JP5939092B2 - Color filter for organic electroluminescence display - Google Patents

Description

  The present invention, when used in an organic electroluminescence display device, can suppress display defects due to sunlight reflection, can perform display with good luminance, and has white display color indoors and under sunlight. Color filter for organic electroluminescence display device capable of reducing change, organic electroluminescence display device using the same, method for designing color filter for organic electroluminescence display device, and color filter for organic electroluminescence display device It relates to a manufacturing method.

  An organic electroluminescence (hereinafter abbreviated as “organic EL”) display device has high visibility due to self-coloring, and, unlike a liquid crystal display device, is an all-solid-state display, has excellent impact resistance, and has a high response speed. Attention has been focused on advantages such as little influence from temperature changes and a large viewing angle.

The organic EL display device has an organic EL element based on a laminated structure in which an anode, an organic EL layer including a light emitting layer, and a cathode are laminated in this order. In addition, the organic EL display device can perform color display by the color of light from the light emitting layer of the organic EL element. In order to perform color display with better color development, the light emitting layer and the colored layer are provided. A combination with a color filter is also widely used.
In such an organic EL display device, since display is performed by driving an organic EL display element, it is required to perform display with high luminance with lower power consumption.

  Therefore, in recent years, an organic EL display device including a pixel unit having four sub-pixels in which a white sub-pixel is added to three sub-pixels of red, green, and blue has been proposed (for example, Patent Document 1). ). In the organic EL display device described above, as a color filter, a transparent base material, and a colored portion provided on the transparent base material in a pattern shape corresponding to the three-color sub-pixels and having a patterned colored layer; It has been proposed to use a pixel having a white portion having a transparent layer that is provided in a pattern corresponding to a white subpixel and transmits white light as it is.

  Incidentally, one of the anode and the cathode of the organic EL element in the organic EL display device is usually composed of a metal electrode. Therefore, in an organic EL display device, when used under sunlight, there is a problem that display defects such as a decrease in contrast occur due to sunlight reflected by the metal electrode of the organic EL element. is there.

For the above-described problem, for example, a technique for preventing sunlight reflection by providing a circularly polarizing plate on the observer side of the organic EL display device has been proposed.
However, when a circularly polarizing plate is used, the above-described display failure due to sunlight reflection can be suppressed, but transmission of white light emitted from the organic EL element of the organic EL display device is hindered by the circularly polarizing plate. There is a problem that only a luminance of 50% or less can be obtained as compared with the luminance when a polarizing plate is not used.

JP 2007-516564 A

  In view of the above situation, the present inventors conducted extensive research and found that the above-described display failure due to sunlight reflection is mainly caused by sunlight reflection in the white subpixel of the organic EL display device. . Therefore, the present inventors suppress the above-described display failure due to sunlight reflection in the organic EL display device by forming a light absorbing layer capable of absorbing sunlight on the white portion of the color filter. However, an attempt was made to realize display with good luminance. In addition, the inventors have made such an attempt to recognize the shade of reflected sunlight of sunlight whose intensity has been attenuated by transmitting through the light absorption layer. It was found that the color of the white display changes when used indoors and when used under sunlight. The present invention has been made based on the above findings.

  The present invention, when used in an organic EL display device, can display with good luminance while suppressing display defects due to sunlight reflection, and displays white when used indoors and under sunlight. Color filter for organic EL display device capable of reducing change in hue, organic EL display device using the same, method for designing color filter for organic EL display device for designing the same, and manufacturing the same An object of the present invention is to provide a method for manufacturing a color filter for an organic EL display device.

  In order to solve the above-described problems, the present invention provides a color filter for an organic EL display device that is used in an organic EL display device that includes an organic EL element including a light emitting layer and uses white light from the light emitting layer as a light emission source. And having a transparent base, a colored portion provided in a pattern on the transparent base and having a patterned colored layer, and a white portion provided in a pattern on the transparent base, The white portion on the transparent substrate is formed with a light absorption layer composed of a resin containing a colorant, and the average transmittance of the white portion is in the range of 50% to 98%, and CIE1931- In the xy chromaticity diagram of the XYZ color system, the transmission chromaticity of the white light transmitted through the white part is (x, y) = (x1, y1), and the reflected chromaticity of sunlight of the white part is ( When x, y) = (x2, y2), the amount of change in x (Δ = | X2-x1 |) and the amount of change in y (Δy = | y2-y1 |) to provide a color filter for an organic EL display device, characterized in that 0.025 or less.

  According to the present invention, since the light absorption layer is formed in the white portion, the white portion exhibits the above-described optical characteristics. Therefore, when the color filter of the present invention is used in an organic EL display device, It is possible to perform display with good luminance while suppressing the above-described display failure due to sunlight reflection. In addition, since the light absorption layer is formed in the white portion, the white portion exhibits the color characteristics described above, and therefore, when the organic EL display device is used indoors and under sunlight. In addition, the change in the hue of the white display can be reduced.

  In the invention, in the xy chromaticity diagram of the CIE1931-XYZ color system, the transmission chromaticity of the white light transmitted through the white part is (x, y) = (x1, y1), and the transmission of the colored part is performed. When the chromaticity of the white point due to chromaticity is (x, y) = (x3, y3), the amount of change in x (Δx ′ = | x3−x1 |) and the amount of change in y (Δy ′ = | y3 -Y1 |) is preferably 0.030 or less. Since the difference in hue between the white display in the colored portion and the white display in the white portion can also be reduced, color unevenness can be reduced and better display can be performed.

  In the above invention, in the xy chromaticity diagram of the CIE1931-XYZ color system, the reflected chromaticity of sunlight in the white portion is (x, y) = (x2, y2), and the reflected sunlight in the colored portion is reflected. When the chromaticity of the white point due to chromaticity is (x, y) = (x4, y4), the amount of change in x (Δx ″ = | x4-x2 |) and the amount of change in y (Δy ″ = | y4 -Y2 |) is preferably 0.040 or less. Since the difference in hue between the white display in the colored portion and the white display in the white portion can also be reduced, color unevenness can be reduced and better display can be performed under sunlight.

  The present invention includes a color filter for an organic EL display device, a counter substrate, an organic EL element formed between the color filter for the organic EL display device and the counter substrate, and including a light emitting layer. An organic EL display device using white light from a light emitting layer as a light emission source, wherein the color filter for organic EL display device is provided in a pattern on a transparent base material and the transparent base material. A light-absorbing layer composed of a resin containing a coloring material in the white portion on the transparent base material, and a white portion provided in a pattern on the transparent base material. The white light transmission chromaticity of the white light transmitted through the white part in the xy chromaticity diagram of the CIE1931-XYZ color system in which the average transmittance of the white part is in the range of 50% to 98%. (X, y) = (x1, y1) When the reflected chromaticity of sunlight in the white part is (x, y) = (x2, y2), the amount of change in x (Δx = | x2−x1 |) and the amount of change in y (Δy = | Y2-y1 |) is 0.025 or less, and an organic EL display device is provided.

  According to the present invention, by having the color filter for the organic EL display device, it is possible to perform display with good luminance while suppressing display defects due to sunlight reflection, and used indoors and under sunlight. In this case, an organic EL display device with little change in white display color can be obtained.

  The present invention is used in an organic EL display device having an organic EL element including a light emitting layer and using white light from the light emitting layer as a light emission source, and is provided in a pattern on the transparent substrate and the transparent substrate. A colored portion having a patterned colored layer and a white portion provided in a pattern on the transparent substrate, and the white portion on the transparent substrate is composed of a resin containing a coloring material. A method for designing a color filter for an organic EL display device in which a light absorbing layer is formed, wherein the average transmittance of the white portion is in the range of 50% to 98%, and the xy color of the CIE1931-XYZ color system In the degree diagram, the transmission chromaticity of the white light transmitted through the white part is (x, y) = (x1, y1), and the reflected chromaticity of sunlight in the white part is (x, y) = (x2). , Y2), the amount of change in x (Δx = | x2-x1 |) And a light absorption layer adjustment step of adjusting the light absorption layer so that a change amount of Δy (Δy = | y2−y1 |) is 0.025 or less. Color filter for organic EL display device Provide a design method.

  According to the present invention, by having the light absorption layer adjustment step, when used in an organic EL display device, it is possible to perform display with good luminance while suppressing the occurrence of display failure due to sunlight reflection. In addition, it is possible to design a color filter for an organic EL display device with little change in the hue of white display indoors and under sunlight.

  The present invention is used in an organic EL display device having an organic EL element including a light emitting layer and using white light from the light emitting layer as a light emission source, and is provided in a pattern on the transparent substrate and the transparent substrate. A colored portion having a patterned colored layer and a white portion provided in a pattern on the transparent substrate, and the white portion on the transparent substrate is composed of a resin containing a coloring material. A method for manufacturing a color filter for an organic EL display device in which a light absorption layer is formed, wherein the average transmittance of the white portion is in the range of 50% to 98%, and the xy color of the CIE1931-XYZ color system In the degree diagram, the transmission chromaticity of the white light transmitted through the white part is (x, y) = (x1, y1), and the reflected chromaticity of sunlight in the white part is (x, y) = (x2). , Y2), the amount of change in x (Δx = | x2-x1 |) And the light adjusted by the design step, the light absorption layer adjustment step for adjusting the light absorption layer so that the change amount of y and y (Δy = | y2−y1 |) is 0.025 or less. And a light absorption layer forming step of forming an absorption layer on the white portion on the transparent substrate. A method for producing a color filter for an organic EL display device is provided.

  According to the present invention, by using the above-described design process, when used in an organic EL display device, it is possible to perform display with good luminance while suppressing the occurrence of display defects due to sunlight reflection. It is possible to manufacture a color filter for an organic EL display device with little change in the hue of white display under sunlight.

  When used in an organic EL display device, the color filter for an organic EL display device of the present invention can perform display with good luminance while suppressing the occurrence of display defects due to sunlight reflection. When it is used under the above, there is an effect that it is possible to make the change in the hue of the white display small.

It is a schematic sectional drawing which shows an example of the color filter for organic EL display apparatuses of this invention. It is a schematic sectional drawing which shows the other example of the color filter for organic EL display apparatuses of this invention. It is a schematic sectional drawing which shows an example of the organic electroluminescent display apparatus of this invention. It is a schematic sectional drawing which shows the other example of the organic electroluminescent display apparatus of this invention. It is explanatory drawing explaining the display method of the organic EL display apparatus using the color filter for organic EL display apparatuses of this invention. It is process drawing which shows an example of the design method of the color filter for organic electroluminescent display apparatuses of this invention. It is process drawing which shows an example of the manufacturing method of the color filter of this invention. It is explanatory drawing explaining the light measured in an Example. It is explanatory drawing explaining the display method of the organic electroluminescence display using the color filter for conventional organic electroluminescence displays. It is explanatory drawing explaining the display method of the organic electroluminescence display using the color filter for conventional organic electroluminescence displays.

  The present invention relates to a color filter for an organic EL display device (hereinafter sometimes simply referred to as a color filter), an organic EL display device, a method for designing a color filter for an organic EL display device, and an organic EL display device. The present invention relates to a method for manufacturing a color filter.

Here, the white light in the present invention refers to white light emitted from the light emitting layer of the organic EL element. The white light may be white light emitted from a monochromatic white light emitting layer, and the light emitted from a plurality of color light emitting layers such as a red light emitting layer, a green light emitting layer, and a blue light emitting layer may be mixed. It may be white light constituted by.
The white light is a chromaticity in the xy chromaticity diagram of the CIE1931-XYZ color system (hereinafter sometimes simply referred to as chromaticity) (x, y) is 0.200 ≦ x ≦ 0. 400 and light with 0.200 ≦ y ≦ 0.400. The specific shade of white light can be appropriately determined depending on the type of material constituting the light emitting layer, its composition, and the like. In some cases, the C light source can be used as white light from the white light emitting layer.
The white light chromaticity measurement method can be the same as a general chromaticity measurement method. For example, it can be measured using a luminance meter SR-3 UL1 (manufactured by TOPCON).

Further, the chromaticity of sunlight in the present invention is the chromaticity of the D65 light source, and specifically, (x, y) = (0.313, 0.329).
Note that the method for measuring the chromaticity of sunlight can be the same as the method for measuring the chromaticity of white light, and a description thereof will be omitted here.

  Each invention will be described below.

A. Color filter for organic EL display device The color filter for organic EL display device of the present invention has an organic EL element including a light emitting layer, and is used for an organic EL display device using white light from the light emitting layer as a light emission source. A color filter for an EL display device, which is a transparent substrate, a colored portion provided in a pattern on the transparent substrate and having a patterned colored layer, and a white color provided in a pattern on the transparent substrate A light absorption layer composed of a resin containing a colorant is formed on the white part on the transparent substrate, and the average transmittance of the white part is 50% to 98%. In the xy chromaticity diagram of the CIE1931-XYZ color system, the transmission chromaticity of the white light transmitted through the white portion is (x, y) = (x1, y1), and the sun of the white portion Let the reflection chromaticity of light be (x, y) = ( x2, y2), the change amount of x (Δx = | x2-x1 |) and the change amount of y (Δy = | y2-y1 |) are 0.025 or less. is there.

  Here, the colored portion and the white portion in the present invention correspond to the colored subpixel and the white subpixel constituting the pixel portion of the organic EL display device when the color filter of the present invention is used in the organic EL display device. The part arrange | positioned so that it may do.

Further, in the present invention, the white light transmitted through the white portion (hereinafter sometimes referred to as transmitted light) means that the laminated portion of the transparent base material and the light absorption layer in the white portion is transferred from one surface to the other surface. White light transmitted once.
The reflected chromaticity of sunlight in the white part refers to the chromaticity of sunlight reflected on the white part in the xy chromaticity diagram of the CIE1931-XYZ color system.
Further, in the present invention, the sunlight reflected on the white part (hereinafter sometimes referred to as reflected light) is the laminated part of the transparent base material and the light absorption layer in the white part from one surface to the other surface. After transmission, it refers to sunlight reflected by a metal or the like and transmitted again from the other surface to the one surface of the stacked portion, that is, transmitted through the stacked portion twice.

  In the following description, light obtained by transmitting light from the light emitting layer through the colored portion may be referred to as colored transmitted light, and sunlight reflected from the colored portion may be referred to as colored reflected light. .

Here, the color filter of the present invention will be described with reference to the drawings. 1 and 2 are schematic sectional views showing an example of the color filter of the present invention.
As illustrated in FIGS. 1 and 2, the color filter 10 of the present invention includes a transparent substrate 1 and a patterned colored layer (in FIG. 1, a red colored layer) provided in a pattern on the transparent substrate 1. 2R, green colored layer 2G, and blue colored layer 2B) in a colored pattern 10C (in FIG. 1, red colored part 10R, green colored part 10G, and blue colored part 10B) and transparent substrate 1 in a pattern The light absorption layer 3 made of a resin containing a coloring material is formed on the white portion 10W on the transparent substrate 1.
1 shows an example in which the light absorption layer 3 is formed in a pattern on the white portion 10W on the transparent substrate 1, and in FIG. 2, the light absorption layer 3 includes a transparent base including the white portion 10W. An example in which the entire surface of the material 1 is formed is shown. In addition, as illustrated in FIG. 1, the color filter 10 of the present invention may include a light shielding portion 4 that partitions the colored portions 10R, 10G, and 10B and the white portion 10W. Further, as illustrated in FIG. 4 described later, a protective layer 5 may be formed on the colored layers 2R, 2G, 2B and the light absorption layer 3.
In addition, the color filter 10 of the present invention has an average white light transmittance of 50% to 98% in the white portion 10W, and transmits the white portion 10W in the xy chromaticity diagram of the CIE1931-XYZ color system. The transmitted chromaticity of the white light (hereinafter sometimes referred to as the chromaticity of the transmitted light in the white portion) is (x, y) = (x1, y1), and the reflection of sunlight in the white portion 10W. When the chromaticity (hereinafter sometimes referred to as the chromaticity of the reflected light of the white portion) is (x, y) = (x2, y2), the amount of change in x (Δx = | x2− x1 |) and the amount of change in y (Δy = | y2−y1 |) is 0.025 or less.

Moreover, the color filter of this invention has an organic EL element containing a light emitting layer, and is used for the organic EL display apparatus which uses the white light from a light emitting layer as a light emission source.
Such an organic EL display device will be described with reference to the drawings. FIG. 3 is a schematic cross-sectional view showing an example of an organic EL display device using the color filter of the present invention. FIG. 3 shows an example in which the organic EL display device is a top emission type organic EL display device. As illustrated in FIG. 3, such an organic EL display device 100 is formed on one surface of the color filter 10, the facing base material 20, and the facing base material 20, and the color filter 10 and the facing base. And an organic EL element 30 disposed between the materials 20. In addition, the organic EL element 30 is formed on the first electrode layer 31a formed on the counter substrate 20, the organic EL layer 32 including the light emitting layer, and the organic EL layer 32 formed on the first electrode layer 31a. The second electrode layer 31b is formed. In this case, a metal electrode is used for the first electrode layer 31a, and a transparent electrode is used for the second electrode layer 31b. In the present invention, the sealing material 40 is usually disposed between the color filter 10 and the counter substrate 20 and on the outer periphery of the color filter 10 and the counter substrate 20. The color filter 10 can be the same as the content described in FIG. 1, and thus the description thereof is omitted here.
Although not shown, when the organic EL display device is a top emission type organic EL display device, the organic EL element is arranged so that the side opposite to the light absorption layer side of the color filter faces the organic EL element. Also good.

FIG. 4 is a schematic sectional view showing another example of the organic EL display device using the color filter of the present invention. FIG. 4 shows an example in which the organic EL display device is a bottom emission type organic EL display device. In this case, the organic EL display device 100 is formed on the color filter 10, the counter substrate 20, and the protective layer 5 of the color filter 10, and the organic EL element disposed between the color filter 10 and the counter substrate 20. 30. The organic EL element 30 includes a first electrode layer 31a formed on the color filter 10, an organic EL layer 32 formed on the first electrode layer 31a, and a second electrode layer formed on the organic EL layer 32. 31b. In this case, a transparent electrode is used for the first electrode layer 31a, and a metal electrode is used for the second electrode 31b.
Note that the reference numerals not described in FIG. 4 can be the same as the reference numerals described in FIG. 1 and FIG.

  According to the present invention, since the light absorption layer is formed in the white portion, the white portion exhibits the above-described optical characteristics. Therefore, when the color filter of the present invention is used in an organic EL display device, It is possible to perform display with good luminance while suppressing the above-described display failure due to sunlight reflection. In addition, since the light absorption layer is formed in the white portion, the white portion exhibits the color characteristics described above, and therefore, when the organic EL display device is used indoors and under sunlight. In addition, the change in the hue of the white display can be reduced.

More specifically, according to the present invention, since the light absorption layer is formed in the white part, when the color filter of the present invention is used in the organic EL display device, Since a part of the incident sunlight can be absorbed by the light absorption layer, the intensity of the reflected light can be attenuated, and the occurrence of display defects due to the sunlight reflection can be suppressed. In addition, since the average transmittance of the white portion is within the above range, it is possible to suppress a decrease in luminance of white light emitted from the white subpixel of the organic EL display device even when the light absorption layer is provided. Become.
Further, according to the present invention, since Δx and Δy of the white portion are 0.025 or less, the difference in hue between transmitted light and reflected light observed in the white subpixel of the organic EL display device is reduced. be able to. Therefore, when the organic EL display device using the color filter of the present invention is used indoors and used under sunlight, the change in the hue of white display can be reduced.

  Here, the effect when the color filter of the present invention is used in an organic EL display device will be described in comparison with the case where a conventional color filter is used in an organic EL display device.

First, a case where a conventional color filter is used in an organic EL display device will be described.
9 and 10 are explanatory diagrams illustrating an example of a display method of an organic EL display device using a conventional color filter. In the following description, for ease of explanation, a case where the light from the light emitting layer of the organic EL element corresponding to each subpixel is white light will be described.
Conventionally, in the organic EL display device 100 ′ having the white subpixel illustrated in FIG. 9, display defects due to sunlight reflection have been cited as a problem. When completing the present invention, the present inventors first found that the above display failure is mainly caused by sunlight reflection in the white subpixel of the organic EL display device 100 ′.
That is, when the organic EL display device 100 ′ is used under sunlight, as illustrated in FIG. 9A, the sunlight Ls is emitted from the red colored portion 10R of the color filter 10 ′ disposed on the viewer side. The green colored portion 10G and the blue colored portion 10B and other colored portions 10C and the white portion 10W are transmitted and enter the organic EL display device 100 ′. Further, the sunlight Ls is reflected by the first electrode layer 31a (metal electrode) of the organic EL element 30, and is again transmitted through the colored portion 10C and the white portion 10W of the color filter 10 ′, and the organic EL display device 100. Are emitted as colored reflected light such as red reflected light Lr (R), green reflected light Lr (G), and blue reflected light Lr (B), and reflected light Lr ′.
On the other hand, as illustrated in FIG. 9B, the white light Lw passes through the above-described colored portion 10C and the white portion 10W of the color filter 10 ′ disposed on the viewer side and passes through the organic EL display device 100 ′. The light is emitted to the outside as red transmitted light Lt (R), green transmitted light Lt (G), blue transmitted light Lt (B), and transmitted light Lt ′.
Here, as illustrated in FIG. 9, in the conventional organic EL display device 100 ′, as the color filter 10 ′, a patterned colored layer (in FIG. 9, the red colored layer 2R, the green colored layer 2B, and the blue colored layer). What has the coloring part 10C which has the layer 2B), and the white part 10W which has the transparent layer 6 which permeate | transmits the white light Lw as it is is used. The transparent layer 6 described above generally has a property of allowing sunlight Ls to pass through as it is. Therefore, in the white subpixel of the organic EL display device 100 ′, the sunlight Ls incident on the inside of the organic EL display device 100 ′ is emitted as reflected light Lr ′ while maintaining the same intensity. On the other hand, in the colored subpixel of the organic EL display device 100 ′, the sunlight Ls incident on the organic EL display device is colored after a part of light is absorbed by the colored layer in the process of passing through the colored layer twice. Since it is emitted as reflected light, it becomes light with a very small intensity compared with the reflected light Lr ′ in the white sub-pixel described above.
Therefore, when the organic EL display device 100 ′ is used under sunlight, the white light sub-pixel emits the transmitted light Lt ′ and the strong reflected light Lr ′, whereas the colored sub-pixel emits light. Since the colored transmitted light and the colored reflected light having a very small intensity with respect to the reflected light Lr ′ are emitted, the luminance in the white sub-pixel is relatively high due to the difference in intensity between the reflected light and the colored reflected light. Since the luminance of other colored sub-pixels is relatively low, problems such as a decrease in contrast occur.

  Further, with respect to the above problem, as illustrated in FIG. 10, it has been proposed to arrange the circularly polarizing plate 50 on the observer side of the organic EL display device 100 ″. The polarizing film is formed by laminating a polarizing film and a retardation film, and the retardation film is controlled so that the retardation becomes 1/4 of the wavelength of light. 10 is used, the sunlight Ls incident on the color filter 10 ′ is first linearly polarized by the polarizing film and then circularly polarized by the retardation film, as illustrated in FIG. The circularly polarized state is reversed when reflected by the first electrode layer 31a of the organic EL element 30. After that, when the reflected light passes through the retardation film again, the light is reflected by the color filter 10 ′. Therefore, the linearly polarized light is absorbed when it reaches the polarizing film again by providing the circularly polarizing plate 50 having the above-described characteristics. The sunlight Ls that has entered the organic EL display device 100 ″ can be hardly emitted to the outside as reflected light or colored reflected light. However, when the circularly polarizing plate 50 is provided, as illustrated in FIG. 10B, the intensity of the white light Lw emitted from the light emitting layer 32 of the organic EL element 30 is also 1 before and after passing through the circularly polarizing plate 50. / 2, the intensity of the red transmitted light Lt (R) ″, the green transmitted light Lt (G) ″, the blue transmitted light Lt (B) ″, and the transmitted light Lt ″ is greatly attenuated, There arises a problem that the luminance of the EL display device is lowered.

On the other hand, the color filter of the present invention can eliminate the above-described problems when the circularly polarizing plate is not used and the problems when the circularly polarizing plate is used by using the light absorption layer as follows. it can.
FIG. 5 is an explanatory view showing an example of the display method of the organic EL display device using the color filter of the present invention.
First, the effect | action with respect to reflected light Lr is demonstrated using Fig.5 (a). Here, in this invention, since the light absorption layer 3 is comprised from resin containing a coloring material, it has a function which absorbs light. Therefore, in the organic EL display device 100 using the color filter 10 of the present invention, in the white portion 10W, the sunlight Ls passes through the laminated portion of the light absorption layer 3 and the transparent substrate 1 twice in the process. Since part of the light is absorbed, the reflected light Lr is attenuated compared to the original sunlight Ls, and becomes light with low intensity. Therefore, since the intensity of the reflected light Lr observed in the white subpixel of the organic EL display device can be reduced, the above-described display failure due to sunlight reflection can be suppressed. Note that the behavior of the colored reflected light in the colored portion 10C of the organic EL display device 100 is the same as that described with reference to FIG.

Next, the effect | action with respect to transmitted light is demonstrated using FIG.5 (b). In the present invention, since the white portion 10W includes the light absorption layer 3, a part of the white light Lw is absorbed, but the average transmittance of the white portion 10W is within the above-described range. The attenuation of the intensity of the white light Lw due to transmission through the light absorption layer 3 can be made small. More specifically, as illustrated in FIG. 10B, the attenuation of the intensity of the white light Lw can be reduced as compared with the case where the circularly polarizing plate 50 is disposed on the viewer side.
In addition, by using the light absorption layer 3 described above, it is not necessary to arrange a circularly polarizing plate in the colored subpixel of the organic EL display device. Therefore, the red transmitted light Lt (R) and the green transmitted light Lt (G ) And the blue transmitted light Lt (B) can have good luminance, and the whole organic EL display device 100 can have good luminance.

  Note that reference numerals that are not described in FIGS. 5, 9, and 10 can be the same as those described in FIGS.

Furthermore, the color filter of this invention has the following effects by having a light absorption layer.
In the organic EL display device using the color filter of the present invention, the display is performed mainly using only white light indoors. Therefore, the color of white display in the white sub-pixel is appropriately determined according to the color of transmitted light. Is done. On the other hand, since reflected light is observed in addition to transmitted light under sunlight, the color of white display in the white subpixel is determined by the color of transmitted light and the color of reflected light. For this reason, when the difference in color between the transmitted light and the reflected light is large, the color of the white display indoors and the color of the white display under sunlight are observed differently. Therefore, the display of the organic EL display device There is concern that the characteristics will change. In this regard, in the present invention, since the above-described Δx and Δy can be 0.025 or less by having the light absorption layer in the white portion, the above-described white display shade due to the difference in the external environment is equivalent. Can be used.

The reason why the above-described Δx and Δy can be 0.025 or less when the color filter of the present invention has the light absorption layer in the white part is considered as follows.
Here, the difference between the shade of transmitted light and the shade of reflected light is due to the difference in shade of white light and sunlight. Further, the difference in hue between the white light and sunlight is caused by the difference in the waveform of the spectrum of white light and the spectrum of sunlight in the visible light wavelength region.
In the white portion of the color filter in the organic EL display device, white light passes through the light absorption layer once and is emitted as transmitted light, whereas sunlight passes through the light absorption layer twice and is reflected as light. Emitted. Therefore, when the light transmittance of the specific wavelength region of the light absorption layer is α%, the light of the specific wavelength region included in the white light is transmitted once through the light absorption layer. While the light of the specific wavelength range described above is included at an intensity of α%, the light of the specific wavelength range included in sunlight passes through the light absorption layer twice, so in the reflected light Is included at an intensity of α ² % in the specific wavelength range described above, and therefore the degree of attenuation of the intensity is greater than that of the light in the specific wavelength range included in white light.
In the present invention, by utilizing the difference in behavior of sunlight and white light in the organic EL display device, when comparing the waveform of the spectrum of white light and the waveform of the spectrum in the visible light wavelength range of sunlight, By adding a colorant that absorbs light in the wavelength range in which the waveform peak in light is larger than that in white light to the light absorption layer, the light in the specific wavelength range contained in sunlight is further attenuated. Therefore, it is possible to reduce the difference in the intensity of the light in the above-mentioned wavelength range included in the transmitted light and the reflected light. Therefore, since the difference in color can be reduced by reducing the difference in intensity of light in a specific wavelength range, Δx and Δy of transmitted light and reflected light can be reduced.

Moreover, the color filter of this invention can also suppress the reflection nonuniformity in the said organic EL display apparatus by forming the light absorption layer in the white part. The reason for this is considered as follows.
Here, the reflection unevenness is caused by external light incident on one subpixel from an oblique direction with respect to the display surface in the organic EL display device, reflected on the metal electrode of the organic EL element, and from other subpixels of different colors. By being emitted as reflected light, it is a problem that occurs because two colors of light are mixed and observed by a viewer in a part of the other sub-pixels. Such reflection unevenness is particularly easily observed when external light incident from the colored subpixel is emitted as reflected light from the white subpixel.
On the other hand, when the light absorption layer is formed in the white part as in the present invention, it is possible to attenuate the reflected light that causes the above-described reflection unevenness. Unevenness can be suppressed.

  In the above description, for ease of explanation, the case where the influence of the average transmittance and chromaticity of the transparent substrate is not taken into account has been described. However, the light characteristics and color characteristics of the transparent substrate are organic EL display. When the above-described problems in the apparatus are affected, it is possible to adjust the light characteristics and the color characteristics of the white portion using the light absorption layer in consideration of these problems.

As described above, in the color filter of the present invention, since the light absorption layer is formed in the white part on the base material, the white part can exhibit predetermined light characteristics and color characteristics. In other words, according to the organic EL display device in which the color filter of the present invention is used, the white portion of the color filter can be adjusted using the light absorption layer so as to exhibit predetermined light characteristics and color characteristics. .
Details of the color filter of the present invention will be described below.

1. Characteristics of White Part The color filter of the present invention is characterized in that the white part exhibits predetermined light characteristics and color characteristics by forming a light absorption layer described later in the white part. In other words, the light absorption layer is adjusted so that the white portion has predetermined light characteristics and color characteristics. More specifically, adjustment of the light characteristics and color characteristics in the white portion, the composition and thickness of the light absorbing layer such as the type of colorant contained in the resin constituting the light absorbing layer, and the content of the colorant It is characterized by being performed by adjusting.
Hereafter, each characteristic of the white part used as the adjustment conditions of a composition and thickness of a light absorption layer is demonstrated.

(1) Light Characteristics The light characteristics in the white part will be described.
In the white part, since a light absorption layer composed of a resin containing a colorant is formed, the reflectance of sunlight in the white part can be reduced as compared with the case of having a conventional transparent layer. It is possible to attenuate the intensity of the reflected light. However, when the purpose is only to attenuate the intensity of the reflected light, the average transmittance of the white portion is also reduced, so that the intensity of the transmitted light becomes weak and it becomes difficult to display with good luminance. Is concerned.

Therefore, the present invention is characterized in that the average transmittance of the white portion is in the range of 50% to 98%. In the present invention, by setting the average transmittance to be equal to or higher than the above lower limit value, when the color filter of the present invention is used in an organic EL display device, it is possible to perform display with good luminance. More specifically, display with higher luminance can be performed as compared with an organic EL display device using a circularly polarizing plate.
Moreover, if average transmittance is below the said upper limit, the intensity | strength of reflected light can be attenuated to such an extent that the display defect by sunlight reflection can be suppressed.
The average transmittance may be 50% or more, and more preferably 60% or more. The average transmittance may be 98% or less, more preferably 90% or less, and still more preferably 80% or less.
This is because, by setting the average transmittance as described above, it is possible to more suitably suppress display defects due to sunlight reflection.
The average transmittance of the white part is a value obtained by averaging the transmission spectrum of the white part over the entire visible light range (380 nm to 780 nm). Moreover, the average transmittance of the white part can be obtained by a general measurement method, and can be obtained, for example, by measuring using a microspectroscope OSP-SP2000 (manufactured by OLYMPUS).

  In the present invention, the waveform of the transmitted light spectrum of white light and the waveform of the reflected light spectrum are adjusted so that Δx and Δy of the white portion are 0.025 or less.

(2) Color Characteristics Next, the color characteristics of the white part will be described.
In the present invention, in the xy chromaticity diagram of the CIE1931-XYZ color system, the transmission chromaticity of the white light transmitted through the white portion is (x, y) = (x1, y1), and the sun of the white portion When the reflected chromaticity of light is (x, y) = (x2, y2), the change amount of x (Δx = | x2-x1 |) and the change amount of y (Δy = | y2-y1 |) are It is 0.025 or less.

  Here, Δx and Δy are not particularly limited as long as they are each 0.025 or less. Here, the reason for setting Δx and Δy to be 0.025 or less is that, by setting the above Δx and Δy to the above values, the color unevenness of the transmitted light and reflected light of the white part can be reduced, and the sunlight This is because the visibility of the display below can be ensured.

In the xy chromaticity diagram of the CIE1931-XYZ color system, white light transmission chromaticity (x, y) = (x1, y1) and solar light reflection chromaticity (x, y) = (x2) , Y2) is appropriately selected according to the use of the organic EL display device in which the color filter of the present invention is used.
About the measuring method of x1 and y1 mentioned above, and x2 and y2, the transmission spectrum and reflection spectrum of a white part are measured, for example using microspectroscope OSP-SP2000 (made by OLYMPUS), and a transmission spectrum is C light source, for example Such white light and reflection spectrum can be obtained by converting to a D65 light source and calculating each chromaticity coordinate.

Further, in the present invention, when the colored portion has a red portion, a green portion, and a blue portion, the transmission chromaticity of the white light transmitted through the white portion in the xy chromaticity diagram of the CIE1931-XYZ color system Is (x, y) = (x1, y1), and the chromaticity of the white point by the transmission chromaticity of the colored portion is (x, y) = (x3, y3), the amount of change in x (Δx It is preferable that '= | x3-x1 |) and the amount of change in y (Δy' = | y3-y1 |) are 0.030 or less. In addition to the above-described Δx and Δy being 0.025 or less, Δx ′ and Δy ′ are 0.030 or less, so that white light configured by mixing colored transmitted light of each color (mixed color transmission) Light) and the difference in hue between white light transmitted through the white portion can be reduced. Therefore, since the difference in hue between the white display in the colored portion and the white display in the white portion can be reduced, color unevenness can be reduced and better display can be performed.
Here, the chromaticity of the white point based on the transmitted chromaticity of the colored portion is obtained from the chromaticities of the red transmitted light, the green transmitted light, and the blue transmitted light, and is a white color configured by mixing the colored transmitted light of each color. Represents the chromaticity of light.

In the present invention, when the colored portion has the above-described three colored portions, the reflected chromaticity of sunlight in the white portion in the xy chromaticity diagram of the CIE1931-XYZ color system is expressed as (x, y). = (X2, y2), and when the chromaticity of the white point by the reflected chromaticity of sunlight of the colored portion is (x, y) = (x4, y4), the amount of change in x (Δx ″ = | x4-x2 |) and the amount of change in y (Δy ″ = | y4-y2 |) are preferably 0.040 or less. In addition to the above Δx and Δy being 0.025 or less, Δx ″ and Δy ″ are 0.040 or less, so that white light (mixed color reflection) configured by mixing colored reflected light of each color is mixed. Light) and the color difference between the reflected light of the white portion can be reduced. Therefore, since the difference in hue between the white display in the colored portion and the white display in the white portion can be reduced, color unevenness can be reduced and better display can be performed under sunlight. .
The white point by the reflected chromaticity of sunlight of the colored part is obtained from the chromaticity of the red reflected light, the green reflected light, and the blue reflected light obtained by the sunlight reflecting each colored part. It represents the chromaticity of white light formed by mixing colored reflected light.

In the present invention, it is particularly preferable that all of the above-described Δx and Δy, Δx ′ and Δy ′, and Δx ″ and Δy ″ satisfy the above-described relationship. The difference in color between the white display in the white part and the white display in the colored part can be further reduced, and the difference in color between the white display indoors and under sunlight can be further reduced, reducing color unevenness. Thus, the visibility of the organic EL display device under sunlight can be more suitably ensured. Therefore, an organic EL display device capable of performing better display can be obtained.
In the present invention, the transmittance of the white part is higher than the transmittance of the colored part, and the hue of the transmitted light and reflected light of the white part greatly affects the visibility of the display. The smallest is preferred.

2. Next, the characteristics of the colored portion in the present invention will be described.
As the chromaticity (x, y) = (x3, y3) of the white point due to the transmission chromaticity of the colored portion in the xy chromaticity diagram of the CIE1931-XYZ color system, an organic EL display device using the color filter of the present invention In the above, there is no particular limitation as long as a desired white display can be performed, and it is appropriately selected according to the use of the organic EL display device.
The method for measuring the chromaticity of the white point based on the transmission chromaticity of the colored portion may be the same as the method of measuring the white light transmission chromaticity of the white portion and the sunlight reflection chromaticity of the white portion described above. Since it is possible, description here is abbreviate | omitted.

In addition, the color filter of the present invention is used as the chromaticity (x, y) = (x4, y4) of the white point due to the reflected chromaticity of sunlight in the colored portion in the xy chromaticity diagram of the CIE1931-XYZ color system. The organic EL display device is not particularly limited as long as white display can be performed, and is appropriately selected according to the use of the organic EL display device.
The method for measuring the chromaticity of the white point by the reflected chromaticity of sunlight of the colored portion is the same as the measuring method of the transmitted chromaticity of white light of the white portion and the reflected chromaticity of sunlight of the white portion described above. The explanation here is omitted.

3. Next, the configuration of the color filter of the present invention will be described. The color filter of this invention has a transparent base material, a colored layer, and a light absorption layer at least. Details of each component will be described below.

(1) Light absorption layer The light absorption layer in this invention is demonstrated.
The light absorption layer in the present invention is provided for imparting the above-described light characteristics and color characteristics to the white portion of the color filter.

  The light absorbing layer only needs to be formed on one surface of the transparent substrate, may be formed on the same surface as the colored layer described later, and is on the surface opposite to the colored layer side. Usually, it is formed on the same surface as the colored layer.

The formation position of the light absorption layer on the transparent substrate is not particularly limited as long as it is formed at least in the white part. For example, the light absorption layer 3 may be formed in a pattern on the white portion 10W on the transparent substrate 1 as illustrated in FIG. 1, and the entire transparent substrate 1 including the white portion 10W as illustrated in FIG. The light absorption layer 3 may be formed thereon. In the present invention, when the light absorption layer 3 is formed in a pattern on the white portion 10W on the transparent substrate 1 as illustrated in FIG. 1, the light characteristics and color characteristics of the light absorption layer 3 are in the colored portion 10C. Since it does not influence, the characteristic of the white part 10W can be made more optimal. On the other hand, when the light absorption layer 3 is formed on the entire surface of the transparent substrate 1 including the white portion 10W as illustrated in FIG. 2, the intensity of the reflected light that causes the above-described reflection unevenness is further attenuated. Therefore, the uneven reflection can be more suitably suppressed.
In the present invention, from the viewpoint of imparting desired light characteristics and color characteristics to the white portion, the light absorption layer is preferably formed in a pattern on the white portion on the substrate.

  When the light absorption layer is formed in a pattern, the pattern shape of the light absorption layer is appropriately determined according to the pattern shape of the white portion. The pattern shape of the white part is appropriately determined depending on the pattern arrangement of the pixel part used in the organic EL display device. The pattern arrangement of the pixel portion can be the same as that used in a general organic EL display device, and specifically includes a stripe arrangement, a mosaic arrangement, a dot arrangement, a pen tile arrangement, and the like. .

The thickness of the light absorption layer is appropriately selected according to the composition of the material of the light absorption layer and is not particularly limited. In this invention, it is preferable to form so that it may have thickness equivalent to the colored layer mentioned later. It is because it becomes easy to form another structure on the colored layer and the light absorption layer of the color filter.
Specifically, it is preferably in the range of 0.1 μm to 10.0 μm, in particular, in the range of 0.5 μm to 7.0 μm, particularly in the range of 1.0 μm to 5.0 μm.

A light absorption layer is comprised from resin containing a coloring material.
The resin is not particularly limited as long as it can form a light-absorbing layer capable of dispersing a colorant and imparting desired light characteristics and color characteristics to the white portion. The photosensitive resin which has the property can be used suitably.

The type of the photosensitive resin having translucency is not particularly limited, and any of a negative photosensitive resin and a positive photosensitive resin can be used.
The negative photosensitive resin used is not particularly limited, and a commonly used negative photosensitive resin can be used. For example, a chemically amplified photosensitive resin based on a crosslinked resin, specifically, a chemically amplified photosensitive resin in which a crosslinking agent is added to polyvinylphenol and an acid generator is further added. In addition, as an acrylic negative photosensitive resin, a photopolymerization initiator that generates a radical component upon irradiation with ultraviolet rays, a component that has an acrylic group in the molecule, causes a polymerization reaction by the generated radical, and cures thereafter, What contains the functional group (for example, the component which has an acidic group in the case of image development by an alkaline solution) which can melt | dissolve an unexposed part by image development can be used. Among the above-mentioned components having an acrylic group, examples of relatively low molecular weight polyfunctional acrylic molecules include dipentaerythritol hexaacrylate (DPHA), dipentaerythritol pentaacrylate (DPPA), and tetramethylpentatriacrylate (TMPTA). Can be mentioned. Examples of the high molecular weight polyfunctional acrylic molecule include a polymer in which an acrylic group is introduced via an epoxy group into a part of the carboxylic acid group of the styrene-acrylic acid-benzyl methacrylate copolymer, and methyl methacrylate-styrene- An acrylic acid copolymer etc. are mentioned.
Moreover, the positive photosensitive resin used is not particularly limited, and a commonly used positive photosensitive resin can be used. Specifically, a chemically amplified photosensitive resin using a novolac resin as a base resin can be used.

Next, the coloring material will be described.
In the present invention, the average transmittance and Δx and Δy of the light absorbing layer are adjusted by adding a colorant to the light absorbing layer.
In the present invention, the average transmittance and Δx and Δy of the light absorbing layer described above may be adjusted using one colorant, and the average transmittance and Δx and Δy described above may be adjusted using two or more colorants. May be adjusted.
In the present invention, it is more preferable to further adjust the above-described Δx and Δy, Δx ′ and Δy ′, and Δx ″ and Δy ″ by adding a colorant to the light absorption layer.
Examples of the colorant used in such a light absorption layer include a black colorant, a blue colorant, a purple colorant, a red colorant, and a green colorant.

Examples of the black colorant include carbon black and titanium black.
Moreover, as said blue coloring material, it is preferable that it is a blue phthalocyanine, for example. Examples of the blue phthalocyanine include C.I. I. Pigment Blue (hereinafter sometimes referred to as PB) 15: 1, PB15: 2, PB15: 3, PB15: 4, PB15: 6. In the present invention, two kinds of blue phthalocyanines may be used as the blue coloring material.
Examples of the purple colorant include C.I. I. CI pigment violet (hereinafter sometimes referred to as PV) 19, PV23, PV29, PV32 and the like.
Examples of the red coloring material include C.I. I. Pigment red (hereinafter sometimes referred to as PR) PR122, PR209, and the like.
Examples of the green colorant include C.I. I. Pigment green (hereinafter sometimes referred to as PG) 7, PG36, PG58, and the like.

  In the present invention, when a black colorant is used as the colorant, the light of all wavelengths in the visible light wavelength range of sunlight can be absorbed, so that the intensity of reflected light can be attenuated satisfactorily. In addition, the average transmittance of the light absorption layer can be adjusted favorably.

  The content of the colorant is appropriately selected according to the spectrum of transmitted light and reflected light of the light absorption layer, reflected light, average transmittance, thickness, and the like. In the range of 0.1 to 10.0 parts by mass, in particular in the range of 0.5 to 7.0 parts by mass, particularly 1.0 to 5.0 parts by mass with respect to 100 parts by mass. It is preferably within the range of parts. This is because when the content of the coloring material is less than the above range or exceeds the above range, it may be difficult to adjust the light characteristics and color characteristics of the white portion using the light absorption layer. In addition, content of a coloring material means the total content, when two or more coloring materials are added.

Here, as described above, in the present invention, the light characteristics and color characteristics of the white portion are adjusted by the composition and thickness of the light absorption layer.
The method for adjusting the composition and thickness of the light absorption layer is not particularly limited as long as the composition and thickness of the light absorption layer can be adjusted so that the light characteristics and color characteristics of the white portion are within the above-described ranges. For example, the method described in the section “C. Design Method of Color Filter for Organic EL Display Device” described later can be suitably used.

  The method for forming the light absorbing layer is not particularly limited as long as the light absorbing layer can be formed at least on the white portion on the base material, and a known method can be used as a general method for forming the resin layer. Explanation here is omitted.

(2) Colored layer The colored layer in this invention is formed in the pattern form in the colored part on a transparent base material.
The pattern shape of the colored layer is appropriately determined according to the pattern shape of the colored portion. Further, the pattern shape of the colored portion is appropriately determined depending on the pattern arrangement of the pixel portion used in the organic EL display device. Since the pattern arrangement of the pixel portion has been described in the section “(1) Light Absorbing Layer”, description thereof is omitted here.

  The colored layer is a layer that selectively transmits only light in a specific wavelength range. In the present invention, usually, a red colored layer that selectively transmits light in the red wavelength range, a green colored layer that selectively transmits light in the green wavelength range, and a blue wavelength range as the colored layer. A blue colored layer that selectively transmits light. In addition, the colored layers of a plurality of colors are not limited to the above-described red colored layer, green colored layer, and blue colored layer, and other colored layers such as a yellow colored layer may be included.

The colored layer is formed by dispersing or dissolving a colorant such as a pigment or dye of each color in a photosensitive resin.
The photosensitive resin can be the same as that described in the above-mentioned section “(1) Light absorption layer”, and thus description thereof is omitted here.

Among these, examples of the colorant used in the red colored layer include perylene pigments, lake pigments, azo pigments, quinacridone pigments, anthraquinone pigments, anthracene pigments, and isoindoline pigments. These pigments may be used alone or in combination of two or more.
Examples of the colorant used in the green colored layer include phthalocyanine pigments such as halogen polysubstituted phthalocyanine pigments or halogen polysubstituted copper phthalocyanine pigments, triphenylmethane basic dyes, isoindoline pigments, and isoindolinone pigments. And pigments. These pigments or dyes may be used alone or in combination of two or more.
Examples of the colorant used in the blue colored layer include copper phthalocyanine pigments, anthraquinone pigments, indanthrene pigments, indophenol pigments, cyanine pigments, dioxazine pigments and the like. These pigments may be used alone or in combination of two or more.

  The content of the colorant is not particularly limited as long as a desired color display can be performed.

  About the thickness of the said colored layer, it can select suitably according to the use of a color filter. Specifically, since it can be made equal to the thickness of the light absorption layer described above, description thereof is omitted here.

(3) Transparent base material The transparent base material in this invention supports the colored layer mentioned above and a light transmissive layer.

  The transparency of the transparent substrate is not particularly limited as long as the color filter of the present invention is used in an organic EL display device so long as light can be transmitted through the organic EL layer. However, the transmittance in the visible light region is preferably 80% or more, and more preferably 90% or more. Here, the transmittance | permeability of a transparent base material can be measured by JISK7361-1 (the test method of the total light transmittance of a plastic-transparent material).

  Examples of the transparent substrate include inflexible rigid materials such as quartz glass, Pyrex (registered trademark) glass, and synthetic quartz plates, or flexible materials such as resin films and optical resin plates. Can be used. Moreover, you may use what formed the barrier layer in the resin film.

  About the thickness of a transparent base material, it can determine suitably according to the use etc. of the color filter of this invention, and the material which comprises a transparent base material.

(4) Other Configurations The color filter of the present invention is not particularly limited as long as it has the above-described transparent substrate, colored layer, and light absorption layer, and other necessary configurations are appropriately selected and added. Can do. Examples of such a configuration include a light shielding portion, a protective layer, a TFT, and an electrode.

(A) Light-shielding part First, the light-shielding part in this invention is demonstrated.
The light shielding part in the present invention is formed in a pattern on a transparent substrate.
Moreover, the said light-shielding part demarcates each coloring part and white part.

  The pattern arrangement of the openings of the light shielding part is appropriately selected depending on the pattern arrangement of the pixel part of the organic EL display device.

Examples of the light shielding part include those composed of a metal material such as chromium, those obtained by dispersing a light shielding material in a resin layer, and those obtained by laminating a plurality of layers made of the same material as the colored layer. Can do.
About the material used for these light-shielding parts, thickness, its formation method, etc., since a well-known thing can be used, description here is abbreviate | omitted.

(B) Protective layer Next, the protective layer in this invention is demonstrated. In the color filter, the protective layer in the present invention is formed so as to cover the colored layer and the light absorbing layer. The color filter of the present invention is particularly preferably used when used in a bottom emission type organic EL display device.

  Moreover, the said protective layer will not be specifically limited if a color characteristic is not impaired, A general transparent resin can be used. In particular, the photocurable protective film is preferable because it can be patterned for each chip (colored portion and white portion).

  About the thickness of a protective layer, and a manufacturing method, since it can be made to be the same as that of what is used for a general color filter, description here is abbreviate | omitted.

(C) TFT
Next, the TFT will be described. When the color filter of the present invention is used in a bottom emission type organic EL display device, a TFT may be formed on a transparent substrate. Since the TFT can be the same as that used in a general organic EL display device, description thereof is omitted here.

(D) Electrode Next, the electrode will be described.
In the present invention, a metal electrode composed of Cu, Ag, Cr, Au, Ta, Mo, Pt, MAM, APC, or the like may be provided on the color filter. Further, a transparent electrode made of ITO, IZO, or the like may be provided.
The metal electrode can be preferably provided in a region (non-display region) that is not used for display in the color filter on the light shielding portion or the like.
By providing an electrode on the color filter of the present invention, when used in an organic EL display device, a reduction in luminance due to an applied voltage effect to the organic EL element can be reduced, and the power consumption of the organic EL display device can be reduced. Can be achieved.

4). Method for Producing Color Filter The method for producing the color filter of the present invention is not particularly limited and may be the same as that described in, for example, “D. Method for producing color filter for organic EL display device” described later. Since it is possible, description here is abbreviate | omitted.

5. Use The color filter of this invention has an organic EL element containing a light emitting layer, and is used for the organic EL display apparatus which uses the white light from a light emitting layer as a light emission source. Further, among the organic EL display devices described above, the organic EL display device can be suitably used for an organic EL display device used for a portable device.

B. Organic EL Display Device The organic EL display device of the present invention is formed between a color filter for an organic EL display device, a counter substrate, the color filter for organic EL display device, and the counter substrate, and includes a light emitting layer. An organic EL display device having an organic EL element and using white light from the light emitting layer as a light source, wherein the color filter for the organic EL display device is patterned on the transparent substrate and the transparent substrate. A colored portion having a patterned colored layer and a white portion provided in a pattern on the transparent substrate, and the white portion on the transparent substrate contains a coloring material. A light absorption layer made of a resin is formed, the average transmittance of the white portion is in the range of 50% to 98%, and the white portion in the xy chromaticity diagram of the CIE1931-XYZ color system is Transmission of the transmitted white light When the excess chromaticity is (x, y) = (x1, y1) and the reflected chromaticity of sunlight in the white part is (x, y) = (x2, y2), the amount of change in x (Δx = | X2-x1 |) and the amount of change in y (Δy = | y2-y1 |) is 0.025 or less.

  As a schematic cross-sectional view showing an example of the organic EL display device of the present invention, the above-described FIG. 3 and FIG. 4 can be mentioned. Since FIG. 3 and FIG. 4 have been described in the above-mentioned item “A. Color filter for organic EL display device”, description thereof is omitted here.

  According to this invention, it can be set as the organic EL display device which can display with favorable brightness | luminance, suppressing the display defect by sunlight reflection by having the said color filter for organic EL display devices. In addition, when used indoors or under sunlight, an organic EL display device with little change in the hue of white display can be obtained.

  Hereinafter, the details of the organic EL display device of the present invention will be described.

1. Color filter for organic EL display device The color filter for organic EL display device in the present invention can be the same as that described in the above-mentioned section "A. Color filter for organic EL display device". Description of is omitted.

2. Next, the counter substrate in the present invention will be described.
When the organic EL display device of the present invention is a top emission type organic EL display device, an organic EL element to be described later is formed on the counter substrate in the present invention.

  Since the organic EL display device of the present invention uses the color filter side as the light emitting surface, the opposing substrate may be transparent or may not be transparent.

  Examples of the opposing substrate include inflexible rigid materials such as quartz glass, Pyrex (registered trademark) glass, and synthetic quartz plates, or flexible materials such as resin films and optical resin plates. Can be used. Moreover, you may use what formed the barrier layer in the resin film.

When the organic EL display device of the present invention is a top emission type organic EL display device, a TFT may be formed on the counter substrate.
As the TFT, those generally used in organic EL display devices can be used.

3. Organic EL Element The organic EL element used in the present invention includes a first transparent electrode layer formed on either a color filter or a counter substrate, a first transparent electrode layer, and a light emitting layer. It can have an organic EL layer and a second electrode layer formed on the organic EL layer. Hereinafter, each configuration of the organic EL element will be described.

(1) Organic EL layer The organic EL layer has one or more organic layers including at least a light emitting layer.
As the light emitting layer, at least a light emitting layer corresponding to the white pixel portion emits white light is used. Specifically, it may be a white light-emitting layer that emits white light, or may be a light-emitting layer that is composed of a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer that emit three primary colors, respectively, and that emits white light.
In addition, the light emitting layer corresponding to the colored subpixel may emit white light as described above, or may be a light emitting layer that emits light of a color corresponding to the color of each colored subpixel.
Examples of the layer constituting the organic EL layer include a hole injection layer, a hole transport layer, an electron injection layer, and an electron transport layer in addition to the light emitting layer.
The organic EL layer can be the same as a general organic EL layer used in an organic EL element, and thus description thereof is omitted here.

(2) 1st electrode layer and 2nd electrode layer As a 1st electrode layer and a 2nd electrode layer, what is generally used for an organic EL element can be used. In the present invention, a transparent electrode is used for the first electrode layer and the second electrode layer formed on the color filter side, and a reflection such as a metal electrode is used for the one formed on the counter substrate side. The electrode which has property is used.
Further, the first electrode layer and the second electrode layer may be formed uniformly on the color filter or on the counter substrate, respectively, or may be formed in a pattern, and the organic EL display device of the present invention. It is appropriately selected according to the application and driving method.

4). Other Configurations The organic EL display device of the present invention is not particularly limited as long as it has the above-described color filter, counter substrate, and organic EL element.

In the present invention, a sealing material is usually disposed between the color filter and the counter substrate and on the outer periphery of the color filter and the counter substrate. The sealing material is provided for adhering the color filter and the counter substrate and sealing the organic EL element.
As a material used for the sealing material, any material can be used as long as it can adhere the color filter and the opposing base material and can prevent the organic EL element from coming into contact with moisture in the atmosphere. What is used for can be used.

Moreover, in this invention, the insulating layer may be formed in the opening part of the 1st electrode layer formed in the pattern form on the color filter or the opposing base material. The insulating layer is provided to prevent direct contact between the first electrode layer and the second electrode layer.
As an insulating layer, what is generally used for an organic EL element can be used.

  In the present invention, other than the above-described sealing material and insulating layer, necessary configurations can be appropriately selected and added.

  The space between the color filter and the counter substrate of the organic EL display device of the present invention may be filled with an inert gas. The inert gas is not particularly limited as long as it is a general one used for organic EL elements, and examples thereof include nitrogen gas, helium gas, and argon gas. Further, the space between the color filter and the counter substrate may be evacuated.

5. Organic EL Display Device The organic EL display device of the present invention is particularly preferably used for portable devices.
As a method for driving the organic EL display device of the present invention, either a passive matrix or an active matrix can be applied.

  Since the manufacturing method of the organic EL display device of the present invention can be the same as the manufacturing method of a general organic EL display device, description thereof is omitted here.

C. Next, a method for designing a color filter for an organic EL display device according to the present invention will be described.
The method for designing a color filter for an organic EL display device of the present invention includes an organic EL element including a light emitting layer, and is used for an organic EL display device using white light from the light emitting layer as a light emission source. And a white portion on the transparent substrate, having a colored portion having a patterned colored layer provided on the transparent substrate and a white portion provided in a pattern on the transparent substrate. Is a method of designing a color filter for an organic EL display device in which a light absorption layer composed of a resin containing a colorant is formed, and the average transmittance of the white part is within a range of 50% to 98% In the xy chromaticity diagram of the CIE1931-XYZ color system, the transmission chromaticity of the white light transmitted through the white portion is (x, y) = (x1, y1), and the reflection of sunlight in the white portion. The chromaticity is (x, y) = (x2, y2) In addition, the light absorption layer is adjusted so that the change amount of x (Δx = | x2−x1 |) and the change amount of y (Δy = | y2−y1 |) are 0.025 or less. It is a design method of the color filter for organic EL display devices characterized by having an adjustment process.

Here, a method for designing a color filter for an organic EL display device of the present invention will be described with reference to the drawings. FIG. 6 is a process diagram showing an example of the color filter designing method of the present invention. The color filter design method illustrated in FIG. 6 includes an evaluation transparent substrate 11a, and an evaluation light absorption layer 11b formed on the evaluation transparent substrate 11a and made of a resin containing a colorant. The evaluation laminated body 11 which has is formed. When the colorant contained in the evaluation light absorption layer is compared with the waveform of the spectrum of white light and the waveform of the spectrum in the visible light wavelength region of sunlight, the peak of the waveform of sunlight is the waveform of the waveform of white light. A material that absorbs light in a wavelength region larger than the peak is used.
Moreover, in the said laminated body 11 for evaluation, you may arrange | position the opposing base material 11c for evaluation which has transparency on the light absorption layer 11b for evaluation so that it may illustrate to Fig.6 (a) as needed. Such an evaluation laminate 11 can be suitably used for measuring the average transmittance and the chromaticity of white light (evaluation transmission light Lt (11)) transmitted through the evaluation laminate 11. Specifically, the evaluation light emitted from the evaluation transparent substrate 11a is irradiated with white light Lw from the evaluation opposing substrate 11c side toward the evaluation laminate 11 and transmitted through the evaluation laminate 11. By measuring the intensity (luminance) of the transmitted light Lt (11) and calculating the ratio with the intensity of the white light Lw before passing through the evaluation laminate 11, each of the visible light wavelength regions of the evaluation laminate is measured. The transmittance in the wavelength range can be calculated. Further, the spectrum of the transmitted light for evaluation Lt (11) can be obtained. Moreover, an average transmittance can be calculated from the spectrum. In addition, the chromaticity of the above-described transmitted light for evaluation Lt (11) can also be measured.
Further, as the evaluation laminate 11, a reflector 11d having a reflectance of 100% may be disposed on the evaluation light absorption layer 11b. In this case, an interference preventing layer 11e may be further provided between the evaluation light absorbing layer 11b and the reflecting plate 11d. Such an evaluation laminate 11 can be suitably used for measuring the chromaticity of sunlight reflected by the evaluation laminate (evaluation reflected light Lr (11)). Specifically, solar light Ls is irradiated from the evaluation transparent substrate 11a side toward the evaluation laminate 11, and reflected by the reflector 11d and returned to the evaluation transparent substrate 11a side. The chromaticity of the light Lr (11) can be measured. Moreover, the spectrum of the reflected light for evaluation Lr (11) can also be measured as necessary.
Based on the measurement results of the average transmittance of the evaluation laminate, the chromaticity of the transmitted light for evaluation, and the chromaticity of the reflected light for evaluation, the type of the colorant contained in the evaluation light absorption layer as necessary By changing the content of the coloring material and the thickness of the light absorbing layer for evaluation, the average transmittance of the white part is within the range of 50% to 98%, and the transmission chromaticity of the white light transmitted through the white part is changed. When (x, y) = (x1, y1) and the reflected chromaticity of sunlight in the white part is (x, y) = (x2, y2), the amount of change in x (Δx = | x2-x1) The light absorption layer is adjusted so that the amount of change in |) and y (Δy = | y2−y1 |) is 0.025 or less (light absorption layer adjustment step).
Thereby, in this invention, a color filter can be designed so that a white part may have a desired light characteristic and color characteristic by adjusting a light absorption layer.

  According to the present invention, by having the light absorption layer adjustment step, when used in an organic EL display device, it is possible to perform display with good luminance while suppressing the occurrence of display failure due to sunlight reflection. In addition, it is possible to design a color filter for an organic EL display device with little change in the hue of white display indoors and under sunlight.

  Hereinafter, a method for designing a color filter for an organic EL display device of the present invention will be described.

1. Light Absorbing Layer Adjusting Step In the light absorbing layer adjusting step in the present invention, the average transmittance of the white portion is in the range of 50% to 98%, and the white portion in the xy chromaticity diagram of the CIE1931-XYZ color system is used. When the transmission chromaticity of the transmitted white light is (x, y) = (x1, y1) and the reflected chromaticity of sunlight in the white part is (x, y) = (x2, y2), In this step, the light absorption layer is adjusted so that the change amount of x (Δx = | x2-x1 |) and the change amount of y (Δy = | y2-y1 |) are 0.025 or less.

  In this step, normally, the average transmittance of the light absorption layer and Δx and Δy are adjusted so that the average transmittance of the white portion and Δx and Δy satisfy the above-described conditions.

A specific example of the method for adjusting the average transmittance of the light absorbing layer and Δx and Δy will be described. The above-mentioned light characteristics and color characteristics of the light absorption layer are adjusted by the composition and thickness of the light absorption layer, such as the type of the colorant contained in the light absorption layer and the content of the colorant.
As a method for selecting a coloring material in this step, for example, the following method is used. First, the waveform of the spectrum of white light and the waveform of the spectrum of sunlight are compared, and the wavelength region where the peak of the waveform of sunlight is larger than the peak of the waveform of white light is obtained. Next, the coloring material is selected so that the intensity of sunlight can be attenuated as a whole so that the average transmittance of the light absorption layer can be within a predetermined range and light in the above wavelength range can be absorbed. To do. The reason why the white portion Δx and Δy can be set to 0.025 or less by using a colorant that absorbs light in the above wavelength range is described in “A. Color filter for organic EL display device”. Since it was demonstrated in the section of this, description here is abbreviate | omitted. The colorant can be selected by the above method.
Further, the content of the colorant selected by the above method is not particularly limited as long as the average transmittance of the white part can be adjusted to 50% to 98%. In this step, the thickness of the light absorption layer is set to a predetermined value in advance, and the amount of the colorant contained in the light absorption layer having the above thickness is adjusted so that the average transmittance of the white portion is 50% to 98%. It is preferable. Here, since the average transmittance of the light absorption layer is determined by the content of the colorant per unit thickness of the light absorption layer, the amount of the colorant contained in the light absorption layer in advance is set to a predetermined value. The thickness may be adjusted as a value. However, since it is necessary to consider the influence of the size and the like of the organic EL display device with respect to the thickness of the light absorption layer, it is simpler and more preferable when the amount of the coloring material is changed. It is possible to adjust the light absorption layer so as to take a proper value.

  In the above description, for ease of explanation, the case where the influence of the average transmittance and chromaticity of the transparent substrate is not taken into account has been described. However, the light characteristics and color characteristics of the transparent substrate are organic EL display. When the above-described problems in the apparatus are affected, it is possible to adjust the light characteristics and the color characteristics of the white portion using the light absorption layer in consideration of these problems.

In this step, it is preferable to further adjust the composition of the light absorption layer so that the above-described Δx ′ and Δy ′ of the light absorption layer are 0.030 or less.
In this step, it is also preferable to adjust the composition of the light absorption layer such that the above-described Δx ″ and Δy ″ of the light absorption layer are 0.040 or less.
In this step, the composition of the light absorption layer is adjusted so that Δx and Δy are 0.025 or less, Δx ′ and Δy ′ are 0.030 or less, and Δx ″ and Δy ″ are 0.040 or less. It is particularly preferable to do this.
In this case, specifically, the light absorbing layer includes the chromaticity of white light from the organic EL element, the transmitted chromaticity of the colored portion, the reflected chromaticity of sunlight, the chromaticity of the white point due to these, and the like. Adjustment is made by selecting the colorant contained in the.

  Examples of the method for adjusting such a light absorption layer include a white light spectrum, a spectrum in the visible light wavelength range of sunlight, a wavelength range of light absorbed by the colorant, and a colorant addition amount and a decrease in transmittance. And a method of adjusting the light absorption layer by performing a simulation using data such as the relationship between the difference in waveform peak in white light and sunlight and the relationship between the chromaticity difference. When there is no data described above, after measuring the waveform of the spectrum of white light, and after forming the evaluation laminate having the evaluation transparent substrate and the evaluation light absorption layer, as illustrated in FIG. The average transmittance of the evaluation laminate, the chromaticity of the transmitted light for evaluation, the chromaticity of the reflected light for evaluation, and the spectrum of the transmitted light for evaluation and the reflected light for evaluation as required, and the results obtained The method of adjusting a light absorption layer is mentioned by determining the composition and thickness of a light absorption layer based on this.

The said evaluation laminated body is demonstrated.
The transparent substrate for evaluation used in this step is not particularly limited as long as the composition and thickness of the light absorption layer can be determined from the measurement result using the evaluation laminate, but the color filter It is preferable that it is the same kind as the transparent base material used for and has the same thickness. By making the influence of the transparent substrate for evaluation in each characteristic of the laminate for evaluation the same as the transparent substrate actually used, it becomes possible to adjust the composition and thickness of the light absorption layer more accurately. is there.

  Moreover, the light absorption layer for evaluation used in this step is composed of a resin containing a coloring material. The thickness of the evaluation light absorption layer is not particularly limited as long as it can be formed on the evaluation substrate with a uniform thickness. Especially, it is preferable to form with the desired thickness as an actual light absorption layer. This is because it is preferable to adjust each characteristic of the light absorption layer by changing only the content of the colorant in the evaluation light absorption layer.

  About the material used for the said light absorption layer for evaluation, and the formation method, since it can be made to be the same as that of what was demonstrated in the above-mentioned item of "A. Color filter for organic EL display devices," description here Omitted.

Moreover, as a laminated body for evaluation, you may have the opposing base material for evaluation which has transparency on the evaluation absorption layer, a reflecting plate, and an interference prevention layer as needed.
As the reflection plate, one having a reflectance of 100% is usually used. Specifically, a metal plate can be mentioned.
The interference prevention layer is used to prevent light interference at the interface between the light absorption layer and the reflection plate in the evaluation laminate having the reflection plate, and is formed by using, for example, matching oil. It is something that can be done.

  About the measuring method of each characteristic of the evaluation laminated body used for this process, since it can be made to be the same as that of what was demonstrated in the above-mentioned item of "A. Color filter for organic EL display apparatuses", description here Is omitted.

Then, the example which adjusts the thickness and composition of a light absorption layer based on the measurement result of the light absorption layer for evaluation is demonstrated.
In this step, the composition and thickness of the light absorption layer are usually adjusted by changing at least one of the thickness and composition of the evaluation light absorption layer.
Specifically, both the thickness and composition of the evaluation light absorption layer may be changed, or only the composition of the evaluation light absorption layer may be changed so that the light absorption layer has the above-described characteristics. Only the thickness of the light absorbing layer for evaluation may be changed. In the present invention, it is preferable to adjust the composition and thickness of the light absorption layer by changing only the composition of the evaluation light absorption layer.

A method for adjusting the composition of the light absorbing layer for evaluation will be described.
The content of the coloring material in the evaluation light absorption layer is adjusted by the average transmittance. For example, when the average transmittance of the evaluation laminate is too low, the average transmittance can be increased by reducing the content of the coloring material. On the other hand, when the average transmittance is too high, the average transmittance can be lowered by increasing the content of the entire coloring material.

About the kind of coloring material used for the light absorption layer for evaluation, it adjusts using the chromaticity difference of the transmitted light for evaluation, and the reflected light for evaluation. As an example, the following adjustment method can be performed.
First, the chromaticity of the transmitted light for evaluation in the above-described evaluation laminate is (x, y) = (x11, y11), and the chromaticity of the reflected light for evaluation is (x, y) = (x12, y12). , X12-x11, and y12-y11. At this time, when x12-x11 exceeds 0.025, the peak in the red wavelength region of the waveform in the reflected light for evaluation is larger than the peak in the red wavelength region of the waveform in the transmitted light for evaluation. The mixing ratio of the colorant in the light absorption layer can be adjusted so that x12-x11 is 0.025 or less by increasing the ratio of the colorant that absorbs the red wavelength region.
When x12-x11 is less than -0.025, the peak of the blue wavelength region and the green wavelength region of the waveform in the reflected light for evaluation is the peak of the blue wavelength region and the green wavelength region of the waveform in the transmitted light for evaluation. Since it is larger, x12-x11 is set to -0.025 by increasing the ratio of the colorant that absorbs light in the blue wavelength region and the green wavelength region in the mixing ratio of the colorant in the light absorption layer for evaluation. It can adjust so that it may become the above.
When y12-y11 exceeds 0.025, the peak in the green wavelength region of the waveform in the reflected light for evaluation is larger than the peak in the green wavelength region of the waveform in the transmitted light for evaluation. It can adjust so that y12-y11 may be 0.025 or less by making the ratio of the coloring material which absorbs a green wavelength range increase with respect to the compounding ratio of the coloring material in a light absorption layer.
Moreover, when y12-y11 is less than -0.025, the peak of the blue wavelength region of the waveform in the reflected light for evaluation is larger than the peak of the blue wavelength region of the waveform in the transmitted light for evaluation. Y12-y11 can be adjusted to be -0.025 or more by increasing the ratio of the colorant that absorbs light in the blue wavelength range with respect to the mixing ratio of the colorant in the light absorption layer for evaluation. .
Note that the above-described x12-x11 and y12-y11 are adjusted so that both −0.025 ≦ x12−x11 ≦ 0.025 and −0.025 ≦ y12−y11 ≦ 0.025.
When adjusting the chromaticity described above, the adjustment may be performed with reference to the spectrum of the transmitted light for evaluation and the reflected light for evaluation.

2. Others The method for designing the color filter of the present invention is not particularly limited as long as it is a method having the above-described light absorption layer adjustment step, and necessary steps can be appropriately selected and added. For example, a step of adjusting the colored layer so that the colored layer exhibits a predetermined transmittance, Δx ′ and Δy ′ are 0.030 or less, and Δx ″ and Δy ″ are 0.040 or less. be able to.

  The color filter design method of the present invention can be used in a color filter manufacturing method. A specific example will be described in the section “D. Manufacturing method of color filter for organic EL display device” described later.

  The color filter designed by using the color filter design method of the present invention can be the same as that described in the section “A. Color filter for organic EL display device” described above. The description in is omitted.

D. Manufacturing method of color filter for organic EL display device The manufacturing method of the color filter for organic EL display device of the present invention includes an organic EL element including a light emitting layer, and an organic EL using white light from the light emitting layer as a light source. Used in a display device, comprising a transparent substrate, a colored portion provided in a pattern on the transparent substrate and having a patterned colored layer, and a white portion provided in a pattern on the transparent substrate. A method for producing a color filter for an organic EL display device in which a light absorption layer composed of a resin containing a colorant is formed in a white portion on the transparent substrate, wherein the average transmission of the white portion The transmission chromaticity of the white light transmitted through the white portion in the xy chromaticity diagram of the CIE1931-XYZ color system is (x, y) = (x1, y1) And the white part of the sunlight When the reflection chromaticity is (x, y) = (x2, y2), the change amount of x (Δx = | x2-x1 |) and the change amount of y (Δy = | y2-y1 |) are 0. A light absorption layer adjusting step for adjusting the light absorption layer so as to be 025 or less, and a light absorption for forming the light absorption layer adjusted by the design step in the white portion on the transparent substrate And a layer forming step.

FIG. 7 is a process diagram for explaining an example of the method for producing a color filter of the present invention.
In the method for producing a color filter of the present invention, first, although not shown, a design process including a light absorption layer adjustment process described in the above-mentioned section “C. Method for designing color filter for organic EL display device” is performed. Is called. Further, as illustrated in FIG. 7A, before forming the light absorption layer, the colored layers 2R, 2G, and 2B are formed in a pattern on the colored portion 10C (10R, 10G, and 10B) on the transparent substrate 1. It may be formed. Next, the light absorption layer 3 adjusted by the light absorption layer adjustment step is formed on the white portion 10W on the transparent substrate 11 (light absorption layer formation step). Specifically, first, a light absorbing layer composition 3 ′ containing a colorant and a resin such as a photosensitive resin is applied to the entire surface of the transparent substrate 1 (FIG. 7B), and the photomask 60 and the like are applied. After the pattern exposure is performed by irradiating the exposure light Le (FIG. 7C), the light absorption layer 3 can be formed by performing a development process (FIG. 7D). The color filter 10 can be manufactured through the above steps. Although not shown, in the present invention, the light absorption layer forming step may be performed before the step of forming the colored layer.
Note that the reference numerals not described in FIG. 7 can be the same as the reference numerals described in FIG.

  According to the present invention, by using the above-described design process, when used in an organic EL display device, it is possible to perform display with good luminance while suppressing the occurrence of display defects due to sunlight reflection. It is possible to manufacture a color filter for an organic EL display device with little change in the hue of white display under sunlight.

  Hereinafter, the manufacturing method of the color filter of this invention is demonstrated.

1. Design Process In the design process of the present invention, the average transmittance of the white part is in the range of 50% to 98%, and the white light transmitted through the white part in the xy chromaticity diagram of the CIE1931-XYZ color system is transmitted. When the transmission chromaticity is (x, y) = (x1, y1) and the reflection chromaticity of sunlight in the white part is (x, y) = (x2, y2), the amount of change in x (Δx = | X2-x1 |) and the amount of change in y (Δy = | y2-y1 |) are 0.025 or less, a step including a light absorption layer adjustment step of adjusting the light absorption layer.

  Since the light absorption layer adjusting step in this step has been described in the above-mentioned section “A. Method for designing color filter for organic EL display device”, description thereof is omitted here.

  Moreover, this process may include processes other than the light absorption layer adjustment process mentioned above. As such a process, for example, the arbitrary process described in the above-mentioned section “C. Method for designing color filter for organic EL display device” can be given.

2. Light absorption layer formation process The light absorption layer formation process in this invention is a process of forming the light absorption layer adjusted by the said design process in the said white part on the said transparent base material.

As a method for forming the light absorbing layer used in this step, a known method can be used as a general method for forming a resin layer.
In this step, a light absorbing layer composition containing a colorant and a resin is usually prepared so as to have the composition of the light absorbing layer adjusted by the above-described design step, and the light absorbing layer is described above. The light absorption layer is formed by applying the light absorption layer composition with a predetermined thickness to the white part on the substrate so as to have the thickness of the light absorption layer adjusted by the above.

About the coloring material and resin used for the said composition for light absorption layers, since it can be made to be the same as that of what was demonstrated in the above-mentioned item of "A. Color filter for organic EL display devices," description here Omitted.
When the light absorption layer is formed on the pattern, a photolithography method can be preferably used. In this case, a photosensitive resin is used as the resin.
Moreover, the said composition for light absorption layers may contain various additives, such as a solvent, a photoreaction initiator, and a dispersing agent other than the coloring material and resin which were mentioned above. About the said solvent and additive, since it can be made to be the same as that used for the formation method of a general resin layer, description here is abbreviate | omitted.

A known method can be used as a method for applying the light absorbing layer composition.
In addition, the exposure light, photomask, development conditions, and the like in the case where the light absorption layer is formed using a photolithography method in this step can be the same as those used in a general color filter manufacturing method. Therefore, explanation here is omitted.
Further, the light absorption layer may be formed by a method other than the photolithography method. Examples of such a method include an ink jet method and a printing method.

  The light absorption layer formed in this step can be the same as that described in the above-mentioned section “A. Color filter for organic EL display device”, and thus description thereof is omitted here.

3. Other Steps The method for producing the color filter of the present invention is not particularly limited as long as it has the design step and the light absorption layer forming step described above. Usually, in addition to the light absorption layer forming step, a colored layer forming step of forming a colored layer in a pattern on the colored portion on the transparent substrate is provided. In addition, since it can be set as the process in the manufacturing method of a general color filter about the colored layer formation process, description here is abbreviate | omitted.
In the present invention, in addition to the above-described light absorption layer forming step and colored layer forming step,
For example, you may have the process of forming a light-shielding part, the process of forming TFT, etc.

4). Color filter for organic EL display device The color filter produced by the method for producing a color filter of the present invention can be the same as that described in the above-mentioned section "A. Color filter for organic EL display device". Therefore, explanation here is omitted.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has any configuration that has substantially the same configuration as the technical idea described in the claims of the present invention and that exhibits the same effects. Are included in the technical scope.

  Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples.

[Example 1]
(Preparation of curable resin composition A)
In a polymerization tank, 63 parts by mass of methyl methacrylate (MMA), 12 parts by mass of acrylic acid (AA), 6 parts by mass of 2-hydroxyethyl methacrylate (HEMA), and 88 parts by mass of diethylene glycol dimethyl ether (DMDG) are charged. After stirring and dissolving, 7 parts by mass of 2,2′-azobis (2-methylbutyronitrile) was added and dissolved uniformly.
Then, it stirred at 85 degreeC under nitrogen stream for 2 hours, and also was made to react at 100 degreeC for 1 hour.
Further, 7 parts by mass of glycidyl methacrylate (GMA), 0.4 parts by mass of triethylamine, and 0.2 parts by mass of hydroquinone were added to the obtained solution, and the mixture was stirred at 100 ° C. for 5 hours to obtain a copolymer resin solution ( A solid content of 50%) was obtained.

Next, the following materials were stirred and mixed at room temperature to obtain a curable resin composition.
<Composition of curable resin composition A>
-Copolymer resin solution (solid content 50%) ... 16 parts by mass-Dipentaerythritol pentaacrylate (Sartomer SR399)
... 24 parts by mass · Ortho-cresol novolac type epoxy resin (Epico Shell Epoxy Epicoat 180S70) · 4 parts by mass · 2-methyl-1- (4-methylthiophenyl) -2-morpholinopropan-1-one
... 4 parts by mass, diethylene glycol dimethyl ether ... 52 parts by mass

(Formation of light shielding part)
First, the following components were mixed and sufficiently dispersed with a sand mill to prepare a black pigment dispersion.
<Composition of black pigment dispersion>
Black pigment (Mitsubishi Chemical Corporation # 2600) 20 parts by mass Polymer dispersion (Bic Chemie Japan, Ltd. Disperbyk 111)
... 16 parts by mass, solvent (diethylene glycol dimethyl ether) ... 64 parts by mass

Next, the following components were sufficiently mixed to obtain a light shielding part composition.
<Composition of composition for light shielding part>
-Black pigment dispersion liquid: 50 parts by mass-Curable resin composition A: 20 parts by mass-Diethylene glycol dimethyl ether: 30 parts by mass

The light shielding part composition was applied with a spin coater and dried at 100 ° C. for 3 minutes to form a light shielding part forming layer.
The light-shielding part forming layer is exposed to a light-shielding pattern with an ultra-high pressure mercury lamp, and then developed with a 0.05 wt% potassium hydroxide aqueous solution, and then the substrate is left to stand in an atmosphere at 230 ° C. for 30 minutes for heat treatment. To form a light shielding part.

(Formation of red colored layer)
A red curable resin composition having the following composition was applied by spin coating so as to have predetermined color coordinates, and then dried in an oven at 70 ° C. for 3 minutes.
Next, a photomask is placed at a distance of 100 μm from the coating film of the red curable resin composition, and ultraviolet rays are applied only to the region corresponding to the colored layer formation region using a 2.0 kW ultrahigh pressure mercury lamp by a proximity aligner. Irradiated for 10 seconds.
Subsequently, it was immersed in 0.05 wt% potassium hydroxide aqueous solution (liquid temperature 23 degreeC) for 1 minute, and alkali development was carried out, and only the uncured part of the coating film of a red curable resin composition was removed.
Thereafter, the substrate is allowed to stand in an atmosphere of 170 ° C. for 15 minutes, so that the heat treatment is performed to form a pattern (hereinafter referred to as a red colored layer) on the entire frame portion forming region serving as the red pixel in the display region and the non-display region. , Also called a relief pattern).

<Composition of red curable resin composition>
・ C. I. Pigment Red 177 3 parts by mass / C.I. I. Pigment Red 254 4 parts by mass, polysulfonic acid type polymer dispersant 3 parts by mass, curable resin composition A 23 parts by mass, 3-methoxybutyl acetate 67 parts by mass

(Formation of green colored layer)
Next, in the same process as the formation of the red relief pattern, a green curable resin composition having the following composition is applied on the side on which the red relief pattern is formed so as to have a predetermined color coordinate for display. A pattern (also referred to as a relief pattern) made of a green colored layer was formed on the green pixel in the region.

<Composition of green curable resin composition>
・ C. I. Pigment Green 58: 7 parts by mass / C.I. I. Pigment Yellow 138 1 part by mass, polysulfonic acid type polymer dispersant 3 parts by mass, the curable resin composition A 22 parts by mass, 3-methoxybutyl acetate 67 parts by mass

(Formation of blue colored layer)
Further, in the same process as the formation of the red relief pattern, a blue curable resin composition having the following composition is applied on the side on which the green relief pattern is formed so as to have predetermined color coordinates. A pattern composed of a blue colored layer (also referred to as a relief pattern) was formed on each blue pixel.

<Composition of blue curable resin composition>
・ C. I. Pigment Blue 1 ... 5 parts by mass, polysulfonic acid type polymer dispersant ... 3 parts by mass, the curable resin composition A ... 25 parts by mass, 3-methoxybutyl acetate ... 67 parts by mass

(Formation of light absorption layer)
Further, in the same process as the formation of the red relief pattern, the resin composition for the light absorption layer having the following composition is applied on the side on which the blue relief pattern is formed so as to have a predetermined color coordinate. A pattern (also referred to as a relief pattern) made of a light absorption layer was formed in the white portion of the region.
<Composition of the resin composition for light absorption layers>
・ C. I. Pigment Blue 15: 6 1.5 parts by mass. I. Pigment Violet 23 1.5 parts by weight, polysulfonic acid type polymer dispersant 1 part by weight, the curable resin composition A 29 parts by weight, 3-methoxybutyl acetate 67 parts by weight

  The color filter was obtained by performing the above process.

[Example 2]
A color filter was produced in the same manner as in Example 1 except that the following light absorbing layer resin composition was used.
<Composition of the resin composition for light absorption layers>
・ C. I. Pigment Blue 15: 6 1.5 parts by mass, polysulfonic acid type polymer dispersant 0.5 parts by mass, the curable resin composition A 31 parts by mass, 3-methoxybutyl acetate 67 parts by mass

[Example 3]
A color filter was produced in the same manner as in Example 1 except that the following light absorbing layer resin composition was used.
<Composition of the resin composition for light absorption layers>
・ C. I. Pigment Blue 15: 6: 2.0 parts by mass / C.I. I. Pigment Violet 23 ... 1.0 part by mass, polysulfonic acid type polymer dispersant ... 0.5 part by mass, the curable resin composition A ... 31 parts by mass, 3-methoxybutyl acetate ... 67 parts by mass

[Example 4]
A color filter was produced in the same manner as in Example 1 except that the following light absorbing layer resin composition was used.
<Composition of the resin composition for light absorption layers>
・ C. I. Pigment Red 254: 1.5 parts by mass / C.I. I. Pigment Violet 23 1.5 parts by mass, polysulfonic acid type polymer dispersant 0.5 parts by mass, the curable resin composition A 31 parts by mass, 3-methoxybutyl acetate 67 parts by mass

[Example 5]
A color filter was produced in the same manner as in Example 1 except that the following light absorbing layer resin composition was used.
<Composition of the resin composition for light absorption layers>
-Black pigment dispersion liquid-10 parts by mass-Curable resin composition A-40 parts by mass-Diethylene glycol dimethyl ether-50 parts by mass

[Comparative example]
A color filter was produced in the same manner as in Example 1 except that the following white layer resin composition was used.
<Composition of resin composition for white layer>
・ The curable resin composition A: 50 parts by mass • Diethylene glycol dimethyl ether: 50 parts by mass

[Evaluation]
(Average transmittance of white part)
The average transmittance of the white part of the color filters of Examples 1 to 5 and Comparative Example was measured using a microspectroscope OSP-SP2000 (manufactured by OLYMPUS). The results are shown in Table 1.

(Color filter chromaticity)
The transmitted light source of the color filters of Examples 1 to 5 and the comparative example is a C light source (C in FIG. 8), the reflected light source is a D65 light source (D65 in FIG. 8), the transmitted light (Lt1) in the white part, For the reflected light (Lr1), the mixed color transmitted light (Lt2) of the colored portion, and the mixed color reflected light (Lr2) of the colored portion, the chromaticity in the xy chromaticity diagram of the CIE1931-XYZ color system is shown as a luminance meter SR-3 UL1 (Made by TOPCON), chromaticity difference (Lt1−Lr1) between transmitted light in white part and reflected light in white part (Lt1−Lr1), chromaticity difference between transmitted light in white part and mixed color transmitted light in colored part (Lt1) -Lt2), and the difference in chromaticity (Lr1−Lr2) between the reflected light of the white part and the mixed color reflected light of the colored part. The results are shown in Tables 2 and 3. In addition, FIG. 8 is a figure explaining the light measured in the Example. Although not shown in FIG. 8, a reflector having a reflectance of 100% was used for the measurement of reflected light and mixed color reflected light.
A transmission spectrum and a reflection spectrum were measured using a microspectroscope OSP-SP2000 (manufactured by OLYMPUS), and the chromaticity coordinates were calculated by converting the transmission spectrum into a C light source and the reflection spectrum into a D65 light source.
Note that the chromaticity of the C light source is (x, y) = (0.310, 0.316).

About Examples 1-5, the difference of the color of the transmitted light of a white part and reflected light was small, respectively, and the change of the white display of the white part by the presence or absence of D65 light source could be made small (Table 2, Table). 3).
Moreover, about Examples 1-4, the difference of the hue of the transmitted light of a white part and the color-mixed transmitted light of a coloring part and the hue of the reflected light of a white part and the color-mixed reflected light of a coloring part was able to be made small ( In Table 2 and Table 3, it is indicated by ◎).
On the other hand, in the comparative example, the difference in hue between the transmitted light and reflected light in the white portion was large, and the change in white display of the white portion due to the presence or absence of the D65 light source was clearly observed (indicated by x in Table 3). Moreover, the difference between the intensity of the reflected light of the white portion D65 light source and the intensity of the colored reflected light of the colored portion D65 light source was large, and good visibility could not be ensured.

DESCRIPTION OF SYMBOLS 1 ... Transparent base material 2R ... Red colored layer 2G ... Green colored layer 2B ... Blue colored layer 3 ... Light absorption layer 10 ... Color filter for organic EL display devices 10C ... Colored part 10R ... Red colored part 10G ... Green colored part 10B ... Blue colored portion 10W ... White portion 11 ... Evaluation laminate 11a ... Evaluation transparent substrate 11b ... Evaluation light absorbing layer 20 ... Opposite substrate 30 ... Organic EL element 32 ... Organic EL layer Ls ... Sunlight Lw ... White light Lt: White light transmitted through the white part (transmitted light)
Lr: Sunlight reflected from the white part (reflected light)
Lt (11): White light (transmitted light) transmitted through the evaluation laminate
Lr (11): Sunlight reflected from the evaluation laminate (reflected light)

Claims (6)

A color filter for an organic electroluminescence display device used in an organic electroluminescence display device having an organic electroluminescence element including a light emitting layer and using white light from the light emitting layer as a light emission source,
A transparent substrate;
A colored portion provided in a pattern on the transparent substrate and having a patterned colored layer;
A white portion provided in a pattern on the transparent substrate,
A light absorption layer composed of a resin containing a coloring material is formed on the white portion on the transparent substrate,
The average transmittance of the white part is in the range of 50% to 98%;
In the xy chromaticity diagram of the CIE1931-XYZ color system, the transmission chromaticity of the white light transmitted through the white portion is (x, y) = (x1, y1), and the reflected chromaticity of sunlight in the white portion. Is (x, y) = (x2, y2), the change amount of x (Δx = | x2-x1 |) and the change amount of y (Δy = | y2-y1 |) are 0.025 or less. A color filter for an organic electroluminescence display device, comprising:   In the xy chromaticity diagram of the CIE1931-XYZ color system, the transmission chromaticity of the white light transmitted through the white part is (x, y) = (x1, y1), and the white point is determined by the transmission chromaticity of the colored part. When the chromaticity of (x, y) = (x3, y3) is assumed, the change amount of x (Δx ′ = | x3-x1 |) and the change amount of y (Δy ′ = | y3-y1 |) are It is 0.030 or less, The color filter for organic electroluminescent display apparatuses of Claim 1 characterized by the above-mentioned.   In the xy chromaticity diagram of the CIE1931-XYZ color system, the reflection chromaticity of sunlight in the white part is (x, y) = (x2, y2), and the white point by the reflection chromaticity of sunlight in the coloring part When the chromaticity of x is (x, y) = (x4, y4), the change amount of x (Δx ″ = | x4-x2 |) and the change amount of y (Δy ″ = | y4-y2 |) are The color filter for an organic electroluminescence display device according to claim 1 or 2, wherein the color filter is 0.040 or less. An organic electroluminescence display device color filter; a counter substrate; an organic electroluminescence element formed between the color filter for organic electroluminescence display device and the counter substrate; An organic electroluminescence display device using white light from a layer as a light emission source,
The color filter for the organic electroluminescence display device,
A transparent substrate;
A colored portion provided in a pattern on the transparent substrate and having a patterned colored layer;
A white portion provided in a pattern on the transparent substrate,
A light absorption layer composed of a resin containing a coloring material is formed on the white portion on the transparent substrate,
The average transmittance of the white part is in the range of 50% to 98%;
In the xy chromaticity diagram of the CIE1931-XYZ color system, the transmission chromaticity of the white light transmitted through the white portion is (x, y) = (x1, y1), and the reflected chromaticity of sunlight in the white portion. Is (x, y) = (x2, y2), the change amount of x (Δx = | x2-x1 |) and the change amount of y (Δy = | y2-y1 |) are 0.025 or less. An organic electroluminescence display device comprising: An organic electroluminescence device including a light emitting layer, used in an organic electroluminescence display device using white light from the light emitting layer as a light emission source, and provided in a pattern on a transparent base material and the transparent base material Light having a colored portion having a colored layer and a white portion provided in a pattern on the transparent substrate, and the white portion on the transparent substrate is made of a resin containing a colorant A method for designing a color filter for an organic electroluminescence display device in which an absorption layer is formed,
The average transmittance of the white part is in the range of 50% to 98%, and the transmission chromaticity of the white light transmitted through the white part in the xy chromaticity diagram of the CIE1931-XYZ color system is (x, y) = (X1, y1) and the reflected chromaticity of sunlight in the white part is (x, y) = (x2, y2), the amount of change in x (Δx = | x2-x1 |) and y A color filter for an organic electroluminescence display device comprising: a light absorption layer adjustment step of adjusting the light absorption layer so that a change amount (Δy = | y2−y1 |) of 0.025 or less Design method. An organic electroluminescence device including a light emitting layer, used in an organic electroluminescence display device using white light from the light emitting layer as a light emission source, and provided in a pattern on a transparent base material and the transparent base material Light having a colored portion having a colored layer and a white portion provided in a pattern on the transparent substrate, and the white portion on the transparent substrate is made of a resin containing a colorant A method for producing a color filter for an organic electroluminescence display device in which an absorption layer is formed,
The average transmittance of the white part is in the range of 50% to 98%, and the transmission chromaticity of the white light transmitted through the white part in the xy chromaticity diagram of the CIE1931-XYZ color system is (x, y) = (X1, y1) and the reflected chromaticity of sunlight in the white part is (x, y) = (x2, y2), the amount of change in x (Δx = | x2-x1 |) and y A design step including a light absorption layer adjustment step of adjusting the light absorption layer such that the amount of change (Δy = | y2−y1 |) is 0.025 or less;
A light absorption layer forming step of forming the light absorption layer adjusted by the design step on the white portion on the transparent substrate;
The manufacturing method of the color filter for organic electroluminescent display apparatuses characterized by having.

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