Color filter, colored resin composition, liquid crystal display device, organic electroluminescence display device, micro-led display device, and method for manufacturing color filter

Abstract

To provide a color filter that can improve an object color inclusion rate, and can suppress a decrease in a tristimulus value Y without narrowing the display range of object colors.SOLUTION: The present invention is a color filter in which chromaticity coordinates (x, y) of a greenish yellow pixel in an XYZ color system chromaticity diagram are located within a pentagon surrounded by (0.420, 0.536), (0.430, 0.550), (0.424, 0.561), (0.282, 0.689), and (0.321, 0.629), and chromaticity coordinates (x, y) of a bluish green pixel in the XYZ color system chromaticity diagram are located within a pentagon surrounded by (0.187, 0.496), (0.253, 0.610), (0.218, 0.722), (0.171, 0.627), and (0.143, 0.473).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a wide-gamut color reproduction technology for color liquid crystal display devices and the like, and in particular to a color filter that focuses on the object color obtained by reflection from a white light source. [Background technology]

[0002] Patent Document 1 discloses an invention relating to a color filter suitable for a color liquid crystal display device. The color filter of the invention in Patent Document 1 has colored pixels of multiple colors, including yellow pixels, and the pixels other than the yellow pixels include red pixels, green pixels, and blue pixels. These colored pixels are formed using a colorant, a photopolymerizable monomer, a photopolymerization initiator, a transparent resin, and a solvent.

[0003] The yellow pixels of the color filter of the invention of Patent Document 1 are pixels with a film thickness of less than 5 μm that are formed using a yellow composition containing a dye together with a yellow pigment, and the chromaticity coordinates (x, y) on the XYZ color system chromaticity diagram are located within a rectangle surrounded by (0.550, 0.450), (0.400, 0.600), (0.350, 0.550), and (0.510, 0.430), as shown in Figure 1. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-95313 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the color filter of the invention of Patent Document 1 and common three-primary color filters with red, green, and blue pixels have the problem of low object color coverage and reduced color reproducibility of the same color gamut because they do not include much of the cyan color gamut that exists as an object color.On the other hand, they include much of the bright green color gamut that does not exist as an object color, resulting in a problem of reduced tristimulus value Y (see Figure 2).

[0006] The present invention has been made in light of the above circumstances, and aims to provide a color filter that can improve the object color coverage rate by including greenish yellow pixels and bluish green pixels, and can also suppress a decrease in the tristimulus value Y without narrowing the display range of object colors. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides a color filter having red, blue, greenish yellow, and bluish green pixels, wherein the chromaticity coordinates (x, y) of the greenish yellow pixels in an XYZ color system chromaticity diagram are located within a pentagon surrounded by (0.420, 0.536), (0.430, 0.550), (0.424, 0.561), (0.282, 0.689), and (0.321, 0.629), and the chromaticity coordinates (x, y) of the bluish green pixels in an XYZ color system chromaticity diagram are located within a pentagon surrounded by (0.187, 0.496), (0.253, 0.610), (0.218, 0.722), (0.171, 0.627), and (0.143, 0.473). [Effects of the Invention]

[0008] The color filter of the present invention is characterized in that the chromaticity coordinates (x, y) of the greenish yellow pixel in the XYZ color system chromaticity diagram are located within a pentagon surrounded by (0.420, 0.536), (0.430, 0.550), (0.424, 0.561), (0.282, 0.689), and (0.321, 0.629), and the chromaticity coordinates (x, y) of the bluish green pixel in the XYZ color system chromaticity diagram are located within a pentagon surrounded by (0.187, 0.496), (0.253, 0.610), (0.218, 0.722), (0.171, 0.627), and (0.143, 0.473).

[0009] Therefore, the coverage of object colors is high, and in particular, most of the cyan color gamut that exists as an object color is included, resulting in excellent color reproducibility of the same color gamut. It also has the effect of suppressing an increase in the gamut of bright greens that do not exist as object colors. As a result, it has the effect of maintaining a high tristimulus value Y without narrowing the display gamut of object colors. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 2 is a diagram showing an example of chromaticity coordinates (x, y) in an XYZ color system chromaticity diagram of each color pixel used in the color filter of the present invention. [Figure 2] FIG. 1 is a diagram showing an example of chromaticity coordinates (x, y) in an XYZ color system chromaticity diagram of each color pixel used in a conventional four-color color filter. [Figure 3] FIG. 1 is a plan view illustrating an example of a color filter of the present invention. [Figure 4] 1 is a cross-sectional view illustrating an example of a color filter of the present invention. [Figure 5] 10 is a characteristic diagram showing the emission spectrum of a backlight source for calculating chromaticity coordinates (x, y) and tristimulus value Y. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] The present invention will be described in detail below with reference to Fig. 1. The color filter 100 of the present invention is a color filter having a greenish yellow pixel 10, a bluish green pixel 20, a red pixel 30, and a blue pixel 40 (see Figs. 3 and 4). The chromaticity coordinates (x, y) of the greenish yellow pixel 10 in the XYZ color system chromaticity diagram are (0.420, 0.536), (0.430, 0.550), (0.424, 0.561), and (0.282, 0.536). The bluish green pixel 20 is located within a pentagonal region 1 bounded by (0.187, 0.469), (0.253, 0.610), (0.218, 0.722), (0.171, 0.627), and (0.143, 0.473) in the XYZ color system chromaticity diagram, and the chromaticity coordinates (x, y) of the bluish green pixel 20 are located within a pentagonal region 2 bounded by (0.187, 0.469), (0.253, 0.610), (0.218, 0.722), (0.171, 0.627), and (0.143, 0.473).

[0012] The pentagonal region 1 enclosed by the chromaticity coordinates (x, y) of the greenish yellow pixel 10 is located in a pixel region located on the greener side of the yellow pixel of Patent Document 1, which makes it possible to provide a pentagonal region 2 enclosed by the chromaticity coordinates (x, y) of the bluish green pixel 20 in the XYZ color system chromaticity diagram. In other words, the presence of region 1 of the greenish yellow pixel 10 makes it possible to provide region 2 of the bluish green pixel 20 located on the bluer side of the green pixel of Patent Document 1. This encompasses much of the color gamut 7 of cyan, which exists as an object color (see FIGS. 1 and 2), improving the color reproducibility of the cyan color.

[0013] The object color coverage rate in this invention refers to the occupancy rate of Pointer's Data (the range of colors in which the surface color of an object exists, reported by M.R. Pointer in 1980) used as an evaluation index of object color, and is the rate at which Pointer's Data marked with a circle in Figures 1 and 2 fall within the rectangular area surrounded by white lines at chromaticity coordinates (x, y) on the XYZ color system chromaticity diagram. With the four-color color filter of the invention in Patent Document 1 and general three-primary color filters, most of the cyan color gamut 7 is not included, and the object color coverage rate across the entire color gamut is up to about 86%, but with the color filter using the pixels of this invention, it is possible to ensure an object color coverage rate of 87% or more across the entire color gamut.

[0014] At the same time, since the color gamut 1 of the greenish yellow pixel 10 is located on the yellow side of the color gamut 5 of the conventional green pixel in Patent Document 1, an increase in the color gamut 8 of bright greens that do not exist as object colors is suppressed, improving utilization efficiency. As a result, it is possible to maintain a high tristimulus value Y corresponding to the lightness of object colors without narrowing the display gamut of object colors. Specifically, it is possible to set the tristimulus value Y of the greenish yellow pixel 10 to 40 to 90% in the XYZ color system chromaticity diagram, and the tristimulus value Y of the bluish green pixel 20 to 10 to 60% in the XYZ color system chromaticity diagram.

[0015] If the tristimulus Y values ​​of both pixels are within the above-mentioned range, the tristimulus Y value of white display will also be relatively improved. The chromaticity coordinates (x, y) and tristimulus Y values ​​in the XYZ colorimetric chromaticity diagram of the present invention are values ​​calculated from the transmittance measured for each pixel using a high-precision CF substrate optical inspection device (LCF-100MA 2480C; manufactured by Otsuka Electronics Co., Ltd.) and the backlight light source spectrum. Examples of backlight light sources include, but are not limited to, a B-LED+R·G phosphor backlight that combines a blue LED with red- and green-emitting phosphors to produce white light, and exhibits an emission spectrum as shown in Figure 5. In Figure 5, the horizontal axis represents wavelength λ (nm) and the vertical axis represents radiance W (sr·m 2 The backlight light source spectrum can be measured using a spectroradiometer.

[0016] From the viewpoint of increasing the object color coverage rate while increasing the tristimulus value Y value for white display, the chromaticity coordinates (x, y) of the greenish yellow pixel 10 in the XYZ color system chromaticity diagram are preferably located within a pentagonal region bounded by (0.420, 0.536), (0.430, 0.550), (0.424, 0.561), (0.301, 0.666), and (0.321, 0.629), and more preferably within a hexagonal region bounded by (0.420, 0.536), (0.430, 0.550), (0.424, 0.561), (0.345, 0.628), (0.325, 0.638), and (0.321, 0.629).

[0017] From the viewpoint of widening the color gamut, the chromaticity coordinates (x, y) of the greenish yellow pixel 10 in the XYZ color system chromaticity diagram preferably satisfy y>-0.8916x+0.9213, more preferably y>-0.8916x+0.9263, even more preferably y>-0.8916x+0.9293, and even more preferably y>-0.8916x+0.9313.

[0018] The film thickness of the greenish yellow pixel 10 is preferably 1 μm or more and 7 μm or less. From the viewpoints of manufacturing and processability, it is preferably 5 μm or less, more preferably 4 μm or less, and even more preferably 3 μm or less. By making the thickness of the pixel 10 within this range, it is possible to prevent pattern defects such as pinholes and shape defects such as undercuts.

[0019] The colorant for the greenish yellow pixel 10 is not particularly limited as long as it is a colorant that can be adjusted to the above color gamut, and an example of adjustment is to mix a predetermined amount of a yellow colorant and a green colorant.

[0020] Examples of yellow colorants include CI Pigment Yellow (hereinafter abbreviated as PY) 12, 13, 17, 20, 24, 83, 86, 93, 95, 109, 110, 117, 125, 129, 137, 138, 139, 147, 148, 150, 153, 154, 166, 168, and 185.

[0021] Other products include CISolvent Yellow 2, 3, 7, 12, 13, 14, 16, 18, 19, 21, 25, 25:1, 27, 28, 29, 30, 33, 34, 36, 42, 43, 44, 47, 56, 62, 72, 73, 77, 79, 81, 82, 83, 83:1, 88, 89, 90, 93, 94, 96, 98, 104, 107, 114, 116, 117, 124, 130, 131, 133, 135, 141, 143, 145, 146, 157, 160:1, 161, 162, 163, 167, 169, 172, 174, 175, 176, 179, and 180. , 181, 182, 183, 184, 185, 186, 187, 189, 190, 191, CIAcidYellow17, 23, 25, 36, 38, 42, 44, 72, 78, CIBasicYellow11, 23, 25, 28, 41, CIDirectYellow26, 27, 28, 33, 44, 50, 86, 142, CIReactiveYellow1, 2, 4, 14, 16, CIVatYellow2, 12, 20, 33, and CIDisperseYellow3, 4, 5, 7, 23, 33, 42, 60, 64.

[0022] Examples of green colorants include CI Pigment Green (hereinafter abbreviated as PG) 1, 2, 4, 7, 8, 10, 13, 14, 15, 17, 18, 19, 26, 36, 38, 39, 45, 48, 50, 51, 54, 55, 58, and 59, and CI Solvent Green 1, 3, 4, 5, 7, 28, 29, 32, 33, 34, and 35.

[0023] Among these, as an example of preparation by mixing predetermined amounts of a yellow colorant and a green colorant, from the viewpoints of lightfastness, high color reproducibility, and a high tristimulus Y value, it is preferable to use one or more yellow colorants of PY83, 110, 125, 138, 139, 150, 154, 168, and 185 and one or more green colorants of PG7, 58, and 59. In this case, it is preferable to adjust the weight ratio of the yellow colorant to the green colorant to 50:50 to 99:1. Furthermore, from the viewpoints of lightfastness, high color reproducibility, and a high tristimulus Y value, it is preferable to contain one or more yellow colorants of CI Pigment Yellow 138, 139, 150, and 185 and one or more green colorants of CI Pigment Green 58 and 59.

[0024] The greenish yellow colored resin composition of the present invention contains one or more yellow colorants selected from CI Pigment Yellow 138, 139, 150, and 185, and one or more green colorants selected from CI Pigment Green 58 and 59. When a pixel is formed, the colored resin composition has chromaticity coordinates (x, y) in the XYZ color system chromaticity diagram that are located within a pentagon surrounded by (0.420, 0.536), (0.430, 0.550), (0.424, 0.561), (0.282, 0.689), and (0.321, 0.629).

[0025] The colorant for the bluish green pixel 20 is also not particularly limited as long as it is a colorant that can be adjusted to the above-mentioned color gamut, and examples include a combination of a blue colorant and a green colorant, a yellow colorant and a green colorant, or a combination of one or more types of green colorants mixed in predetermined amounts.

[0026] Examples of blue colorants include CI Pigment Blue (hereinafter abbreviated as PB) 15, 15:1, 15:2, 15:3, 15:4, 15:6, 16, 17, 19, 22, 56, 60, 64, and 80. Examples of green colorants and yellow colorants include the colorants described above.

[0027] Among these, as an example of a mixture prepared by mixing predetermined amounts of blue and green colorants, from the viewpoint of lightfastness and high color reproducibility, it is preferable to use one or more of the blue colorants PB15, PB15:3, PB15:4, PB15:6, PB16, and PB80 and the green colorant PG59. In this case, the weight ratio of the blue colorant to the green colorant should be 1:99 to 30:70.

[0028] Alternatively, as an example of a composition prepared by mixing predetermined amounts of a yellow colorant and a green colorant, the composition may contain one or more green colorants of PG7, 58, and 59 and one or more yellow colorants of PY83, 110, 125, 138, 139, 150, 154, 168, and 185, with the weight ratio of the green colorant to the yellow colorant being 100:0 to 70:30.

[0029] Alternatively, as an example of adjusting by mixing one or more kinds of green colorants in predetermined amounts, the layer may contain one or more green colorants selected from PG7, PG58, and PG59.

[0030] As noted above, it is preferred that the bluish green pixel contains CI PigmentGreen59.

[0031] The chromaticity coordinates (x, y) of the bluish green pixel 20 in the XYZ color system chromaticity diagram are preferably located within a pentagonal area surrounded by (0.187, 0.496), (0.253, 0.610), (0.206, 0.641), (0.171, 0.627), and (0.143, 0.473) from the viewpoint of increasing the object color coverage rate and the tristimulus value Y value of white display, and It is more preferable that the position is within the rectangular area bounded by (0.187,0.496), (0.253,0.610), (0.206,0.641), and (0.171,0.627), and it is even more preferable that the position is within the rectangular area bounded by (0.187,0.496), (0.253,0.610), (0.206,0.641), and (0.185,0.573).

[0032] The bluish green colored resin composition of the present invention contains a green colorant CI Pigment Green 59, and is a colored resin composition that, when a pixel is formed, is located within a pentagon surrounded by chromaticity coordinates (x, y) in the XYZ color system chromaticity diagram, which are (0.187, 0.496), (0.253, 0.610), (0.218, 0.722), (0.171, 0.627), and (0.143, 0.473).

[0033] From the viewpoint of widening the color gamut, the chromaticity coordinates (x, y) of the bluish green pixel 20 in the XYZ color system chromaticity diagram preferably satisfy y>5.4783x-0.7667, more preferably y>5.4783x-0.7617, even more preferably y>5.4783x-0.7587, and even more preferably y>5.4783x-0.7567.

[0034] Furthermore, the chromaticity coordinates (x, y) of the bluish green pixel 20 in the XYZ colorimetric chromaticity diagram preferably satisfy y>-0.8517x+1.935, more preferably y>-0.8517x+2.035, and even more preferably y>-0.8517x+2.055, from the viewpoint of increasing the tristimulus value Y of white display and facilitating pixel pattern processability.

[0035] Furthermore, from the viewpoint of facilitating pixel pattern processability, the chromaticity coordinates (x, y) of the bluish green pixel 20 in the XYZ color system chromaticity diagram preferably satisfy y<2.011x+0.2825, more preferably y<2.011x+0.2805, even more preferably y<2.011x+0.2705, and even more preferably y<2.011x+0.2505.

[0036] The film thickness of the bluish green pixel 20 is preferably 1 μm or more and 7 μm or less. From the viewpoints of manufacturing and processability, it is preferably 5 μm or less, more preferably 4 μm or less, and even more preferably 3 μm or less. By making the thickness of the pixel 10 within this range, it is possible to prevent pattern defects such as pinholes and shape defects such as undercuts.

[0037] When the chromaticity coordinates (x, y) of the greenish yellow pixel in the XYZ color system chromaticity diagram are (a, b) and the chromaticity coordinates (x, y) of the bluish green pixel in the XYZ color system chromaticity diagram are (c, d), from the viewpoint of green color reproducibility, from the viewpoint of increasing the tristimulus value Y value of white display, and from the viewpoint of facilitating pixel pattern processability, It is preferable to satisfy the relation 0.582≦(bd) / (ac)×0.279+(a×db×c) / (ac)≦0.600.

[0038] From the viewpoint of green color reproducibility, (bd) / (ac)×0.279+(a×db×c) / (ac) is preferably 0.582 or more, more preferably 0.583 or more, even more preferably 0.584 or more, and even more preferably 0.585 or more. Furthermore, from the viewpoint of excellent green color reproducibility, increasing the tristimulus value Y value of white display, and facilitating pixel pattern processability, (bd) / (ac)×0.279+(a×db×c) / (ac) is preferably 0.600 or less, more preferably 0.597 or less, even more preferably 0.594 or less, and even more preferably 0.591 or less.

[0039] The chromaticity coordinates (x, y) of the red pixel 30 in the XYZ color system chromaticity diagram are not particularly limited as long as they are chromaticity coordinates that can adjust the greenish yellow pixel 10 and the bluish green pixel 20 to the above-mentioned color gamut 1 and color gamut 2. However, it is preferable to adjust the red pixel 30 to be located within a rectangular region 3 bounded by (0.660, 0.270), (0.720, 0.280), (0.660, 0.330), and (0.700, 0.340) using the red colorant described below alone, multiple red colorants described below, or a mixture of the red colorant described below with other colorants such as the yellow colorant, the purple colorant described below, or the orange colorant described below (see FIG. 1).

[0040] Examples of red colorants include CI Pigment Red (hereinafter abbreviated as PR) 48, 97, 122, 123, 144, 149, 166, 168, 177, 179, 180, 192, 209, 215, 216, 217, 220, 223, 224, 226, 227, 228, 240, 254, 264, 269, and 291.

[0041] Other examples include CISolventRed 1, 2, 3, 4, 8, 16, 17, 18, 19, 23, 24, 25, 26, 27, 30, 33, 35, 41, 43, 45, 48, 49, 52, 68, 69, 72, 73, 83:1, 84:1, 89, 90, 90:1, 91, 92, 106, 109, 110, 111, 118, 119, 122, 124, 125, 127, 130, 132, 135, 141, 143, 145, 146, 149, 150, 151, 155, 160, 161, 164, 164:1, 165, 166, 168, 169, 172, 175, 179, 180, 181, 182, 195, 196, 197, 198, 207, 208, 210 ,212, 214, 215, 218, 222, 223, 225, 227, 229, 230, 233, 234, 235, 236, 238, 239, 240, 241, 242, 243, 244, 245, 247, 248 and CIDirectRed4, 23, 31, 75, 76, 79, 80, 81, 83, 84, 149, 22 4, CI Sulphur Red 5, 6, 7, CI V At Red 13, 21, 23, 28, 29, CI Reactive Red 8, 22, 46, 120, CI Disperse Red 4, 11, 54, 55, 58, 65, 73, 127, 129, 141, 196, 210, 229, 354, 356, etc.

[0042] Among these, PR122, PR123, PR177, PR220, PR228, PR240, PR242, PR250, PR254, and PR291 are preferred from the viewpoints of lightfastness, high color reproducibility, and high tristimulus Y value.

[0043] Other colorants include the yellow colorant, the purple colorant described below, and the orange colorant described below.

[0044] Examples of purple colorants include CiPigmentViolet (hereinafter abbreviated as PV) 1, 19, 23, 27, 29, 30, 32, 37, 40, 42, and 50.

[0045] Orange colorants include Ci Pigment Orange 1, 2, 5, 13, 15, 16, 17, 18, 19, 31, 34, 36, 38, 40, 42, 43, 51, 52, 55, 59, 60, 61, 62, 71, and 73.

[0046] Inorganic pigments may also be used, such as metal oxide powders, metal sulfide powders, and metal powders, including titanium oxide, yellow lead, zinc yellow, red iron oxide (iron (III) oxide), cadmium red, ultramarine, Prussian blue, chromium oxide green, and cobalt green. The inorganic pigments may be used in combination with the organic colorants described above to ensure good coatability, sensitivity, developability, and the like while maintaining a balance between saturation and brightness.

[0047] The chromaticity coordinates (x, y) of the blue pixel 40 in the XYZ color system chromaticity diagram are not particularly limited as long as they are chromaticity coordinates that can ultimately adjust the greenish yellow pixel 10 and the bluish green pixel 20 to the above-mentioned color gamut 1 and color gamut 2. However, it is preferable to adjust the blue pixel 40 to be located within a rectangular region 4 bounded by (0.130, 0.040), (0.170, 0.040), (0.110, 0.090), and (0.160, 0.080) using the blue colorant alone, multiple blue colorants, or a mixture of the blue colorant and another colorant such as the purple colorant (see FIG. 1).

[0048] The patterns of the red, blue, greenish yellow, and bluish green pixels may be square, rectangular, circular, triangular, or other shapes, but from the viewpoint of adjusting the chromaticity of white display, it is preferable that the area of ​​the red pixel 30 be 1.1 to 1.6 times the area of ​​the greenish yellow pixel 10 or the bluish green pixel 20. Also, from the viewpoint of adjusting the chromaticity of white display, it is preferable that the area of ​​the blue pixel 40 be 1.1 to 2.8 times the area of ​​the greenish yellow pixel 10 or the bluish green pixel 20 (see FIG. 3).

[0049] The reason why the area of ​​the red pixel 30 is set to be 1.1 to 1.6 times the area of ​​the greenish yellow pixel 10 or the bluish green pixel 20 is that the color gamut covered by the red pixel 30 is larger than the color gamut covered by the greenish yellow pixel 10 or the color gamut covered by the bluish green pixel 20, but is significantly smaller than the sum of the color gamut covered by the greenish yellow pixel 10 and the bluish green pixel 20, and by setting the magnification in this manner, the chromaticity coordinates (x, y) when white is displayed will become the desired values.

[0050] Furthermore, the reason why the magnifications of the areas of the red pixel 30 and the blue pixel 40 are different from the area of ​​the greenish yellow pixel 10 or the bluish green pixel 20 is that the tristimulus value Y value of the blue pixel 40 is lower than the tristimulus value Y value of the red pixel 30, and if the area of ​​the blue pixel 40 is not made relatively large, the colors in the color gamut near blue will be weaker.

[0051] The method for producing the greenish yellow pixel 10, the bluish green pixel 20, the red pixel 30, and the blue pixel 40 is not particularly limited, but may involve preparing colored resin compositions adjusted to the desired colors and applying each of these colored resin compositions to a substrate 50 to form a pattern. That is, the method for producing a color filter of the present invention is a method for producing a color filter of the present invention, in which colored resin compositions for red, blue, greenish yellow, and bluish green pixels are applied to a substrate to form red, blue, greenish yellow, and bluish green pixels. The colored resin compositions of each color preferably contain, in addition to the colorants of the respective colors, a binder, a polymerizable compound, a solvent, additives, etc.

[0052] Examples of binders include thermoplastic resins, thermosetting resins, and photosensitive resins. The precursor of the photosensitive resin may contain a monomer or oligomer that cures upon irradiation to form a cured film. A photopolymerization initiator or a curing agent may also be included as appropriate. The colored resin composition may be prepared for application by appropriately mixing and stirring these components.

[0053] Examples of thermoplastic resins include acrylic, vinyl, olefin, and saturated polyester resins. Examples of thermosetting resins include urethane, epoxy, polyimide, and unsaturated polyester resins. Examples of photosensitive resin monomers or oligomers include cyanoacrylate, urethane acrylate, glycidyl acrylate, and erythritol acrylate compounds.

[0054] From the viewpoint of processability, the binder is preferably an alkali-soluble resin. Furthermore, from the viewpoint of processability of a fine pattern and prevention of undercut of bluish green pixels, the binder is preferably an alkali-soluble resin having a tricyclodecanyl skeleton. Furthermore, from the viewpoint of prevention of undercut of bluish green pixels, the weight ratio of the unit having a tricyclodecanyl skeleton contained in the alkali-soluble resin having a tricyclodecanyl skeleton is preferably 2% by mass or more and 30% by mass or less, more preferably 2% by mass or more and 20% by mass or less, based on the alkali-soluble resin having a tricyclodecanyl skeleton.

[0055] Examples of the solvent include organic solvents such as aromatic hydrocarbons, ketones, alcohols, esters, and glycols. Examples of the photopolymerization initiator include alkylphenones, oximes, azos, peroxides, and phosphines. Examples of the curing agent include isocyanates, amines, and acid anhydrides.

[0056] When a thermoplastic resin is used, the binder is used in an amount of 30 to 700 parts by weight, preferably 60 to 450 parts by weight, per 100 parts by weight of the colorant.When a thermosetting resin or a monomer or oligomer of a photosensitive resin is used, the binder is used in an amount of 10 to 400 parts by weight, preferably 20 to 250 parts by weight, per 100 parts by weight of the colorant.

[0057] Examples of the substrate 50 include glass substrates such as soda glass, alkali-free glass, and aluminosilicate glass, and transparent films such as polyester, acrylic, polycarbonate, and cyclic olefin. Methods for applying the colored resin composition onto the substrate include inkjet printing, screen printing, spin coating, slit die coating, roll coating, reverse coating, dip coating, and spray coating.

[0058] As a patterning method, for thermoplastic resins and thermosetting resins, a method using a plate with a desired pattern can be mentioned, and for photosensitive resins, a method of exposing to light with a desired photomask and developing with a developer such as an alkaline aqueous solution can be mentioned. After patterning, the coating can be dried to evaporate the solvent, and then cured by thermal baking for thermosetting resins or by irradiation with radiation for photosensitive resins.

[0059] By arranging the pixels formed by these manufacturing methods in parallel in the gaps of a black matrix (not shown), a color filter 100 is manufactured that can improve usage efficiency without narrowing the display range of object colors and can improve the tristimulus value Y when displaying white, compared to the color filter of Patent Document 1 and conventional three-primary color filters (see Figures 3 and 4).

[0060] The manufactured color filter 100 can be used in a liquid crystal display device such as that described in Patent Document 1, and can also be used as a substitute for a circular polarizer placed in front of pixels of an organic electroluminescent display device or a micro LED display device. That is, the liquid crystal display device of the present invention comprises the color filter of the present invention, the organic electroluminescent display device of the present invention comprises the color filter of the present invention, and the micro LED display device of the present invention comprises the color filter of the present invention. [Example]

[0061] The present invention will be described below with reference to examples, but these examples are merely illustrative and the present invention is not limited to these examples. The materials used in each example and comparative example are as follows.

[0062] <Production Example 1 (Preparation of Polymerizable Compound Solutions (A1) and (B1))> Polymerizable compound solution (A1) was prepared by dissolving and diluting 50 g of KAYARD DPHA (dipentaerythritol hexaacrylate) manufactured by Nippon Kayaku Co., Ltd. in 50 g of PGMEA (polyethylene glycol monomethyl ether acetate). Polymerizable compound solution (B1) was prepared by dissolving and diluting 50 g of PE3A (pentaerythritol triacrylate) manufactured by Daicel Allnex Co., Ltd. in 50 g of PGMEA.

[0063] <Production Example 2 (Preparation of Green Colorant Dispersion Liquid (C1))> A slurry was prepared by mixing 150 g of PG58, 125 g of "BYK" (registered trademark) LPN6919, a polymer dispersant solution (60% by mass propylene glycol monomethyl ether solution) manufactured by BYK Japan, 100 g of "CYCLOMER" (registered trademark) ACA250, an acrylic resin (45% by mass dipropylene glycol monomethyl ether solution) manufactured by Daicel Chemical Industries, Ltd., and 625 g of propylene glycol monomethyl ether. The beaker containing the slurry was connected to a Dyno-Mill via a tube, and dispersion treatment was carried out for 8 hours at a peripheral speed of 14 m / s using zirconia beads with a diameter of 0.5 mm as media, to prepare green colorant dispersion (C1).

[0064] <Production Example 3 (Preparation of Yellow Colorant Dispersion (C2))> A yellow colorant dispersion (C2) was prepared in the same manner as in Production Example 1, except that PY150 was used instead of PG58.

[0065] <Production Example 4 (Preparation of Red Colorant Dispersion Liquid (C3))> A red colorant dispersion (C3) was prepared in the same manner as in Production Example 1, except that PR254 was used instead of PG58.

[0066] <Production Example 5 (Preparation of Blue Colorant Dispersion Liquid (C4))> A blue colorant dispersion (C4) was prepared in the same manner as in Production Example 1, except that PB15:6 was used instead of the PG58.

[0067] <Production Example 6 (Preparation of Purple Colorant Dispersion (C5))> A purple colorant dispersion (C5) was prepared in the same manner as in Production Example 1, except that PV23 was used instead of PG58.

[0068] <Production Example 7 (Preparation of Green Colorant Dispersion (C6))> A green colorant dispersion (C6) was prepared in the same manner as in Production Example 1, except that PG59 was used instead of PG58.

[0069] <Production Example 8 (Synthesis of binder resin solution (D1))> 20 g of methacrylic acid, 20 g of styrene, 15 g of tricyclodecanyl methacrylate, 20 g of methyl methacrylate, 3 g of 2,2'-azobis(2-methylbutyronitrile), and 150 g of PGMEA were charged into a polymerization vessel and stirred at 90 °C for 2 hours under a nitrogen atmosphere. The liquid temperature was then raised to 100 °C and the reaction was continued for another 5 hours. Next, the polymerization vessel was purged with air, and 9 g of glycidyl methacrylate, 1.2 g of dimethylbenzylamine, and 0.2 g of p-methoxyphenol were added to the resulting reaction solution and stirred at 110 °C for 6 hours. The resulting solution was diluted with PGMEA to obtain an alkali-soluble resin solution (B2) with a solids content of 35 wt% (alkali-soluble resin double bond equivalent: 1396 g / mol, weight ratio of units having a tricyclodecanyl skeleton: 17.0 wt%). The acid value of the alkali-soluble resin was measured in a 0.1 mol / L potassium hydroxide-ethanol solution using an automatic potentiometer AT-610 manufactured by Kyoto Electronics Manufacturing Co., Ltd., and was found to be 106.8 (mgKOH / g). Furthermore, the weight-average molecular weight calculated in terms of polystyrene was calculated using a GPC device and found to be 12,000.

[0070] Example 1: Four-color filter To a 50 mL plastic bottle were added 1.27 g of the polymerizable compound solution (A1) obtained in Production Example 1, 0.85 g of the polymerizable compound solution (B1), 1.21 g of the binder resin solution (D1) obtained in Production Example 8, 0.11 g of "ADEKA ARCLES" (registered trademark) NCI831 (manufactured by ADEKA CORPORATION) as a photopolymerization initiator, 0.71 g of the green colorant dispersion liquid (C1) obtained in Production Example 2, 13.41 g of the yellow colorant dispersion liquid (C2) obtained in Production Example 3, and 12.45 g of PGMEA as an organic solvent, and the mixture was stirred for 3 hours to prepare a greenish colored resin composition for yellow pixels (C-GY1).

[0071] Next, 1.27 g of the polymerizable compound solution (A1) obtained in Production Example 1, 0.85 g of the polymerizable compound solution (B1), 1.21 g of the binder resin solution (D1) obtained in Production Example 8, 0.11 g of "ADEKA ARCLES" (registered trademark) NCI831 (manufactured by ADEKA CORPORATION) as a photopolymerization initiator, 13.84 g of the green colorant dispersion liquid (C6) obtained in Production Example 7, 0.28 g of the yellow colorant dispersion liquid (C2) obtained in Production Example 3, and 12.45 g of PGMEA as an organic solvent were added to a 50 mL plastic bottle and stirred for 3 hours to produce a bluish green pixel colored resin composition (C-BG1).

[0072] Furthermore, to a 50 mL plastic bottle were added 1.85 g of the polymerizable compound solution (A1) obtained in Production Example 1, 1.23 g of the polymerizable compound solution (B1), 3.35 g of the binder resin solution (D1) obtained in Production Example 6, 0.46 g of "ADEKA ARCLES" (registered trademark) NCI730 (manufactured by ADEKA CORPORATION) as a photopolymerization initiator, 7.41 g of the blue colorant dispersion liquid (C4) obtained in Production Example 5, 0.82 g of the purple colorant dispersion liquid (C5) obtained in Production Example 6, and 14.87 g of PGMEA as an organic solvent, and the mixture was stirred for 3 hours to prepare a colored resin composition for blue pixel (C-B1).

[0073] Furthermore, to a 50 mL plastic bottle were added 1.05 g of the polymerizable compound solution (A1) obtained in Production Example 1, 0.70 g of the polymerizable compound solution (B1), 1.00 g of the binder resin solution (D1) obtained in Production Example 6, 0.14 g of "ADEKA ARCLES" (registered trademark) NCI831 (manufactured by ADEKA CORPORATION) as a photopolymerization initiator, 11.63 g of the red colorant dispersion liquid (C3) obtained in Production Example 4, and 15.49 g of PGMEA as an organic solvent, and the mixture was stirred for 3 hours to prepare a colored resin composition for red pixel (C-R1).

[0074] Each of the colored resin compositions obtained above was applied to a 0.5 mm thick glass substrate using a slit die coater and dried at 100°C for 3 minutes. Thereafter, the substrate was exposed to 40 mJ of i-rays through a photomask with a 20 μm line and space pattern. Next, the substrate was shower-developed for 50 seconds using a 0.2 mass% tetramethylammonium hydroxide aqueous solution at 23°C, washed with pure water, and baked for 30 minutes at 230°C to obtain a color filter consisting of greenish yellow pixels, bluish green pixels, red pixels, and blue pixels.

[0075] Each pixel of the formed color filter was measured using a high-definition CF substrate optical inspection device (LCF-100MA 2480C; manufactured by Otsuka Electronics Co., Ltd.), and the chromaticity coordinates (x, y) of each pixel on the XYZ colorimetric chromaticity diagram, the tristimulus value Y value of each pixel, the chromaticity coordinates (x, y) when white was displayed, and the tristimulus value Y value when white was displayed were calculated. In addition, each chromaticity coordinate (x, y) was connected by a line, and the object color coverage rate was calculated from the area of ​​Pointer's Data within the area enclosed by this line.

[0076] The results are shown in Tables 2-1 and 2-2. As a result, the object color coverage rate was 91.7%, showing good color reproduction of the cyan color gamut, and white display was also good. The chromaticity coordinates (x, y) of the red pixel were (0.680, 0.319), and the tristimulus value Y was 17.1. The chromaticity coordinates (x, y) of the blue pixel were (0.150, 0.054), and the tristimulus value Y was 9.5. Furthermore, the greenish yellow pixel satisfied y > -0.8916x + 0.9213 (hereinafter, Equation 1) (denoted as ◯).

[0077] <Examples 2 to 36> Four-color color filter A greenish yellow pixel colored resin composition was prepared in the same manner as in Example 1, except that the weight ratio of the green colorant dispersion (C1) to the yellow colorant dispersion (C2) was changed. A bluish green pixel colored resin composition was prepared in the same manner as in Example 1, except that the weight ratio of the green colorant dispersion (C6) to the yellow colorant dispersion (C2) or the weight ratio of the green colorant dispersion (C6) to the blue colorant dispersion (C4) was changed by using the blue colorant dispersion (C4) instead of the yellow colorant dispersion (C2) (Tables 1-1 and 1-2). Color filters were obtained and evaluated using these colored resin compositions, as well as the blue pixel colored resin composition and the red pixel colored resin composition of Example 1. The results are shown in Tables 2-1 and 2-2. The chromaticity coordinates (x, y) of the red pixel were (0.680, 0.319), and the tristimulus value Y was 17.1. The chromaticity coordinates (x, y) of the blue pixel were (0.150, 0.054), and the tristimulus Y value was 9.5. Although there were slight differences in performance, if the chromaticity coordinates (x, y) of the greenish yellow pixel and the bluish green pixel in the XYZ color system chromaticity diagram were within these ranges, the object color coverage rate was 87.6% or higher, and the tristimulus Y value when white was displayed was 26.6% or higher, resulting in good color reproduction of the cyan color gamut and good white display.

[0078] [Table 1-1]

[0079] [Table 1-2]

[0080] [Table 2-1]

[0081] [Table 2-2]

[0082] <Comparative Example 1> Three-color color filter A 50 mL plastic bottle was charged with 1.27 g of the polymerizable compound solution (A1) obtained in Production Example 1, 0.85 g of the polymerizable compound solution (B1), 1.21 g of the binder resin solution (D1) obtained in Production Example 6, 0.11 g of "ADEKA ARCLES" (registered trademark) NCI831 (manufactured by ADEKA Corporation) as a photopolymerization initiator, 9.88 g of the green colorant dispersion (C1) obtained in Production Example 2, 4.24 g of the yellow colorant dispersion (C2) obtained in Production Example 3, and 12.45 g of PGMEA as an organic solvent, and the mixture was stirred for 3 hours to prepare a green colored resin composition. A color filter was also prepared using this green pixel colored resin composition, the blue pixel colored resin composition of Example 1, and the red pixel colored resin composition, and evaluated. The chromaticity coordinates (x, y) of the green pixel were (0.265, 0.690), and the tristimulus value Y was 51.5. The chromaticity coordinates (x, y) of the red pixel were (0.680, 0.319), and the tristimulus Y value was 17.1. The chromaticity coordinates (x, y) of the blue pixel were (0.150, 0.054), and the tristimulus Y value was 9.5. When the chromaticity coordinates (x, y) on the XYZ colorimetric chromaticity diagram were within these ranges, the object color coverage rate was low at 86.9%. When white was displayed, the chromaticity coordinates (x, y) on the XYZ colorimetric chromaticity diagram were (0.272, 0.258), and the tristimulus Y value was low at 25.9.

[0083] <Comparative Example 2> 4-color color filter To a 50 mL plastic bottle were added 1.27 g of the polymerizable compound solution (A1) obtained in Production Example 1, 0.85 g of the polymerizable compound solution (B1), 1.21 g of the binder resin solution (D1) obtained in Production Example 6, 0.11 g of "ADEKA ARCLES" (registered trademark) NCI831 (manufactured by ADEKA CORPORATION) as a photopolymerization initiator, 7.06 g of the green colorant dispersion liquid (C1) obtained in Production Example 2, 7.06 g of the yellow colorant dispersion liquid (C2) obtained in Production Example 3, and 12.45 g of PGMEA as an organic solvent, and the mixture was stirred for 3 hours to prepare a greenish yellow pixel colored resin composition.

[0084] Next, 1.27 g of the polymerizable compound solution (A1) obtained in Production Example 1, 0.85 g of the polymerizable compound solution (B1), 1.21 g of the binder resin solution (D1) obtained in Production Example 6, 0.11 g of "ADEKA ARCLES" (registered trademark) NCI831 (manufactured by ADEKA CORPORATION) as a photopolymerization initiator, 10.59 g of the green colorant dispersion liquid (C6) obtained in Production Example 7, 3.53 g of the blue colorant dispersion liquid (C4) obtained in Production Example 5, and 12.45 g of PGMEA as an organic solvent were added to a 50 mL plastic bottle and stirred for 3 hours to prepare a bluish colored resin composition for green pixels. Furthermore, color filters were obtained and evaluated using these colored resin compositions, as well as the colored resin composition for blue pixels and the colored resin composition for red pixels of Example 1. The chromaticity coordinates (x, y) of the greenish yellow pixel were (0.277, 0.689), and the tristimulus Y value was 50.8. The chromaticity coordinates (x, y) of the bluish green pixel were (0.129, 0.335), and the tristimulus Y value was 8.1. The chromaticity coordinates (x, y) of the red pixel were (0.680, 0.319), and the tristimulus Y value was 17.1. The chromaticity coordinates (x, y) of the blue pixel were (0.150, 0.054), and the tristimulus Y value was 9.5. Furthermore, when the chromaticity coordinates (x, y) on the XYZ color system chromaticity diagram were within these ranges, the object color coverage rate was high at 98.0%, but when white was displayed, the chromaticity coordinates (x, y) on the XYZ color system chromaticity diagram were (0.264, 0.262), and the tristimulus value Y when white was displayed was low at 21.4. [Explanation of symbols]

[0085] 1. Chromaticity coordinate region of greenish yellow pixel 2. Chromaticity coordinate region of the bluish green pixel 3. Chromaticity coordinate region of red pixel 4. Chromaticity coordinate region of blue pixel 5. Chromaticity coordinates of conventional green pixels 6. Chromaticity coordinates of conventional yellow pixel 7. Gamut of cyan that exists as an object color 8. Bright green color gamut that does not exist as an object color 10 Greenish yellow pixel 20 Bluish green pixel 30 red pixels 40 blue pixels 50...Base material 100···Color filter

Claims

1. A color filter having red, blue, greenish yellow, and bluish green pixels, A color filter in which the chromaticity coordinates (x, y) of the greenish yellow pixel in an XYZ color system chromaticity diagram are located within a pentagon surrounded by (0.420, 0.536), (0.430, 0.550), (0.424, 0.561), (0.282, 0.689), and (0.321, 0.629), and the chromaticity coordinates (x, y) of the bluish green pixel in an XYZ color system chromaticity diagram are located within a pentagon surrounded by (0.187, 0.496), (0.253, 0.610), (0.218, 0.722), (0.171, 0.627), and (0.143, 0.473).

2. The greenish yellow pixel contains one or more yellow colorants selected from C.I. Pigment Yellow 83, 110, 125, 138, 139, 150, 154, 168, and 185, and one or more green colorants selected from C.I. Pigment Green 7, 58, and 59, and the weight ratio of the yellow colorant to the green colorant is 50:50 to 99:

1. The color filter according to claim 1.

3. 3. The color filter according to claim 1, wherein the chromaticity coordinates (x, y) of the greenish yellow pixel in the XYZ color system chromaticity diagram satisfy y>-0.8916x+0.9213.

4. 3. The color filter according to claim 1, wherein the bluish green pixel contains C.I. Pigment Green 59.

5. The bluish green pixel contains one or more blue colorants selected from C.I. Pigment Blue 15, 15:3, 15:4, 15:6, 16, and 80, and C.I. Pigment Green 59, and the weight ratio of the blue colorant to the green colorant is 1:99 to 30:

70. The color filter according to claim 1 or 2.

6. The bluish green pixel contains one or more green colorants selected from C.I. Pigment Green 7, 58, and 59, and one or more yellow colorants selected from C.I. Pigment Yellow 83, 110, 125, 138, 139, 150, 154, 168, and 185, and the weight ratio of the green colorant to the yellow colorant is 100:0 to 70:

30. The color filter according to claim 1 or 2.

7. 3. The color filter according to claim 1, wherein the chromaticity coordinates (x, y) of the red pixel in an XYZ color system chromaticity diagram are located within a rectangle surrounded by (0.660, 0.270), (0.720, 0.280), (0.660, 0.330), and (0.700, 0.340), and the chromaticity coordinates (x, y) of the blue pixel in an XYZ color system chromaticity diagram are located within a rectangle surrounded by (0.130, 0.040), (0.170, 0.040), (0.110, 0.090), and (0.160, 0.080).

8. 3. The color filter according to claim 1, wherein the area of ​​the blue pixel is 1.1 to 2.8 times the area of ​​the greenish yellow or bluish green pixel.

9. 3. The color filter according to claim 1, wherein the area of ​​the red pixel is 1.1 to 1.6 times the area of ​​the greenish yellow or bluish green pixel.

10. A colored resin composition containing one or more yellow colorants selected from C.I. Pigment Yellow 138, 139, 150, and 185, and one or more green colorants selected from C.I. Pigment Green 58 and 59, wherein, when a pixel is formed, the chromaticity coordinates (x, y) in the XYZ color system chromaticity diagram are (0.420, 0.536), (0.430, 0.550), (0.424, 0.561), (0.282, 0.689), and (0.321, 0.629) in the pentagon.

11. A colored resin composition containing a green colorant of C.I. Pigment Green 59, which, when a pixel is formed, has chromaticity coordinates (x, y) in the XYZ color system chromaticity diagram of (0.187, 0.496), (0.253, 0.610), (0.218, 0.722), (0.171, 0.627), and (0.143, 0.473) located within a pentagon.

12. When the chromaticity coordinates (x, y) of the greenish yellow pixel in the XYZ color system chromaticity diagram are (a, b) and the chromaticity coordinates (x, y) of the bluish green pixel in the XYZ color system chromaticity diagram are (c, d), 0.582≦(b-d) / (ac)×0.279+(a×d-b×c) / (ac)≦0.600 3. The color filter according to claim 1, wherein the above formula (I) is satisfied.

13. A liquid crystal display device comprising the color filter according to claim 1 or 2.

14. 3. An organic electroluminescence display device comprising the color filter according to claim 1.

15. A micro LED display device comprising the color filter according to claim 1 or 2.

16. 3. The method for producing a color filter according to claim 1 or 2, wherein a colored resin composition for red, blue, greenish yellow, and bluish green pixels is applied onto a substrate to form red, blue, greenish yellow, and bluish green pixels.

Images