayer insulating film 140 is opened. A partition wall 150 that defines a light emitting region is formed on the pixel electrode 145.
On the pixel electrode 145 exposed by the partition 150 and the region where the partition 150 is not formed, the R organic light emitting layer 16R that emits R light, the G organic light emitting layer 16G that emits G light, and the B organic light emitting that emits B light Layer 16B and W organic light emitting layer 16W that emits W light are formed. The R organic light emitting layer, the G organic light emitting layer, the B organic light emitting layer, and the W organic light emitting layer can each have a single layer structure or a laminated structure.
The RGBW organic light emitting layer can have even better luminous efficiency when formed in a laminated structure. Generally, the organic light emitting layer can be formed by forming a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer in this order on the pixel electrode 145. Instead of this structure, the organic light emitting layer has a laminated structure in which a hole transport layer, a light emitting layer and an electron transport layer are formed in this order, or a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer and an electron transport layer. Can be a laminated structure formed in this order.
The metal electrode 170 is formed on the R, G, B, W organic light emitting layer, performs the function of protecting the R, G, B, W organic light emitting layer from external moisture, etc., and at the same time operates as the cathode of the organic light emitting layer. To do.
Although it is shown in the drawing that a metal electrode 170 is formed on the RGBW organic light emitting layer to perform an operation on the cathode, a substance containing magnesium, lithium and calcium having a low work function on the RGBW organic light emitting layer. It is also possible to form a cathode and use it as a cathode to protect the cathode from external moisture and the like, and to form a protective electrode for connecting the cathode of each pixel to another cathode.
According to the first embodiment of the present invention described above, an organic electroluminescent display device having an independent light emitting method and a bottom light emitting method emits W light in addition to an organic light emitting layer that emits R, G, and B light, respectively. By further forming the layer, the brightness of the organic electroluminescent display device can be improved, thereby improving the light efficiency. In addition, it is possible to reduce power consumption by improving the optical efficiency described above.
In the first embodiment of the present invention described above, R, G, B, and W light is transmitted to a substrate by forming a metal electrode that performs a cathode function on an organic light emitting layer that emits R, G, B, and W light, respectively. The bottom light emitting method that emits light through 105 has been described. However, it can also be applied to an organic electroluminescent display device that employs the top emission method as in the second embodiment of the present invention described below.
FIG. 13 is a drawing for showing an organic electroluminescent display device according to a second embodiment of the present invention, and particularly shows an independent electroluminescent type and a top light emitting type organic electroluminescent display device.
As shown in FIG. 13, the insulating film 210 is formed on the substrate 205, and the current control transistor is formed on the insulating film 210. At this time, the current control transistor is formed on the source region 212, the channel forming region 214, the active layer including the drain region 216, and the gate insulating film 220 and the gate insulating film 220 formed on the active layer to expose the source region 212 and the drain region 216. The gate electrode 225 formed on the gate electrode 225, the first interlayer insulating film 227 formed on the gate electrode 225 and the gate insulating film to expose the source region 212 and the drain region 216, and the first interlayer insulating film 227 formed on the first interlayer insulating film 227 and connected to the source region. The source electrode 230 to be formed and the drain electrode 235 formed on the first interlayer insulating film 227 and connected to the drain region are included.
A second interlayer insulating film 240 is formed on the source electrode 230 extended from the source wiring, on the drain electrode 235 extended from the drain wiring, and on the first interlayer insulating film 227.
The pixel electrode 245 is made of a conductive oxide and is connected to the drain electrode 235 of the current control transistor provided at the lower part via a hole formed in the second interlayer insulating film 240. A partition wall 250 that defines the light emitting region is formed on the pixel electrode 245.
On the partition 250 and the pixel electrode 245 exposed by the region where the partition 250 is not formed, the R organic light emitting layer 26R that emits R light, the G organic light emitting layer 26G that emits G light, and B light are emitted. B Organic light emitting layer 26B and W organic light emitting layer 26W that emits W light are formed. The R organic light emitting layer 26R, the G organic light emitting layer 26G, the B organic light emitting layer 26B, and the W organic light emitting layer 26W can each have a single layer structure or a laminated structure.
The transparent electrode 270 is formed on the R, G, B, W organic light emitting layers 26R, 26G, 26B, 26W and operates as a cathode. Further, the transparent protective layer 280 protects the transparent electrode 270 from external moisture and the like.
According to the second embodiment of the present invention described above, an organic electroluminescent display device having an independent light emitting method and a top light emitting method emits white light in addition to an organic light emitting layer that emits red, green, and blue light, respectively. By further forming the layer, the brightness of the organic electroluminescent display device can be improved, thereby improving the light efficiency. In addition, power consumption can be reduced by improving the optical efficiency described above.
In the first and second embodiments of the present invention described above, organic electroluminescent layers that emit light of each of the four colors R, G, B, and W are independently formed on the substrate, and organic electroluminescence having high resolution is achieved. The display device has been described. However, in order to adopt the above-mentioned independent electroluminescence display device for an organic electroluminescent display device, there is a disadvantage that the RGBW material must be vapor-deposited and patterned using a separate shadow mask.
In the third and fourth embodiments described below, an organic electroluminescent display device having a color filter method that employs a photolithography method capable of obtaining a high-resolution display panel without adopting the shadow mask process described above. explain.
FIG. 14 is a drawing for showing an organic electroluminescent display device according to a third embodiment of the present invention, and particularly shows a color filter and a bottom light emitting type organic electroluminescent display device.
As shown in FIG. 14, the insulating film 310 is formed on the substrate 305, and the current control transistor is formed on the insulating film 310. At this time, the current control transistor is formed on the source region 312, the channel forming region 314, the active layer including the drain region 316, and the gate insulating film 320 and the gate insulating film 320 formed on the active layer to expose the source region 312 and the drain region 316. Formed on the gate electrode 325, the gate electrode 325 and the gate insulating film 320 to expose the source region 312 and the drain region 316, and the first interlayer insulating film 327 formed on the first interlayer insulating film 327. It includes a source electrode 330 to be connected and a drain electrode 335 formed on the first interlayer insulating film 327 and connected to the drain region.
A color pixel layer 340 is formed on the source electrode 330 extended from the source wiring, on the drain electrode 335 extended from the drain wiring, and on the first interlayer insulating film 327. At this time, the color pixel layer 340 is composed of an R red color filter, a G green color filter, a B blue color filter, and a W white color filter, and each color filter is formed on a region defined by one current control transistor. ..
A flattening film 342 is formed on each color filter. The flattening film 342 is for flattening each color filter, and a desirable substance is an organic resin film such as a polyimide film, a polyamide film, an acrylic film, or a BCB film. The above-mentioned organic resin film has an advantage that a flat surface is easily formed and the relative permittivity is low.
The pixel electrode 345 is made of a conductive oxide and is connected to the drain electrode 335 of the current control transistor provided at the lower part via a hole provided in the flattening film 342 and the color pixel layer 340. On the pixel electrode 345, a partition wall 350 that defines different R, G, B, and W light emitting regions is formed.
An EL layer 360, preferably a white organic light emitting layer, is formed on the partition wall 350 and the pixel electrode 345 exposed in the region where the partition wall 350 is not formed.
The metal electrode 370 is formed on the white organic light emitting layer 360, performs a function of protecting the white organic light emitting layer 360 from external moisture and the like, and at the same time operates as a cathode of the EL element.
In the drawing, it is shown that a metal electrode is formed on the white organic light emitting layer 360 to perform an operation to the cathode, but a substance containing magnesium, lithium and calcium having a low work function on the white organic light emitting layer 360. Can be formed and used as a cathode to protect the cathode from external moisture and the like, and a protective electrode for connecting the cathode of each pixel to another cathode can be formed.
In FIG. 14 described above, it is illustrated that a W white color filter made of a transparent material is formed in order to emit W light, but the W white color filter described above may be omitted. Of course, when the above-mentioned W white color filter is omitted, it is desirable to form the second interlayer insulating film 342 thinly on the W white pixel.
According to the third embodiment of the present invention described above, in an organic electroluminescent display device that employs a color filter and a bottom emission method, a red, green, or blue color filter is used between the plane on which the current control transistor is formed and the EL layer. In addition, by further forming a white color filter, the brightness of the organic electroluminescent display device can be improved, thereby improving the light efficiency. In addition, power consumption can be reduced by improving the optical efficiency described above.
FIG. 15 is a drawing for showing an organic electroluminescent display device according to a fourth embodiment of the present invention, and particularly illustrates a color filter and a top-emitting organic electroluminescent display device.
As shown in FIG. 15, the insulating film 140 is formed on the substrate 405, and the current control transistor is formed on the insulating film 410. At this time, the current control transistor is formed on the source region 412, the channel forming region 414, the active layer including the drain region 416, and the gate insulating film 420 and the gate insulating film 420 formed on the active layer to expose the source region 412 and the drain region 416. Formed on the gate electrode 425, the gate electrode 425 and the gate insulating film 420, and exposed on the source region 412 and the drain region 416, the first interlayer insulating film 427 and the first interlayer insulating film 427 are formed in the source region. It includes a source electrode 430 to be connected and a drain electrode 435 formed on the first interlayer insulating film 427 and connected to the drain region.
A second interlayer insulating film 440 is formed on the first interlayer insulating film 427, and the source electrode 430 and the drain electrode 435 are exposed.
A second interlayer insulating film 440 is formed on the source electrode 430 extended from the source wiring, on the drain electrode 435 extended from the drain wiring, and on the first interlayer insulating film 427.
The pixel electrode 445 is made of a conductive oxide and is connected to the drain electrode 435 of the current control transistor provided at the bottom via a hole provided in the second interlayer insulating film 440. A partition wall 450 that defines different R, G, B, and W light emitting regions is formed on the pixel electrode 445.
An EL layer 460, preferably a white organic light emitting layer, is formed on the pixel electrode 445 exposed by the partition wall 450 and the region where the partition wall 450 is not formed. The white organic light emitting layer 460 may have a single layer structure or a laminated structure.
The transparent electrode 470 is formed on the white organic light emitting layer 460 and operates as a cathode, and the transparent protective layer 480 protects the transparent electrode 270 from external moisture and the like.
The color pixel layer 490 consists of an R red color filter, a G green color filter, a B blue color filter, and a W white color filter, and each color filter is formed so as to correspond to a region defined by one current control transistor. ..
According to the fourth embodiment of the present invention described above, in the organic electroluminescence display device adopting the color filter and the top emission method, white in addition to the red, green, and blue color filters between the plane on which the current control transistor is formed and the EL layer. By further forming the color filter, the brightness of the organic electroluminescent display device can be improved, and thus the light efficiency can be improved. In addition, power consumption can be reduced by improving the optical efficiency described above.
Further, in the case of the top light emitting method, the aperture ratio can be improved by forming a transparent protective layer after forming the EL element and forming a color filter on the transparent protective layer, and higher resolution is possible as compared with the bottom light emitting method. ..
As described above, the initial RGB gradation data according to the present invention can be converted into the corrected RGBW gradation data to increase the brightness or light efficiency of the display device. That is, when generating corrected RGBW gradation data having a white component extracted from the initial RGB gradation data, the processing bits of the data drive IC are expanded to process the expanded gray scale, and each floor of the corrected RGBW gradation data is expanded. Even if the toning level is close to pure color, it is possible to prevent a decrease in brightness.
On the other hand, when generating corrected RGBW gradation data that has a white component extracted from the initial RGB gradation data, if the level of each corrected RGBW gradation data is close to pure color, the gray scale is fixed to 1 to prevent brightness reduction. can do.
The present invention has been described in detail by way of examples of the present invention, but the present invention is not limited to this, and any person who has ordinary knowledge in the technical field to which the present invention belongs does not depart from the idea and spirit of the present invention. The invention can be modified or modified.
<figref num="1">It is a figure for demonstrating a general four-color drive.</figref><figref num="2">It is a figure for demonstrating the four-color drive by this invention.</figref><figref num="3">It is a figure for demonstrating the organic electroluminescence display device by this invention.</figref><figref num="4">It is a figure for demonstrating an example of the four-color conversion part illustrated in FIG.</figref><figref num="5">It is a figure for demonstrating operation of a white extraction part.</figref><figref num="6">It is a figure for demonstrating operation of a white extraction part.</figref><figref num="7">It is a figure for demonstrating another example of the four-color conversion part illustrated in FIG.</figref><figref num="8">It is a gamma curve for explaining the gamma characteristic by gradation.</figref><figref num="9">It is a figure for demonstrating the pixel arrangement for embodying four colors in the organic electroluminescence display device by this invention.</figref><figref num="10">It is a figure for demonstrating the pixel arrangement for embodying four colors in the organic electroluminescence display device by this invention.</figref><figref num="11">It is a figure for demonstrating the pixel arrangement for embodying four colors in the organic electroluminescence display device by this invention.</figref><figref num="12">It is a figure for demonstrating the organic electroluminescence display device according to 1st Example of this invention.</figref><figref num="13">It is a figure for demonstrating the organic electroluminescence display device according to 2nd Example of this invention.</figref><figref num="14">It is a figure for demonstrating the organic electroluminescence display device according to 3rd Example of this invention.</figref><figref num="15">It is a figure for demonstrating the organic electroluminescence display device according to 4th Example of this invention.</figref>
Code description
10 4 color converter 11,16 Gamma converter 12 Relocation section 13,17 White extractor 14,18 Data confirmation part 15,19 Inverse gamma converter 20 Data drive unit 30 Scan drive 40 Organic electroluminescent panel 125 Gate electrode 130 source electrode 135 drain electrode 145,245,345,445 Pixel electrode 150,250,350,450 bulkhead 360,460 White organic light emitting layer 16R, 26R Red organic light emitting layer 16G, 26G green organic light emitting layer 16B, 26B blue organic light emitting layer 170,370 metal electrodes 280,480 protective layer 270,470 transparent electrode
Every citation, both ways
| Document | Relation | Office |
|---|---|---|
| JP05241551A | Cites | Japan |
| JP11098521A | Cites | Japan |
| JP08087242A | Cites | Japan |
| JP02270078A | Cites | Japan |
| JP11146349A | Cites | Japan |
| JP2003108068A | Cites | Japan |
| JP2003043995A | Cites | Japan |
| JP2001147666A | Cites | Japan |
| JP2000200061A | Cites | Japan |
| JP2002149116A | Cites | Japan |
| JP2002132218A | Cites | Japan |
| JP2006512732A | Cites | Japan |
| JP2001290439A | Cites | Japan |
15 members in 6 offices
Priority claims5
| Document | Office | Kind | Date |
|---|---|---|---|
| 2003029153 | Republic of Korea | – | |
| 20030029153 | Republic of Korea | A | |
| 20030029153 | Republic of Korea | A | |
| 2003200329153 | – | – | – |
| KR20030029153 | – | – | – |
Members15
| Document | Office | Kind | |
|---|---|---|---|
| EP1475771A2 | European Patent Office (EPO) | A2 | |
| US2004222999A1 | United States of America | A1 | |
| KR20040096273A | Republic of Korea | A | |
| TW200424952A | Taiwan Province of China | A | |
| JP2004334199A | Japan | A | |
| CN1551707A | China | A | |
| EP1475771A3 | European Patent Office (EPO) | A3 | |
| EP1947632A2 | European Patent Office (EPO) | A2 | |
| EP1947632A3 | European Patent Office (EPO) | A3 | |
| KR100943273B1 | Republic of Korea | B1 | |
| US7705810B2 | United States of America | B2 | |
| CN1551707B | China | B | |
| JP4944366B2This record | Japan | B2 | |
| EP1475771B1 | European Patent Office (EPO) | B1 | |
| EP1947632B1 | European Patent Office (EPO) | B1 |
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Numbers
- Publication
- 4944366
- Publication, DOCDB
- 4944366
- Publication, EPODOC
- JP4944366B
- Application
- 131099
- Application, DOCDB
- 2004131099
- Application, EPODOC
- JP20040131099
Titles2
- Japanese
- 4色変換方法及びその装置とこれを用いた有機電界発光表示装置
- English
- 4 color conversion method and its device and organic electroluminescence display device using it
Classification
- CPC, 9
- G09G3/3233
- G09G3/30
- G09G3/3225
- G09G2300/0452
- G09G2300/0842
- G09G2320/0276
- G09G2340/06
- H10K59/351
- H10K59/38
- IPC, 7
- G09G3 30
- G09G3 20
- G09G5 02
- H05B33 12
- H01L51 50
- G09G3 32
- H01L27 32