JPH1039791A - Organic electroluminescence display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an org. electroluminescence display device capable of maintaining luminance balance of red, blue and green without collapse over a long time. SOLUTION: The luminance ratios of respective emitted colors are controlled by changing the area ratios of respective color light emitting parts R, B, G of the red, blue and green. The areas of the respective color light emitting parts are so controlled that the luminance of the respective color light emitting parts attains the luminance ratios respectively attaining desired white balance values when the same driving voltage is impressed on the respective color light emitting parts, full color are displayed by controlling the time width of the driving voltage to each of the respective color light emitting parts. The respective color light emitting parts are mosaically arranged to the shape of a square with a cross inside. Two pieces of the light emitting parts of any one color among the red, blue and green are arranged on one diagonal line of the shape of the square with the cross inside and the light emitting parts of the remaining two colors are arranged by one piece each on the other diagonal line of the shape of the square with the cross inside. Any of the light emitting parts is divided to plural pieces of the light emitting parts and non-light emitting parts are arranged in the central parts of the light emitting parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an organic electroluminescence display device (organic ELD) using an organic electroluminescence device (organic EL device).

[0002]

2. Description of the Related Art An EL element is an element which emits light by being excited by applying a voltage to a fluorescent compound. Depending on the luminescent material, it is classified into an inorganic EL using an inorganic compound and an organic EL using an organic compound. A display using an inorganic EL (inorganic ELD) is partially put into practical use, and a display using an organic EL (organic ELD) is being put to practical use.

[0003] Among them, the organic EL is disclosed, for example, in JP-A-6-99
No. 53 and publications (IEICE, IEICE, OME94-80 (1995-03), pp. 13-18 "Doping into blue light emitting devices", Idemitsu Kosan Nakamura et al.) According to the invention of a blue organic EL element that emits light with high luminance, a material called a color conversion material (for example, a pigment or a phosphor) is used to convert high-energy blue to low-energy green and red (convert wavelength). 3), three primary colors can be obtained, and by arranging these red, green, and blue pixels two-dimensionally, a display can be configured and an image can be displayed. The color conversion material is described in, for example, JP-A-5-258860, and the color conversion by wavelength conversion is described in, for example, a publication (ASIA DISPL).
AY '95, Performance of RGB Multi-Color Organic EL
DIsplay Idemitsu Kosan).

Hereinafter, a conventional display device using the above-mentioned blue organic EL device will be described with reference to the drawings. FIG. 8A is a front view showing a display surface of a conventional organic ELD, and FIG. 8B is a cross-sectional view taken along a line A in FIG. In the figure, 1 is a display surface side transparent substrate, 2r and 2g are color conversion filters for converting the wavelength of blue to red and green, respectively.
Is a protective layer, 4 is a transparent electrode (anode), 5 is a light emitting layer (organic E
L, 6 is a back electrode (cathode), 7 is a back substrate, 8 is a black matrix, R, G, and B are red,
The green and blue light emitting units are shown. In FIG. 8A, for the sake of clarity, different color light emitting portions R, G, and B are shown with different hatchings, and the same applies to the following drawings. In brief, the structure is as follows. First, a black matrix 8 is formed on the display-side transparent substrate 1, color conversion filters 2r and 2g are formed in a stripe shape, and the color conversion filters 2r and 2g are transparent to reduce unevenness. A protective layer 3 made of a material is formed, and then an anode 4 (a transparent electrode such as ITO) is formed in a stripe shape so as to overlap the stripes of the color conversion filters 2r and 2g. On this surface, a light emitting layer 5 (single layer or multilayer) is formed on one surface by vapor deposition or spin coating, and a back electrode 6 (cathode) is formed in a stripe shape so as to be orthogonal to the anode 4. The back substrate 7 is sequentially bonded. Here, the light-emitting layer 5 is usually made of one or more kinds of organic light-emitting materials, but the organic light-emitting material, the hole transport material, and the electron injection material are formed as a single substance or a mixture.

[0005]

In the organic EL display device having the above-mentioned structure, blue light emitted from the light emitting layer 5 and green and red light obtained by wavelength-converting the blue light emitted by the color conversion filters 2g and 2r are used. Therefore, the luminance of red and green decreases, and the ratio of the luminous efficiencies of red, green, and blue, including the visual characteristics, is, for example, as described in the above publication (ASIA DISPLAY '95, Perfo
According to rmance of RGB Multi-Color Organic EL Display (Idemitsu Kosan), it is described that red: green: blue = 0.3: 1.2: 1. For this reason, in the organic EL display having this configuration, when red, green, and blue are illuminated with the same area and the same voltage, red is the weakest, the white balance is distorted, and bluish white is not obtained, and a beautiful full-color display is not performed. In order to obtain white at the target coordinate point on the CIE standard coordinates, it is necessary to balance the luminance. So red,
When the areas of the green and blue light emitting parts are the same, one method of balancing the luminance is to adjust the luminance by applying different voltages to the red, green and blue light emitting parts. However, in the case of the organic EL element, the luminescence life is largely dependent on the amount of injected current.
Since the amount of injected current for green and blue differs depending on the color, that is, the speed of deterioration of luminance differs depending on the color, the white balance deteriorates with time.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an organic ELD capable of maintaining the luminance balance of each of red, green and blue colors without being destroyed for a long time.

[0007]

The organic electroluminescent display device according to the present invention controls the luminance ratio of each of the above-mentioned luminescent colors by changing the area ratio of the red, blue and green light emitting portions.

In addition, the area of each color light emitting unit is controlled so that the luminance of each color light emitting unit has a desired white balance value when the same driving voltage is applied to each color light emitting unit. By controlling the time width of the drive voltage for each color light emitting portion, a full color display is realized.

Further, the respective color light emitting portions are arranged in a mosaic arrangement in a cross shape, and any one of red, blue and green is used.
Two color light-emitting portions are arranged on one diagonal of the cross, and the remaining two light-emitting portions are arranged one on the other diagonal of the cross.

[0010] Further, any one of the light emitting portions is divided into a plurality of light emitting portions.

Further, a non-light emitting portion is arranged at the center of any of the light emitting portions.

Further, the light-emitting portions of the respective colors are arranged in a trio in a stripe shape, and the light-emitting portion having the smallest area is arranged at the center.

Further, any one of the above light emitting units is provided with a color absorption type filter.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. The organic electroluminescence display device of the present invention, from the luminous efficiency and the target coordinate point of white display,
Luminance is balanced by determining the area of each of the red, green, and blue light emitting units (which constitute pixels). To determine this area ratio, first, from the red, green, and blue chromaticity coordinate points,
Calculate the luminance ratio. The target chromaticity coordinate points of the white display are ( _xw , _yw ), and the red, green, and blue chromaticity coordinate points observed on the display surface are ( _xr , _yr ), ( _xg , _yg ), respectively. ,
(X _b, y _b), the red on the display surface, green, blue luminance ratio P _r: P _g: When 1 to, P _r, P _g is represented by the following formula (1) (2).

[0015]

(Equation 1)

From the luminance ratio, assuming that the ratio of the luminous efficiency of red, green, and blue is R: G: 1, the area ratio of the light-emitting portions of each color.
S _r : S _g : S _b is represented by the following equation. S _r : S _g : S _b = P _r / R: P _g / G: 1/1 By forming the light-emitting portions of each color with the area ratio obtained by this, the voltage value is changed for each color. Not
An organic electroluminescent display device for obtaining a white target chromaticity coordinate point is provided. For example, in the case where the luminance ratio is set to red: green: blue = 2: 7: 1 (this luminance ratio is often adopted in a CRT), the luminous efficiency of each color light emitting unit is the same as in the conventional example. When green: blue = 0.3: 1.2: 1, the area ratio of each light emitting part is red: green: blue
= 2 / 0.3: 7 / 1.2: 1/1 = 6.67: 5.83: 1.

Hereinafter, the organic ELD according to the present embodiment will be described in more detail. FIG. 1 shows a main part of an organic ELD according to an embodiment of the present invention, (a) is a plan view of a display surface,
(B) is a cross-sectional view of a portion of line (a) in (a). In the figure, 1 is a display surface side transparent substrate, 2r and 2g are color conversion filters for converting the wavelength of blue light into red and green light respectively, 3 is a protective layer, 4 is a transparent electrode (anode), and 5 is a light emitting layer (organic EL). Layer), 6 is a back electrode (cathode), 7 is a back substrate, and 8 is a black matrix, which is the same as the conventional example. R, G, and B indicate red, green, and blue light emitting units, respectively. The areas of the red, green, and blue light emitting portions R, G, and B are determined so as to be a desired white chromaticity coordinate point. That is, as described above, the luminous efficiency of the red, green, and blue light emitting units R, G, and B is 0.3: 1.2: 1, and in the case of the above-described ordinary CRT, the luminance ratio of red, green, and blue is 2: 7. : 1, the white chromaticity coordinate points are determined, and the red, green, and blue light emitting units R, G, and B
Are configured to have an area ratio of 6.67: 5.83: 1. As described above, the luminance ratio is controlled by changing the size of each color light emitting unit R, G, B according to the light emitting color based on the light emitting efficiency of each color light emitting unit, and each color light emitting unit is driven by the same drive voltage to achieve the desired driving. Can be obtained.

Next, the manufacturing method will be described. For example, a black matrix 8 is formed on a display surface side transparent substrate 1 made of a glass plate, quartz glass, or the like by a printing method or the like, and color conversion filters 2g and 2r for wavelength conversion from blue to green and red are formed by a pigment dispersion method or printing. A protective layer 3 made of a transparent material, for example, polyurethane resin or quartz glass, is covered with a color conversion filter 2g,
The layers are laminated so that the unevenness of 2r is reduced. The color conversion filters 2g and 2r can be selected from organic and inorganic compounds that are known to absorb blue light and emit longer-wavelength visible light. For example, fluorescent 4-dicyanomethylene-4H-pyran and 4-dicyanomethylene-4H-thiopyran are used. As the green conversion filter 2g, a green light-emitting polymethine type disclosed in U.S. Pat. No. 4,769,292 is used. Those containing any of the dyes are used. Specifically, for example, the above-mentioned Japanese Patent Application Laid-Open No. 5-258
The one described in Japanese Patent Publication No. 860 is used. Next, the anode electrode 4 positioned so as to overlap the shapes of the color conversion filters 2g and 2r is formed. The conductor used as the anode electrode 4 is a transparent electrode such as ITO (isodium tin oxide). The electrodes 4 and the protective layer 3 have a thickness of several tens nm to several hundreds μm.
Next, the light emitting layer 5 disposed on the transparent electrode 4 is an organic single layer portion having a bipolar property (a property of transporting both electrons and holes) or a layer having properties of an electron transport layer, a light emitting layer, and a hole transport layer. Is formed of one or more organic multilayer parts. These forming methods differ depending on whether the organic EL material is a low molecular weight or high molecular weight material, but is formed by vacuum heating evaporation, dip coating, spin coating, or the like. In addition, as the light emitting layer 5, specifically, for example, a distyrylbiphenyl derivative having a blue light emitting ability in a solid state represented by the general formula (1) published by Idemitsu Kosan in the aforementioned IEICE Technical Report is used as a host material. The light-emitting layer 5 is obtained by doping the host substance with a blue dye, which is a DSA derivative having a carbazolyl group at a terminal of distyryl arylene (DSA) represented by the general formula (2) for improving luminous efficiency. .

[0019]

Embedded image

After the light emitting layer 5 made of an organic EL material, a low work function metal electrode 6 serving as a cathode is formed by, for example, a vapor deposition method or a sputtering method. Finally, the back substrate 7 is adhered and sealed. The method for manufacturing the organic EL element having such a structure is not particularly limited, and the film can be formed only by a vapor deposition method, and the order of formation can be from the back side. As described above, the anode electrode 4 and the cathode electrode 6 are arranged in a matrix, and the matrix electrodes are operated to sequentially input a video signal, thereby sequentially emitting light and projecting an image.

As described above, since the luminance ratio is adjusted by adjusting the area ratio of the light emitting portions of the respective colors, the injection current density of the light emitting portions can be equalized for each color, and the luminance deterioration characteristics are not biased. No variation occurs. That is, it is possible to prevent the life of the product from being shortened due to the deviation of the color balance. Further, the fact that the drive voltage is constant can simplify the drive circuit and the drive power supply. The light was emitted from the transparent electrode 4
This occurs at the intersection of the transparent electrode 4 and the back electrode 6. Therefore, in order to change the area ratio of each color light emitting portion, any one of the transparent electrode 4 and the back electrode 6 may be changed.

In the organic ELD, when it is desired to display an arbitrary color, the same voltage is applied to each color light emitting portion for displaying red, green, and blue, and the application time width of the red, green, and blue is controlled. Thus, the respective colors are added and mixed to display an arbitrary color. By increasing the number of gradations of this application time width, beautiful full-color display can be achieved.

Embodiment 2 FIG. In the first embodiment, the blue light-emitting portions B having a minimum area and a thin line are arranged at the ends in order to arrange the respective color light-emitting portions R, G, and B in a stripe-like trio, but as shown in FIG. Is located at the center, the distance between the luminescent colors becomes shorter when the luminescent colors at both ends are emitted at the same time, that is, the pitch of the light and shade becomes small, so that the image has a glare. Can be reduced.

Embodiment 3 FIG. 3A and 3B show a main part of an organic ELD according to another embodiment of the present invention, wherein FIG. 3A is a plan view of a display surface, and FIG. 3B is an explanatory diagram for explaining a configuration of a transparent electrode 4 and a back electrode 6. . For clarity, one electrode 6 is shown with hatching. Light emitting units R, G, B of three colors
Are arranged in two rows, one row is composed of one color of red, and the remaining one row is composed of two colors of green and blue. The area ratio here is the same as in the first embodiment.
This is a size at which the same white chromaticity coordinates as can be obtained. That is, the area ratio of the red, green, and blue light emitting units R, G, and B is 6.67: 5.83: 1. For example, in the case of the light emitting unit configuration shown in FIG.
As shown in the figure, the scanning electrodes Y1 (a) and Y1 (b) and the signal electrode X1 (a)
It becomes n, and Y1 (a) and X1 (b) are turned ON to emit green G, and Y1 (b) and X1 (b) are turned ON to emit blue B. Although FIG. 2 shows a case where the transparent electrode 4 is a signal electrode and the back electrode 6 is a scanning electrode, the reverse may be adopted.

With this arrangement, the shape of each light emitting portion approaches a square, so that the size of the line width can be increased. For example, in the case of the same pixel pitch, each light-emitting portion of three vertical lines arranged in a trio in a stripe shape is 50 μm
In this case, the width can be increased by 1.5 times to a width of 75 μm. As a result, the line width of the color conversion filter and the color filter described in detail later is widened, so that the production accuracy by printing or the like can be easily adjusted. Further, similarly to the first embodiment, there are effects of uniformity of luminance deterioration and simplification of a circuit.

Embodiment 4 4A and 4B show a main part of an organic ELD according to another embodiment of the present invention, wherein FIG. 4A is a plan view of a display surface, and FIG. 4B is an enlarged plan view of a portion surrounded by a solid line in FIG. . The light-emitting portions R, G, and B of each color are mosaic-arranged in a cross, and two light-emitting portions G of one color are arranged on one diagonal of the cross, and the light-emitting portions R and B of the remaining two colors are cross-shaped. Are arranged one by one on the other diagonal line. The area of these light emitting units may be configured in the same area ratio as that of the first embodiment, that is, red: green: blue = 6.67: 5.83: 1, but in FIG. The biggest. By doing so, the white balance is slightly distorted, but there is an effect that the light emission luminance increases in consideration of human visual characteristics. Also, in the case of this structure, if red, green, green, and blue are one pixel (solid-line portion) in the still image, adjacent pixels overlap (wave-line-enclosed portion), and the actual number of pixels is approximately doubled. . That is, the mosaic arrangement is more advantageous in obtaining high image quality than the pixel shape of the trio arrangement as described in the first embodiment. Further, as shown in FIG. 4B, it is also possible to enlarge the light emitting area in the direction of the arrow for each light emitting unit at an appropriate enlargement ratio, and it is possible to obtain high luminance without deteriorating the image quality. Also, in the case of this shape, as in the above-described embodiments, there are effects of ease of manufacturing, uniformity of luminance deterioration, and simplification of the circuit.

Embodiment 5 FIG. 5A and 5B show a main part of an organic ELD according to another embodiment of the present invention, wherein FIG. 5A is a plan view of a display surface, and FIGS. 5B and 5C are enlarged views of a portion surrounded by a solid line in FIG. FIG. 4D is a plan view, and FIG. 4D is an explanatory diagram illustrating a configuration of a transparent electrode and a back electrode. One electrode is hatched for clarity. In order to realize a mosaic arrangement of the light emitting units having the same size, the light emitting units are further divided in one light emitting unit and have the same area ratio. FIG. 5B shows a shape in which the green and blue light-emitting portions G and B are divided into a plurality of light-emitting portions (one color pixel is divided by a small square), and FIG. 5C shows green and blue light-emitting portions G and B.
And a non-light-emitting portion is disposed at the center of the pixel (a portion of one color pixel is omitted). In both cases, the area ratio for obtaining the target coordinate point (for example, red: green: blue =
6.67: 5.83: 1). As described in the above embodiments, the area ratio of the red, green, and blue light emitting portions is 1: 1:
When the shape is not 1, the image looks rough when viewed from a short distance. Therefore, by adopting the shape shown in this embodiment, the imbalance of the area ratio (for example, red: green: blue = 6.67: 5.83: 1) can be reduced, and the roughness can be reduced. Here, the transparent electrode 4 and the back electrode 6 used in FIGS. 5B and 5C are configured as shown in FIG.
Each of the small light emitting portions drawn in (b) and (c) is arranged in a dotted line on the intersection of the transparent electrode 4 and the back electrode 6, and is provided between the small light emitting portions in (b) and the light emission in (c). The non-light-emitting part in the center of the part is a black material (black matrix)
It consists of. For example, in the case of the light emitting unit configuration shown in FIGS. 5B and 5C, to emit red R, the scanning electrode Y1 (b) and the signal electrode X1 (a) are turned on as shown in FIG. 5D. , And to illuminate green G, Y1 (a) and X1 (a), and Y1 (b) and X1 (b)
Is turned on, and Y1 (a) and X1 (b) are turned on to emit blue B light. Although FIG. 2 shows a case where the transparent electrode 4 is a signal electrode and the back electrode 6 is a scanning electrode, the reverse may be adopted.

Embodiment 6 FIG. 6A and 6B show a main part of an organic ELD according to another embodiment of the present invention, wherein FIG. 6A is a plan view of a display surface, and FIGS. 6B and 6C are enlarged views of a portion surrounded by a solid line in FIG. It is a top view. In the present embodiment, the trios are arranged in stripes, and FIG. 6B shows a shape in which the blue light emitting portion B is divided into a plurality of light emitting portions.
(C) shows a shape in which a non-light emitting portion is arranged at the center of the blue light emitting portion B. When the area ratio is the same as that of the first embodiment, red: green: blue = 6.67: 5.83: 1, and the difference in area between the red light emitting portion R and the green light emitting portion G is small. The area of the light emitting unit is changed as in the first embodiment without division. Even with such a configuration, the feeling of roughness can be reduced as in the fifth embodiment.

Embodiment 7 FIGS. 7A to 7C are cross-sectional views each showing a main part of an organic ELD according to another embodiment of the present invention. FIG. 7A shows a case in which a blue color filter 9b (color absorption type filter) having a low transmittance is provided in order to match the blue light emission efficiency with the red or green light emission efficiency, and the area ratio of each color light emitting portion is shown. By using the blue color filter 9b to emit light with the same injection current amount by changing the area ratio, the area ratio of the blue light emitting portion does not need to be extremely small as compared with the other light emitting portions as in the above embodiments. Also, a desired luminance ratio can be obtained, the imbalance of the area ratio can be reduced, and the feeling of roughness can be reduced. Further, since it becomes difficult to reflect external light, the contrast is also improved. It is also possible to use a filter with good color reproducibility.

Furthermore, the use of a color filter is
As shown in FIG. 7B, color filters 9b and 9g can be arranged for two or more colors, not limited to colors. In this case, luminance is reduced, but color reproducibility can be improved. . In addition, the color filters are used in the first to third embodiments.
6 can also be combined.

Further, as shown in FIG.
May emit white light, and the color filters 9r, 9g, 9b provided in the respective color light emitting units R, G, B may convert the white light emission into each color. In this way, when white light is converted into each color by the color filters 9r, 9g, and 9b, the difference in luminous efficiency between the luminescent colors is smaller than when blue light is converted into other colors by the color conversion filters 2r and 2g. But,
A desired luminance ratio is not always obtained, and the luminance ratio can be controlled by changing the area ratio as in the above embodiments. As the color filters 9r, 9g, 9b, dye-type or pigment-dispersion type filters used for color liquid crystal displays are used.

In each of the above embodiments, in order to eliminate the variation in the deterioration of the light emission life, each color light emitting portion R, G, B is driven by the same drive voltage, and the luminance ratio is controlled by changing the area ratio. As described above, for example, the luminance ratio is roughly adjusted by changing the area ratio, and the fine adjustment is performed by changing the drive voltage. May be controlled by changing both. Also in this case, the variation in the deterioration of the light emission lifetime is greatly improved as compared with the case where the luminance ratio is adjusted only by the drive voltage.

Further, the luminance ratio of each color is not limited to red: green: blue = 2: 7: 1 described in the above embodiment, but can be appropriately selected according to desired white.

[0034]

As described above, according to the present invention, red,
Since the luminance ratio of each emission color is controlled by changing the area ratio of each of the blue and green light emission portions, the variation in the deterioration of the emission life is greatly improved as compared with the case where the luminance ratio is adjusted only by the driving voltage, Luminance balance of each color can be maintained without breaking for a long time.

Further, the area of each color light emitting section is controlled so that the luminance of each color light emitting section becomes a luminance ratio to obtain a desired white balance value when the same driving voltage is applied to each color light emitting section. Since the full-color display is configured by controlling the time width of the drive voltage for each color light emitting unit, the drive circuit and the drive power supply can be simplified in addition to the above-described effects.

Further, each of the color light emitting portions is arranged in a mosaic pattern in a cross-shaped manner, and any one of red, blue, and green is used.
By arranging two light emitting portions of color on one diagonal of the cross and one light emitting portion of the remaining two colors on the other diagonal of the cross, the number of pixels is substantially increased, High image quality can be obtained. In addition, there is a margin in manufacturing accuracy.

Further, by dividing any one of the light-emitting portions into a plurality of light-emitting portions, or by disposing a non-light-emitting portion at the center of the light-emitting portion, the imbalance of the area ratio can be reduced, and the distance can be reduced. The roughness of the image when viewed can be reduced.

Further, if the light-emitting portions of the respective colors are arranged in a trio in the form of stripes and the light-emitting portions having the smallest area are arranged at the center, it is possible to reduce the glare of the image.

In addition, by providing a color absorbing filter in any one of the light emitting units, the imbalance in area ratio can be reduced.

[Brief description of the drawings]

FIGS. 1A and 1B show a main part of an organic ELD according to a first embodiment of the present invention, wherein FIG. 1A is a plan view of a display surface, and FIG. 1B is a cross-sectional view taken along a line A in FIG.

FIGS. 2A and 2B show a main part of an organic ELD according to a second embodiment of the present invention, wherein FIG. 2A is a plan view of a display surface, and FIG. 2B is a cross-sectional view taken along a line A in FIG.

FIGS. 3A and 3B show a main part of an organic ELD according to a third embodiment of the present invention, wherein FIG. 3A is a plan view of a display surface, and FIG. 3B is an explanatory diagram for explaining a configuration of a transparent electrode and a back electrode.

4A and 4B show a main part of an organic ELD according to a fourth embodiment of the present invention, wherein FIG. 4A is a plan view of a display surface, and FIG. 4B is an enlarged plan view of a portion surrounded by a solid line in FIG. .

FIGS. 5A and 5B show a main part of an organic ELD according to a fifth embodiment of the present invention, wherein FIG. 5A is a plan view of a display surface, and FIGS. 5B and 5C are enlarged views of a portion surrounded by a solid line in FIG. FIG. 4D is a plan view, and FIG. 4D is an explanatory diagram illustrating a configuration of a transparent electrode and a back electrode.

6A and 6B show a main part of an organic ELD according to a sixth embodiment of the present invention, wherein FIG. 6A is a plan view of a display surface, and FIGS. 6B and 6C are enlarged views of a portion surrounded by a solid line in FIG. It is a top view.

FIG. 7 is a plan view showing a main part of an organic ELD according to a seventh embodiment of the present invention.

8A and 8B show a main part of an organic ELD according to a first embodiment of the related art, wherein FIG. 8A is a plan view of a display surface, and FIG. 8B is a cross-sectional view taken along a line A in FIG.

[Explanation of symbols]

1 display side transparent substrate, 2r, 2g color conversion filter, 4 transparent electrode, 5 light emitting layer, 6 back electrode,
7 back substrate, 8 black matrix, 9g, 9b
Color filter, R red light emitting part, G green light emitting part, B blue light emitting part.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masaki Yamakawa 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Gaku Sato 2-3-2 Marunouchi 3-chome, Chiyoda-ku, Tokyo Rishi Electric Co., Ltd.

Claims (7)

[Claims] 1. An organic electroluminescence display device having red, blue, and green light-emitting portions and displaying full color, wherein the luminance ratio of each color light-emitting portion is controlled by changing the area ratio of each color light-emitting portion. An organic electroluminescence display device characterized by the above-mentioned. 2. An area of each color light emitting unit is controlled such that when the same driving voltage is applied to each color light emitting unit, the luminance of each color light emitting unit has a luminance ratio to obtain a desired white balance value. 2. The organic electroluminescent display device according to claim 1, wherein a full-color display is performed by controlling a time width of the driving voltage for each color light emitting unit. 3. The light emitting portions of each color are arranged in a mosaic pattern in a cross, and two light emitting portions of any one of red, blue, and green remain on one diagonal of the cross. 3. The organic electroluminescent display device according to claim 1, wherein two light emitting units of two colors are arranged one by one on the other diagonal line of the cross. 4. The organic electroluminescent display device according to claim 1, wherein any one of the light emitting portions is divided into a plurality of light emitting portions. 5. The organic electroluminescent display device according to claim 1, wherein a non-light-emitting portion is arranged at a center of any one of the light-emitting portions. 6. The organic electroluminescent display device according to claim 1, wherein the light-emitting portions of the respective colors are arranged in a trio in a stripe shape, and the light-emitting portion having the smallest area is arranged at the center. 7. The organic electroluminescent display device according to claim 1, wherein any one of the light emitting units is provided with a color absorption filter.