JP5604968B2 - Green colorant composition for color filter, color filter substrate and liquid crystal display device - Google Patents

Description

  The present invention relates to a green colorant composition, a color filter substrate, and a liquid crystal display device used for a color liquid crystal display device and the like.

  Liquid crystal display devices are used in various applications such as televisions, notebook computers, personal digital assistants, digital cameras, desktop monitors, etc., taking advantage of characteristics such as light weight, thinness, and low power consumption.

  Recently, in order to faithfully reproduce the vivid colors of crimson roses that could not be expressed on conventional CRT TVs and the beautiful green color of tropical seas, the color reproduction range was expanded to 100% of the NTSC standard. It has been strongly demanded to approach%. Note that the chromaticity coordinates (x, y) in the XYZ color system chromaticity diagram of red, green, and blue colors are red (0.670, 0.330), green (0.210, 0.710), and blue (0. 150, 0.060), the NTSC standard ratio is 100%.

  In order to obtain a liquid crystal display with a wide color reproduction range and high brightness, it is important to select the pigment used in the red, green and blue pixels of the color filter so as to match the light transmission characteristics of the backlight. In many cases, the pigment is used after being toned at a certain ratio. On the other hand, in order to obtain a liquid crystal display with a high contrast ratio, it is important to disperse the pigment used in each pixel of the color filter into fine and stable particles. Various studies have been made on dispersion stabilization.

  Patent Document 1 describes a green colorant composition and a color filter using a highly chlorinated copper phthalocyanine green pigment and a yellow pigment. In this method, a highly chlorinated copper phthalocyanine pigment, C.I. I. The combination of Pigment Yellow (PY) 138 and PY185 increases the color purity up to y = 0.65 of the chromaticity coordinates (x, y) of the C light source of the green pixel, but the contrast ratio is as low as 2500, Super high color purity and ultra high contrast ratio are not compatible. Similarly, Patent Document 2 also achieves high color purity of green pixels by combining Pigment Green (PG) 7 with PY185, PY139, etc., but the contrast ratio is as low as 1000 or less and ultra-high color purity. And ultra-high contrast ratio are not compatible. As described above, conventionally, it has been extremely difficult to stabilize nano-dispersion of yellow pigments such as PY185 and PY139 having strong coloring power, and thus it has been impossible to achieve both high color purity and high contrast ratio of green pixels.

  On the other hand, Patent Document 3 describes a color filter in which yellow, magenta, and cyan pixels are added in addition to red, green, and blue pixels. When four red, green, and blue pixels are used, the color reproduction range is as follows. It is 100% of NTSC standard. However, in this method, since it is essential to set the number of pixels to four or more, there is a problem that the cost is increased because the number of processes is increased as compared with a color filter including three pixels of normal red, green, and blue.

  Patent Document 4 describes a color filter having yellow, magenta, and cyan pixels. In this method, as a pigment in a cyan pixel, C.I. I. Although Pigment Blue (PB) 16 is used alone, the color reproduction range of the color filter has a problem that the color reproduction range is narrow with an NTSC ratio of 30% or less.

JP 2010-2550 A JP 2003-185830 A JP 2008-52239 A JP 2003-84116 A

  An object of the present invention is to provide a green colorant composition for a color filter that is a thin film and has an ultrahigh color purity and an ultrahigh contrast ratio. It is another object of the present invention to provide a color filter having an extremely high contrast ratio, an extremely wide color reproduction range, and excellent white balance.

1. In a green colorant composition for a color filter containing at least a resin, a solvent, and a pigment, C.I. I. Pigment Blue 16 and a yellow pigment, and C.I. in all pigments in the composition. I. A green colorant composition for a color filter, wherein the content of Pigment Blue 16 is 5 to 40% by mass.
2. Further, C.I. I. The green colorant composition for a color filter according to 1, which contains CI Pigment Green 58.
3. The yellow pigment is C.I. I. Pigment yellow 129 and C.I. I. 3. The green colorant composition for color filters according to 1 or 2, which contains CI Pigment Yellow 150.
4). A color filter substrate in which red pixels, green pixels, and blue pixels are formed on a transparent substrate, wherein the green pixels are formed of the green colorant composition for color filters according to any one of items 1 to 3. A color filter substrate characterized by that.
5. The red pixel is C.I. I. Pigment red 177 and C.I. I. Formed from a red colorant composition containing CI Pigment Red 254, and the blue pixel is C.I. I. Pigment blue 15: 6 and C.I. I. 5. The color filter substrate according to claim 4, which is formed of a blue colorant composition containing Pigment Violet 23.
A liquid crystal display device comprising the color filter substrate according to 6.4 or 5.

  The green colorant composition of the present invention contains PB16 and a yellow pigment, and the content of PB16 in the pigment is 5 to 40% by mass. A high contrast ratio can be obtained. The green colorant composition of the present invention preferably contains PB16, PG58, PY129, and PY150 as pigments, so that the green pixel can be made into a thin film with ultrahigh color purity, ultrahigh contrast ratio, and high brightness. . The color filter having a red pixel, a green pixel, and a blue pixel according to the present invention has an ultra-high contrast ratio because the green pixel is formed of the green colorant composition as described above, and in combination with the LED backlight, NTSC An extremely wide color reproduction range exceeding 100% can be achieved, and the white balance is also excellent. Therefore, the liquid crystal display device manufactured using the color filter of the present invention has a high display quality and a high color reproduction range.

Transmission spectrum of a green pixel obtained from the green colorant composition of Example 5 Transmission spectrum of green pixel obtained from the green colorant composition of Example 9 Transmission spectrum of a green pixel obtained from the green colorant composition of Comparative Example 1 Transmission spectrum of a green pixel obtained from the green colorant composition of Comparative Example 3

  The green colorant composition for a color filter of the present invention contains at least a resin, a solvent, and a pigment, contains PB16 and a yellow pigment as the pigment, and the content of PB16 in the pigment is 5 to 40% by mass. It is characterized by. In order to increase the color purity of the green pixel of the color filter, in the transmission spectrum of the visible region (400 to 700 nm) of the green pixel, the transmittance of the green region (495 to 580 nm) is increased and the blue region (400 to 400 to 400 nm). It is important to cut the transmittance in the 495 nm) and red regions (580-700 nm).

  In the transmission spectrum of the green pixel of the color filter, the present invention contains PB16 and a yellow pigment as pigments in the green colorant composition, and the PB16 content in the pigment is 5 to 40% by mass. It has been found that the transmittance of 495 to 580 nm is selectively increased, and this is characterized in that ultra high color purity is achieved with a green pixel thin film. Furthermore, the PB16 and the yellow pigment are nano-dispersed and stabilized to achieve both ultra-high color purity and ultra-high contrast ratio.

  In the green colorant composition of the present invention, the content of PB16 in the pigment needs to be 5 to 40% by mass, and preferably 10 to 30% by mass. When the PB16 is less than 5% by mass, the transmittance of 580 to 700 nm in the transmission spectrum of the green pixel cannot be sufficiently cut, so that the green pixel cannot be highly purified with a thin film. On the other hand, when the content of PB16 is more than 40% by mass, the transmittance of 400 to 495 nm in the transmission spectrum of the green pixel cannot be sufficiently cut, so that the green pixel cannot be highly purified with a thin film. Furthermore, if the PB16 content in the pigment is less than 10% by mass, the green pixel may not be ultra-high-purity with a thin film. If the PB16 content in the pigment is more than 30% by mass, the green pixel may be exceeded. In some cases, a high contrast ratio cannot be achieved.

  The green colorant composition of the present invention preferably contains PG58 in addition to PB16 and a yellow pigment. However, when PG58 is used alone as a pigment, the color purity of the green pixel cannot be increased. The transmittance spectrum of the pixel with PG58 alone is particularly high at 495 to 580 nm, and the transmittance at 400 to 450 nm and 600 to 700 nm is sufficiently cut, but the transmittance at 450 to 495 nm and 580 to 600 nm is sufficient. This is because it is not cut. For this reason, since the green pixel containing PB16, a yellow pigment, and PG58 can make the transmittance | permeability of 500-580 nm especially high, since it can make ultrahigh color purity and high brightness in a thin film compatible, it is preferable. In the green colorant composition of the present invention, the content of PG58 in the pigment is preferably 0 to 40% by mass. When the content of PG58 is more than 40% by mass, in the present invention, it is essential that PB16 is 5% by mass or more, so the content of the yellow pigment is less than 45% by mass. For this reason, the transmittance | permeability of 450-495 nm cannot fully be cut, but the color purity of G may fall.

  In the green colorant composition of the present invention, PY129 and PY150 are preferably used in combination as yellow pigments. In the transmission spectrum of the pixel with PY129 alone, the transmittance of 400 to 495 nm is sufficiently cut, and the transmittance of 495 to 580 nm is relatively high. On the other hand, the transmission spectrum of the pixel with PY150 alone has a particularly high transmittance of 495 to 580 nm, although the transmittance of 400 to 495 nm is not sufficiently cut. For this reason, the synergistic effect of using PY129 and PY150 in combination as yellow pigments enables the transmittance of 495 to 580 nm to be particularly high while sufficiently cutting the transmittance of 400 to 495 nm. Easy to achieve both high brightness and high brightness. When PY129 and PY150 are used in combination as the yellow pigment, the mass mixing ratio of PY129 and PY150 in the yellow pigment is particularly preferably PY129: PY150 = 70: 30 to 30:70. When the PY129 in the yellow pigment is more than 70% by mass, the luminance of the green pixel tends to be lowered, and when the PY129 is less than 30% by mass, the color purity of the green pixel tends to be lowered.

  In the green colorant composition of the present invention, a four-pigment system of PB16, PG58, PY129, and PY150 is particularly preferable as the pigment. The content of each pigment in the case of the 4-pigment system is particularly preferably 10 to 20% by mass of PB16, particularly preferably 10 to 40% by mass of PG58, particularly preferably 20 to 35% by mass of PY129, and 20 to 20% of PY150. 35% by mass is particularly preferred. By setting the ratio of 4 pigments within the above range, the green pixel can be made of a thin film with ultrahigh color purity, ultrahigh contrast ratio, and high luminance.

  The green colorant composition of the present invention is produced by dispersing PB16 and a yellow pigment together with a solvent by a disperser to produce a green pigment dispersion, and then adding a resin and various additives to the green pigment dispersion. . That is, since the pigment is in a state of secondary particles in which primary particles are aggregated in a powder state (secondary particles are usually 1 to 50 μm), after adding a solvent, a dispersant and the like, using a disperser It is necessary to apply a shear stress to the secondary particles of the pigment and disperse them into the particles of the primary particles or the aggregate of a small number of primary particles.

  A sand mill, a ball mill, a bead mill, a three-roll mill, an attritor or the like is used as a disperser for applying a shear stress to the coarse pigment particles in a solvent. In particular, a bead mill is preferably used because of excellent dispersion efficiency. Examples of the dispersed beads include zirconia beads, alumina beads, glass beads, and the like. In order to reduce the size efficiently, it is particularly preferable to use zirconia beads. As the dispersion conditions, the shear stress can be adjusted to an appropriate level by appropriately controlling the bead diameter of the zirconia beads, the peripheral speed of the disperser, the dispersion time, etc., and the coarse particles of the pigment can be efficiently refined. be able to.

The pigment dispersion stability is preferably improved by adding a pigment sulfonated derivative dispersant and a polymer dispersant to the green pigment dispersion used in the present invention. That is,
When the dispersion stability is poor, the pigment dispersed up to the primary particles tends to increase the particle size of the pigment due to reaggregation after dispersion, and the contrast ratio of the color filter tends to decrease.

Examples of pigment sulfonated derivative dispersants include sulfonated products of metal-free phthalocyanine pigments, sulfonated products of copper phthalocyanine pigments, sulfonated products of zinc phthalocyanine pigments, and are highly resistant to concentrated sulfuric acid and fuming sulfuric acid during sulfonation. A sulfonated product of a copper phthalocyanine pigment which is difficult to decompose phthalocyanine molecules is preferable.
When using a copper phthalocyanine pigment derivative, the average number of introduced sulfonic acid groups per molecule is preferably 1.6 to 2.4. When the pigment sulfonated derivative dispersant is used, the amount added to the pigment is preferably 0.3 to 5% by mass. If it is less than 0.5% by mass, the pigment dispersion stability may be poor, and if it is more than 5% by mass, the hue may change unfavorably.

  Examples of the polymer dispersant include those having a basic group in its structure. Examples of commercially available products include “Solsperse” (Avicia), “EFKA” (Efka), “Ajisper”. (Ajinomoto Fine Techno Co., Ltd.), “BYK” (Bic Chemie Co., Ltd.) and the like can be preferably used. The use of “Solspers” 24000, “EFKA” 4300, 4330, 4340, “Ajisper” PB821, PB822, “BYK”, 2000, 2001, 6919, 21116, etc. is preferable because the dispersion stabilization effect is increased. In the present invention, the addition amount of the polymer dispersant is not particularly limited, but is preferably 10 to 50% by mass with respect to 100 parts by mass of the pigment. When the addition amount of the polymer dispersant is less than 10 parts by mass, the pigment dispersion stability may be poor, and when it is more than 50 parts by mass, the alkali developability may be poor.

  The resin used in the green colorant composition of the present invention is not particularly limited, and a resin usually used for a color filter, that is, an acrylic, epoxy, or polyamic acid resin can be preferably used. . Depending on the resin used, it can be non-photosensitive or photosensitive, and can be appropriately selected according to the color filter manufacturing process.

  In the present invention, when an acrylic resin is used for the green colorant composition, it is preferable to use a pigment sulfonated derivative dispersant and an acrylic polymer dispersant in combination as the pigment dispersant. That is, because of the synergistic effect of the pigment sulfonated derivative dispersant and the acrylic polymer dispersant, the dispersion stability of the pigment becomes extremely high, and the acrylic polymer dispersant has good compatibility with the acrylic resin. It is.

  Hereinafter, the case where acrylic resin is used as a typical example of resin used for the photosensitive green colorant composition will be described.

The acrylic resin generally contains at least an acrylic polymer, a polyfunctional monomer or oligomer, and a photopolymerization initiator in order to provide photosensitivity.
The acrylic polymer that can be used is not particularly limited, but a copolymer of an unsaturated carboxylic acid and an ethylenically unsaturated compound can be preferably used. Examples of the unsaturated carboxylic acid include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic acid, fumaric acid, vinyl acetic acid, and acid anhydrides.

  These may be used alone or in combination with other copolymerizable ethylenically unsaturated compounds. Specific examples of the copolymerizable ethylenically unsaturated compound include methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, n-propyl acrylate, isopropyl acrylate, n-propyl methacrylate, and methacrylic acid. Isopropyl, n-butyl acrylate, n-butyl methacrylate, sec-butyl acrylate, sec-butyl methacrylate, iso-butyl acrylate, iso-butyl methacrylate, tert-butyl acrylate, tert-butyl methacrylate, N-pentyl acrylate, n-pentyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, benzyl acrylate, benzyl methacrylate, and other unsaturated carboxylic acid alkyl esters, styrene, p-methyls Rene, aromatic vinyl compounds such as o-methylstyrene, m-methylstyrene and α-methylstyrene, unsaturated carboxylic acid aminoalkyl esters such as aminoethyl acrylate, unsaturated carboxylic acid glycidyl esters such as glycidyl acrylate and glycidyl methacrylate, Carboxylic acid vinyl esters such as vinyl acetate and vinyl propionate, vinyl cyanide compounds such as acrylonitrile, methacrylonitrile, and α-chloroacrylonitrile, aliphatic conjugated dienes such as 1,3-butadiene and isoprene, acryloyl groups at the terminals, Alternatively, macromonomers such as polystyrene, polymethyl acrylate, polymethyl methacrylate, polybutyl acrylate, polybutyl methacrylate, and polysilicone having a methacryloyl group And the like, but is not limited to these.

  Examples of polyfunctional monomers that can be used include bisphenol A diglycidyl ether (meth) acrylate, poly (meth) acrylate carbamate, modified bisphenol A epoxy (meth) acrylate, adipic acid 1,6-hexanediol (meth) acrylic acid ester , Phthalic anhydride propylene oxide (meth) acrylic acid ester, trimellitic acid diethylene glycol (meth) acrylic acid ester, rosin modified epoxy di (meth) acrylate, alkyd modified (meth) acrylate, tripropylene glycol di (meth) acrylate, 1, 6-hexanediol di (meth) acrylate, bisphenol A diglycidyl ether di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaeryth Torutori (meth) acrylate, triacrylformal, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, dipentaerythritol penta (meth) acrylate. These can be used alone or in combination. A mixture of two or more of these or a mixture with other compounds is used.

  There are no particular limitations on the photopolymerization initiator, and known ones can be used, such as benzophenone, N, N′-tetraethyl-4,4′-diaminobenzophenone, 4-methoxy-4′-dimethylaminobenzophenone, 2 , 2-diethoxyacetophenone, benzoin, benzoin methyl ether, benzoin isobutyl ether, benzyldimethyl ketal, α-hydroxyisobutylphenone, thioxanthone, 2-chlorothioxanthone, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- [4- (Methylthio) phenyl] -2-morpholino-1-propane, t-butylanthraquinone, 1-chloroanthraquinone, 2,3-dichloroanthraquinone, 3-chloro-2-methylanthraquinone, 2-ethylanthraquinone, 1, 4-naphthoquinone, 9,10-phenanthraquinone, 1,2-benzoanthraquinone, 1,4-dimethylanthraquinone, 2-phenylanthraquinone, 2- (o-chlorophenyl) -4,5-diphenylimidazole dimer, etc. Can be given.

  The solvent used in the green colorant composition of the present invention is not particularly limited. For example, methyl cellosolve, ethyl cellosolve, methyl carbitol, ethyl carbitol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monomethyl Ether, propylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol ethyl methyl ether, (poly) alkylene glycol ether solvents such as diethylene glycol butyl ethyl ether, or propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, ethyl acetoacetate , Methyl-3-methoxypropionate, ethyl-3-ethoxypro Fatty esters such as onate, methoxybutyl acetate, 3-methyl-3-methoxybutyl acetate, or aliphatic alcohols such as ethanol, butanol, isopropanol, 3-methyl-3-methoxybutanol, cyclopentanone, cyclohexanone Such ketones can be used, and these can be used alone or in combination of two or more. Mixing with other solvents is also preferably used.

  A surfactant, an adhesion improver, a curing accelerator, and the like can also be added to the green colorant composition of the present invention.

  The mass mixing ratio of the pigment component and the resin component in the green colorant composition of the present invention is usually 10:90 to 60:40, preferably 20:80 to 50:50. If the amount of the pigment component is less than 10% by mass, the color purity of the color filter tends to be lowered, and if the amount of the pigment component is more than 60% by mass, the reliability of the color filter tends to be lowered. In the present invention, when an acrylic resin is used as the resin, an acrylic polymer, an acrylic monomer, and a polymer dispersant are used as a resin component, and a pigment and a pigment derivative dispersant are used as a pigment component.

  In the green colorant composition of the present invention, the solid content concentration of the pigment and the resin is preferably in the range of 5 to 20% by mass from the viewpoints of coating property and drying property.

  Next, a color filter substrate using the green colorant composition of the present invention will be described. The color filter substrate of the present invention contains PB16 and a yellow pigment as pigments, and a green pixel using a green colorant composition characterized in that the content of PB16 in the pigment is 5 to 40% by mass. Needs to be formed.

  Furthermore, the color filter substrate of the present invention forms a green pixel using a green colorant composition containing PB16 / PG58 / PY129 / PY150, and red pixels using a red colorant composition containing PR177 and PR254. It is particularly preferred to form and form a blue pixel using a blue colorant composition containing PB15: 6 and PV23. As a result, the color filter can have an ultra-high contrast ratio of 5000 or more, the color reproduction range can be extremely widened to 100% or more of the NTSC ratio in combination with the LED light source, and the white balance can be improved.

  The method for producing the color filter substrate of the present invention will be described below. First, as a method of applying the green colorant composition on the substrate, a spin coater, a bar coater, a blade coater, a roll coater, a die coater, an inkjet printing method, a screen printing method, etc., a method of coating the substrate, a solution of the substrate Various methods such as a method of immersing in a solution and spraying a solution onto a substrate can be used. As the substrate, a transparent substrate such as soda glass, alkali-free glass, borosilicate glass, or quartz glass is usually used. After coating the green colorant composition on the transparent substrate by the method as described above, a coating film of the green colorant composition is formed by air drying, heat drying, vacuum drying or the like.

  Next, when the green colorant composition is photosensitive, a mask is placed on the coating film of the photosensitive colorant composition, and an ultrahigh pressure mercury lamp, a chemical lamp, a high pressure mercury lamp, or the like is used to selectively select the ultraviolet color. Perform exposure.

  Thereafter, development is performed with an alkaline developer. Examples of the alkaline substance used in the alkaline developer include inorganic alkalis such as sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium silicate, sodium metasilicate, and aqueous ammonia, ethylamine, n-propylamine, and the like. Examples include secondary amines such as tertiary amines, diethylamine and di-n-propylamine, tertiary amines such as triethylamine and methyldiethylamine, and organic alkalis such as tetramethylammonium hydroxide.

  Thereafter, the obtained coating film pattern is heat-treated to form a color filter in which pixels are patterned. The heat treatment is usually carried out in air, in a nitrogen atmosphere, or in a vacuum at a temperature of 150 to 350 ° C., preferably 180 to 250 ° C., for 0.5 to 5 hours, continuously or stepwise. Done. By this heating step, curing of the resin component in the green colorant composition proceeds.

  When the patterning process as described above is sequentially performed for each of the red, green, and blue pixels, a color filter for a liquid crystal display device can be manufactured. The patterning order of each color is not limited.

  The film thickness of the green pixel of the color filter of the present invention is usually 1.0 to 2.5 μm, preferably 1.2 to 2.3 μm. If the film thickness is thinner than 1.0 μm, light absorption is reduced and the color purity of the color filter tends to be lowered. On the other hand, when the film thickness is larger than 2.5 μm, various problems such as a decrease in flatness of the color filter, a decrease in pattern workability, and a decrease in reliability are likely to occur.

  The color purity of the green pixel of the color filter of the present invention can be evaluated from the relationship between y and the film thickness of chromaticity coordinates (x, y) in an XYZ display system using, for example, a C light source known as a standard condition. it can. The green pixel of the color filter usually has a higher color purity as the pixel film thickness increases, but the upper limit of the practical pixel film thickness is 2.5 μm as described above. There is a demand for color purity. In the case of a green pixel, the color purity can be evaluated from a film thickness with a constant y or a film thickness with a constant film thickness. The smaller the film thickness with a constant y, the more the y with a constant film thickness. The larger is, the green pixel is a thin film and the higher the color purity.

  In addition, the LED light source used for the liquid crystal display has a tendency that the green pixel has higher color purity than the C light source. If y = 0.670 for the C light source, y = 0.690 to 0 for the LED light source. .710 colors are obtained, and the NTSC standard green chromaticity can be reached.

  In the green pixel of the color filter of the present invention, the film thickness at chromaticity coordinates (x, y) at C light source at y = 0.670 is preferably 2.5 μm or less, and more preferably 2.3 μm or less. . If the film thickness at y = 0.670 is 2.3 μm or less, the green pixel can be ultra-high-purity with a thin film, and the color reproduction range of the color filter can be 100% or more of the NTSC ratio.

  The (x, y) of the green pixel of the color filter of the present invention is preferably close to the NTSC standard (0.210, 0.710) when combined with an LED light source, and x = 0.200 to 0.220. It is preferable that y = 0.700 to 0.720. In a green pixel, y represents color purity, and if C is a light source and y is 0.660 to 0.680, it is preferable because y is 0.700 to 0.720 for an LED light source. On the other hand, in the green pixel, x represents a hue, and as x is smaller, the color becomes bluish green, and as x is larger, the color becomes yellowish green, and x varies greatly depending on the hue of the light source used. Therefore, in the C light source, x = 0.160 to 0.260 is preferable because x = 0.200 to 0.220 when combined with various LED light sources having different hues.

  In the present invention, PB16 and a yellow pigment are contained in the green colorant composition, and high color purity can be achieved by setting the content of PB16 in the pigment to 5 to 40% by mass, and more preferably, By setting the content of PB16 in the pigment to 10 to 40% by mass, the film thickness at the C light source, y = 0.670 can be made 2.3 μm or less.

  In the color filter of the present invention, the contrast ratio at y = 0.670 of the chromaticity coordinates (x, y) is usually 2500 or more, preferably 5000 or more, and more preferably 8000 or more. The larger the contrast ratio of the color filter, the better the display quality of the liquid crystal display. In the present invention, the contrast ratio of the color filter can be 2500 or more by improving the dispersion stability of PB16 and the yellow pigment.

  The luminance of the color filter of the present invention can be evaluated using, for example, the luminance (Y) in the C light source XYZ display system. In general, in the case of a green pixel, the higher the y, the higher the color purity and the smaller Y, and the larger x, the yellowish hue and the larger Y. Therefore, the luminance should be evaluated at a constant chromaticity coordinate (x, y). is necessary. In the color filter of the present invention, Y in chromaticity coordinates (x, y) = (0.170, 0.670) is preferably 19 or more, more preferably 20 or more, and further preferably 21 or more. It is. In the present invention, Y in the chromaticity coordinates (x, y) = (0.170, 0.670) can be set to 21 or more by using four pigments of PB16 / PG58 / PY129 / PY150 as the pigment.

  The white balance of the color filter of the present invention can be evaluated by the chromaticity coordinates (x, y) of white in the XYZ color system chromaticity diagram. The chromaticity coordinates (x, y) of white of the color filter of the present invention are preferably x = 0.290 to 0.315 and y = 0.290 to 0.315. It is preferable to adjust the white balance by matching the backlight with the color filter. For example, the white balance can be adjusted by adjusting the pigment ratio of the red, green, and blue pixels of the color filter.

  Next, an example of a liquid crystal display device manufactured using this color filter will be described. The color filter substrate and the array substrate are bonded to each other through a liquid crystal alignment film that has been subjected to a rubbing process for liquid crystal alignment provided on the substrate and a spacer for maintaining a cell gap. Note that a thin film transistor (TFT) element, a thin film diode (TFD) element, a scanning line, a signal line, and the like are provided over the array substrate, whereby a TFT liquid crystal display device and a TFD liquid crystal display device can be manufactured. Next, after injecting liquid crystal from the injection port provided in the seal portion, the injection port is sealed. A liquid crystal display device is completed by attaching a backlight and mounting an IC driver or the like. As the backlight, a two-wavelength LED, a three-wavelength LED, a CCFL, or the like can be used. In particular, the three-wavelength LED is preferable because the color reproduction range of the liquid crystal display device can be widened and the power consumption can be reduced.

Hereinafter, the present invention will be described in more detail using preferred embodiments.
The green colorant composition and the color filter in the examples were evaluated by the following methods.

<Evaluation method>
(Green pixel chromaticity)
The chromaticity coordinates (x, y) in the C light source XYZ color system of the pixel were measured using a microspectrophotometer “MCPD-2000” manufactured by Otsuka Electronics Co., Ltd.
(Green pixel film thickness)
The film thickness of the pixel was measured using a surface step meter “Surfcom 1400D” manufactured by Tokyo Seimitsu Co., Ltd.
(Color purity of green pixel)
The color purity of the green pixel was evaluated from the relationship between y and the film thickness of chromaticity coordinates (x, y) in the C light source XYZ display system. The green pixel of the color filter usually has a higher color purity as the pixel film thickness increases. However, the practical upper limit of the film thickness of the color filter is 2.5 μm. The color purity of was determined.
(1) When y at a film thickness of 2.5 μm is smaller than 0.640: Low color purity (2) When y at a film thickness of 2.5 μm is 0.640 or more and smaller than 0.670: High color purity ( 3) When the film thickness at y = 0.670 is 2.5 μm or less: Ultra high color purity (4) When the film thickness at y = 0.670 is 2.3 μm or less: Ultra-high color purity with a thin film.
(Green pixel brightness)
The luminance Y of the pixel was measured using a microspectrophotometer “MCPD-2000” manufactured by Otsuka Electronics Co., Ltd. It was determined that the higher the Y in (x, y) = (0.170, 0.670), the higher the luminance.
(Contrast ratio of green pixel)
A pixel formed by applying a colorant composition onto a glass substrate is prepared, placed between the polarizer and the analyzer so that the film surface falls within the entire measurement area, and when the polarizer and the analyzer are parallel to each other. The contrast ratio was calculated by measuring the light transmittance (I1) and the ratio (I1 / I2) of the light transmittance (I2) when the polarizer and the analyzer were orthogonal. A polarizing film “NPF-G1220DUN” manufactured by Nitto Denko Corporation was used for the polarizer and the analyzer. “FL8A-EX / 70” manufactured by Meidaku System, which is a backlight unit using a hot cathode tube as a light source, was used, and “BM-5A” manufactured by Topcon Corporation was used as a color luminance meter. The contrast ratio was determined according to the following criteria.
(1) When the contrast ratio is less than 2500: Low contrast ratio (2) When the contrast ratio is 2500 or more and less than 5000: High contrast ratio (3) When the contrast ratio is 5000 or more: Ultra high contrast ratio
(Color filter color reproduction range)
Using a microspectrophotometer “MCPD-2000” manufactured by Otsuka Electronics Co., Ltd., transmission spectra of wavelengths of 400 to 700 nm of red, green, and blue pixels of the color filter were measured. XYZ of the red pixel, green pixel, and blue pixel is obtained from the measured transmittance spectrum of each pixel and the spectrum of the three-wavelength LED backlight light source (blue light emission, red phosphor, green phosphor), and the red pixel, green pixel, blue Pixel chromaticity coordinates (x, y) were calculated. The color reproduction range of the color filter was calculated by comparing the area of the triangle formed by connecting the chromaticity coordinates with the NTSC standard area.

The green pixel (x, y) was determined to be good when x = 0.160 to 0.260 and y = 0.660 to 0.680 when the C light source was used. Further, when a three-wavelength LED light source was used, it was determined that x = 0.200 to 0.220 and y = 0.700 to 0.720.
(White balance of color filter)
In the same manner as described above, XYZ of red, green, and blue pixels was obtained, and XYZ of white and chromaticity coordinates (x, y) of white were calculated. When the white chromaticity coordinates were x = 0.290 to 0.315 and y = 0.290 to 0.315, it was determined that the white balance was good.

Example 1
(Preparation of green colorant composition)
As pigments, 20 g of PB16 ("Heliogen Blue" manufactured by BASF, (trade name) D7490), 30 g of PY129 ("Irgazine Yellow" manufactured by Ciba Specialty Chemicals, (trade name) 5GLT), 50 g of PY150 (Product made by LANXESS, (trade name) E4GNGT) was mixed. In this pigment, 0.5 g of copper phthalocyanine pigment sulfonated dispersant (average number of introduced sulfonic acid groups per molecule of 1.9), 99.5 g of polymer dispersant (produced by Big Me Japan Co., Ltd.) (Trade name) BYK2000, 40% by mass solution), 67 g acrylic resin (manufactured by Daicel Chemical, “Cyclomer”, (trade name) CA250, 45% by mass solution), 83 g propylene glycol monomethyl ether, and 650 g propylene glycol Monomethyl ether acetate was mixed to prepare a slurry. The beaker containing the slurry was connected with a circulation type bead mill disperser ("Dynomill" KDL-A manufactured by Willie et Bacofen) and a tube, and zirconia beads having a diameter of 0.3 mm were used as a medium at 3200 rpm for 6 hours. Dispersion treatment was performed to obtain a green pigment dispersion.

74.4 g of this green pigment dispersion, 0.7 g of cyclomer ACA250 (45 mass% solution), 1.7 g of polyfunctional monomer (Nippon Kayaku, “Kayarad” DPHA), 0.2 g of photopolymerization start After adding an agent (Ciba Specialty Chemicals, “Irgacure” 907), 0.1 g of photopolymerization initiator (Nippon Kayaku, “Kayacure” DETX-S), and 22.9 g of propylene glycol monomethyl ether acetate, Further, a surfactant “BYK333” manufactured by bic chemie was added to a total solid content of 2000 ppm to obtain a photosensitive green colorant composition.
The mass mixing ratio of the pigment component and the resin component in the green colorant composition is pigment component: resin component = 50: 50, and the mass mixing ratio of the pigment is PB16: PY129: PY150 = 20/30/50. It was.
(Production of color filter substrate with green pixels)
Next, the photosensitive green colorant composition obtained on the transparent glass substrate was applied with a spinner, and then heat-treated in a hot air oven at 90 ° C. for 10 minutes to obtain a green colored film. Next, a predetermined area is exposed through a negative mask, and “Emulgen” A-60 (HLB12.8, polyoxyethylene derivative) as a nonionic surfactant is added to a 0.04% aqueous potassium hydroxide solution (manufactured by Kao Corporation). ) Was developed by immersing with an alkali developer added at 0.1% by mass with respect to the total amount of the developer for 90 seconds, followed by washing with pure water to obtain a patterned substrate. The obtained patterned substrate was held in a hot air oven at 220 ° C. for 30 minutes to cure the acrylic resin. Thus, a color filter substrate on which green pixels were formed was produced.
In addition, since the film thickness at the chromaticity y = 0.670 of the green pixel was 2.5 μm or less, the spinner rotation speed of the green colorant composition was adjusted, and coating was performed so that y = 0.670. It was.

Example 2
(Production of green colorant composition and color filter substrate)
A green colorant composition and a color filter substrate were prepared in the same manner as in Example 1 except that 30 g of PB16, 35 g of PY129, and 35 g of PY150 were used as the pigment. In addition, since the film thickness at the chromaticity y = 0.670 of the green pixel was 2.5 μm or less, the spinner rotation speed of the green colorant composition was adjusted, and coating was performed so that y = 0.670. It was.

Example 3
(Production of green colorant composition and color filter substrate)
A green colorant composition and a color filter substrate were produced in the same manner as in Example 1 except that 40 g of PB16 and 60 g of PY129 were used as the pigment. In addition, since the film thickness at the chromaticity y = 0.670 of the green pixel was 2.5 μm or less, the spinner rotation speed of the green colorant composition was adjusted, and coating was performed so that y = 0.670. It was.

Comparative Example 1
(Production of green colorant composition and color filter substrate)
A green colorant composition and a color filter substrate were prepared in the same manner as in Example 1 except that 45 g of PB16 and 55 g of PY129 were used as the pigment. In addition, since the chromaticity y = 0.670 was not reached even when the film thickness of the green pixel was increased to 2.5 μm, the spinner rotation speed of the green colorant composition was adjusted to be 2.5 μm. Application was performed.

Comparative Example 2
(Production of green colorant composition and color filter substrate)
The green colorant composition and the color were the same as in Example 1 except that 40 g of PG58 (manufactured by DIC Corporation, “First Gen Green”, (trade name) A110) and 60 g of PY129 were used as the pigment. A filter substrate was produced. In addition, since the chromaticity y = 0.670 was not reached even when the film thickness of the green pixel was increased to 2.5 μm, the spinner rotation speed of the green colorant composition was adjusted to be 2.5 μm. Application was performed.

Comparative Example 3
(Production of green colorant composition and color filter substrate)
As a pigment, 40 g of PG36 (manufactured by DIC Corporation, “First Gen Green”, (trade name) 2YK-CF), 60 g of PY138 (manufactured by BASF Corporation, “Pariol Yellow”, (trade name) D0960) A green colorant composition and a color filter substrate were prepared in the same manner as in Example 1 except that. In addition, since the chromaticity y = 0.670 was not reached even when the film thickness of the green pixel was increased to 2.5 μm, the spinner rotation speed of the green colorant composition was adjusted to be 2.5 μm. Application was performed.

Example 4
(Production of green colorant composition and color filter substrate)
A green colorant composition and a color filter substrate were prepared in the same manner as in Example 1 except that 20 g of PB16, 20 g of PG58, and 60 g of PY138 were used as the pigment. In addition, since the chromaticity y = 0.670 was not reached even when the film thickness of the green pixel was increased to 2.5 μm, the spinner rotation speed of the green colorant composition was adjusted to be 2.5 μm. Application was performed.

Example 5
(Production of green colorant composition and color filter substrate)
A green colorant composition and a color filter substrate were prepared in the same manner as in Example 1 except that 20 g of PB16, 20 g of PG58, and 60 g of PY129 were used as the pigment. In addition, since the film thickness at the chromaticity y = 0.670 of the green pixel was 2.5 μm or less, the spinner rotation speed of the green colorant composition was adjusted, and coating was performed so that y = 0.670. It was.

Example 6
(Production of green colorant composition and color filter substrate)
A green colorant composition and a color filter substrate were prepared in the same manner as in Example 1 except that 20 g of PB16, 20 g of PG58, 30 g of PY129, and 30 g of PY150 were used as the pigment. In addition, since the film thickness at the chromaticity y = 0.670 of the green pixel was 2.5 μm or less, the spinner rotation speed of the green colorant composition was adjusted, and coating was performed so that y = 0.670. It was.

Example 7
(Production of green colorant composition and color filter substrate)
A green colorant composition and a color filter substrate were prepared in the same manner as in Example 1 except that 10 g of PB16, 40 g of PG58, 25 g of PY129, and 25 g of PY150 were used as the pigment. In addition, since the film thickness at the chromaticity y = 0.670 of the green pixel was 2.5 μm or less, the spinner rotation speed of the green colorant composition was adjusted, and coating was performed so that y = 0.670. It was.

Example 8
(Production of green colorant composition and color filter substrate)
A green colorant composition and a color filter substrate were prepared in the same manner as in Example 1 except that 10 g of PB16, 30 g of PG58, 30 g of PY129, and 30 g of PY150 were used as the pigment. In addition, since the film thickness at the chromaticity y = 0.670 of the green pixel was 2.5 μm or less, the spinner rotation speed of the green colorant composition was adjusted, and coating was performed so that y = 0.670. It was.

Example 9
(Production of green colorant composition and color filter substrate)
A green colorant composition and a color filter substrate were prepared in the same manner as in Example 1 except that 10 g of PB16, 20 g of PG58, 35 g of PY129, and 35 g of PY150 were used as the pigment. In addition, since the film thickness at the chromaticity y = 0.670 of the green pixel was 2.5 μm or less, the spinner rotation speed of the green colorant composition was adjusted, and coating was performed so that y = 0.670. It was.

Example 10
(Production of green colorant composition and color filter substrate)
A green colorant composition and a color filter substrate were prepared in the same manner as in Example 1 except that 5 g of PB16, 55 g of PG58, 20 g of PY129, and 20 g of PY150 were used as the pigment. In addition, since the chromaticity y = 0.670 was not reached even when the film thickness of the green pixel was increased to 2.5 μm, the spinner rotation speed of the green colorant composition was adjusted to be 2.5 μm. Application was performed.

Example 11
(Production of green colorant composition and color filter substrate)
A green colorant composition and a color filter substrate were prepared in the same manner as in Example 1 except that 5 g of PB16, 45 g of PG58, 25 g of PY129, and 25 g of PY150 were used as the pigment. In addition, since the chromaticity y = 0.670 was not reached even when the film thickness of the green pixel was increased to 2.5 μm, the spinner rotation speed of the green colorant composition was adjusted to be 2.5 μm. Application was performed.

Example 12
(Production of green colorant composition and color filter substrate)
A green colorant composition and a color filter substrate were prepared in the same manner as in Example 1 except that 5 g of PB16, 35 g of PG58, 30 g of PY129, and 30 g of PY150 were used as the pigment. In addition, since the chromaticity y = 0.670 was not reached even when the film thickness of the green pixel was increased to 2.5 μm, the spinner rotation speed of the green colorant composition was adjusted to be 2.5 μm. Application was performed.

Comparative Example 4
(Production of green colorant composition and color filter substrate)
A green colorant composition and a color filter substrate were prepared in the same manner as in Example 1 except that 3 g of PB16, 37 g of PG58, 30 g of PY129, and 30 g of PY150 were used as the pigment. In addition, since the chromaticity y = 0.670 was not reached even when the film thickness of the green pixel was increased to 2.5 μm, the spinner rotation speed of the green colorant composition was adjusted to be 2.5 μm. Application was performed.

  Table 1 shows various evaluations of the green colorant compositions of Examples 1 to 12 and Comparative Examples 1 to 4.

  Examples 1 to 12 contained PB16 and a yellow pigment as pigments, and PB16 in the pigment was 5 to 40% by mass, so that good results were obtained with high color purity (both y was 0.640). that's all).

  On the other hand, since the comparative example 1 had 45% by mass of PB16, the result was poor with low color purity (y = 0.583). Since Comparative Example 2 and Comparative Example 3 did not contain PB16, the color purity was low (both y was smaller than 0.640). Comparative Example 4 had a low color purity because the content of PB16 was 3% by mass (y = 0.625). Furthermore, Comparative Example 1 in which PB16 was 45% by mass and Comparative Example 3 in which PY138 was used as the yellow pigment had poor results at a low contrast ratio (all were smaller than the contrast ratio 2500).

  Examples 1-12 containing PB16 and yellow pigment are the result of changing PG58 and yellow pigment. Examples 1 to 3 which do not contain PG58 could not have an ultra-contrast ratio (all contrast ratios are 2500 to 5000), whereas Examples 5 to 12 which contain PG58 are ultra-high contrast. Ratio (all have a contrast ratio of 5000 or more). Although Example 4 contained PG58, PY138 was used as a yellow pigment, so the contrast ratio was low (contrast ratio was 1300).

  Examples 4-6 are the results of changing the yellow pigment using PB16 and PG58. In Example 5 using PY129 as the yellow pigment and Example 6 using PY129 and PY150 as the yellow pigment, ultrahigh color purity and ultrahigh contrast ratio were achieved with the thin film (both y = 0.670). In Example 4 using PY138 as a yellow pigment, ultra high color purity and high contrast ratio could not be achieved (y was 0.641 at 2.5 μm, contrast ratio 1300). ).

  Compared with Example 5 using only PY129 as the yellow pigment, Example 6 using PY129 and PY150 was able to improve the luminance with the same chromaticity coordinates. Furthermore, compared with Example 2 using PB16 / PY129 / PY150, Example 6 using PB16 / PG58 / PY129 / PY150 was able to improve the luminance with the same chromaticity coordinates (Example). 2 = 19.2, Y = 20.0 in Example 5, Y = 22.3 in Example 6).

  Examples 6-12 are the results of changing the ratio of PB16 / PG58 / PY129 / PY150. In Examples 7 to 9 in which PB16 was 10% by mass, the film had a very high color purity and an ultrahigh contrast ratio of 8000 or more, which was a very good result. On the other hand, Example 6 with 20 mass% PB16 had a slightly lower contrast ratio than Examples 7-9 (contrast ratio 5600). Moreover, Examples 10-12 which made PB16 5 mass% were not able to achieve ultra high color purity (all are 2.5 micrometers in film thickness, and y is smaller than 0.670). In Examples 6 to 12, x could be adjusted in the range of 0.160 to 0.260 by changing the ratio of PB16 / PG58 / PY129 / PY150.

  1 to 4 are transmission spectra of green pixels obtained from the green colorant compositions of Example 5, Example 9, Comparative Example 1, and Comparative Example 3. FIG. In FIGS. 1 and 2, the transmittances of 400 to 495 nm and 580 to 700 nm were sufficiently cut, and the results were good. On the other hand, in FIG. 3, the transmittance cut of 400 to 495 nm was insufficient, and in FIG. 4, the transmittance cut of 580 to 700 nm was insufficient, and the result was poor.

Example 13
(Preparation of blue colorant composition)
As a pigment, 60 g of PB15: 6 (Toyo Ink "Lionol" blue, (trade name) 7602, 40 g of PV23 (Clariant Japan, "Hosta Palm" violet, (trade name) RL-COF02) were mixed. 100 g of BYK2000, 67 g of cyclomer ACA250, 83 g of propylene glycol monomethyl ether, and 650 g of propylene glycol monomethyl ether acetate were mixed in this pigment to prepare a slurry, and the beaker containing the slurry was dispersed in a circulating bead mill. Machine (Willie & Bacofen “Dynomill” KDL-A) and a tube, using 0.3 mm diameter zirconia beads as a medium, 3200 rpm, 3 hours of dispersion treatment, blue pigment dispersion Obtained.

To 44.2 g of this blue pigment dispersion is added 8.2 g cyclomer ACA250, 3.3 g DPHA, 0.2 g Irgacure 907, 0.1 g Kayacure DETX-S, and 44 g propylene glycol monomethyl ether acetate Thereafter, BYK333 was further added so that the total solid content was 2000 ppm to obtain a photosensitive blue colorant composition.
The mass mixing ratio of the pigment component and the resin component in the blue colorant composition was pigment component: resin component = 30: 70, and the mass mixing ratio of the pigment was PB15: 6: PV23 = 60: 40 ( Preparation of red colorant composition)
As a pigment, 70 g of PR177 (manufactured by Dainichi Seika, “Chromofine” red, (trade name) 6125EC), 20 g of PR254 (manufactured by Ciba Specialty Chemicals Co., Ltd., “Irgapore” red, (trade name) BK-CF ) 10 g of PY150 was mixed. 100 g of BYK2000, 67 g of cyclomer ACA250, 83 g of propylene glycol monomethyl ether and 650 g of propylene glycol monomethyl ether acetate were mixed in this pigment to prepare a slurry. The beaker containing the slurry was connected with a circulation type bead mill disperser ("Dynomill" KDL-A manufactured by Willie et Bacofen) and a tube, and zirconia beads having a diameter of 0.3 mm were used as a medium at 3200 rpm for 5 hours. Dispersion treatment was performed to obtain a red pigment dispersion.

To 66.8 g of this red pigment dispersion, 2.6 g ACA250, 2.1 g DPHA, 0.2 g Irgacure 907, 0.1 g Kayacure DETX-S, and 28.2 g propylene glycol monomethyl ether acetate are added. Thereafter, BYK333 was further added so that the total solid content was 2000 ppm to obtain a photosensitive red colorant composition.
The mass mixing ratio of the pigment component and the resin component in the red colorant composition is pigment component: resin component = 45: 55, and the mass mixing ratio of the pigment is PR177: PR254: PY150 = 70: 20: 10. It was.
(Production of color filters with green, red and blue pixels)
A green pixel was produced in the same manner as in Example 9 on the glass substrate on which the black matrix was produced, using the green colorant composition obtained in Example 9. Next, using the blue colorant composition and the red colorant composition obtained in Example 13, a blue pixel and a red pixel were produced in the same manner as the green pixel. Thereafter, a transparent electrode was formed to obtain a color filter substrate having green pixels, blue pixels, and red pixels. In addition, the spinner rotation speed of each colorant composition was adjusted so that the film thickness of each pixel after color filter curing was 2.3 μm.

Comparative Example 5
(Production of color filter substrate having green, red, and blue pixels)
A color filter substrate was produced in the same manner as in Example 13 except that a green pixel was produced using the green colorant composition obtained in Comparative Example 3.

  Table 2 shows various evaluation results of the color filter substrates obtained in Example 13 and Comparative Example 5. The chromaticity and color reproduction range are values using a three-wavelength LED light source (blue light emission, green phosphor, red phosphor).

  As shown in Table 2, in Example 13, since the green pixel was formed from the green colorant composition containing PB16 and a yellow pigment as the pigment, the green pixel has ultra-high color purity and can reach the NTSC standard. (Green chromaticity (x, y) = 0.205, 0.710).

  For this reason, the color filter of Example 13 having red pixels, green pixels, and blue pixels has a very wide color reproduction range (108% in NTSC area ratio), a sufficiently high contrast ratio (5000), and good white balance. (White chromaticity (x, y) = 0.310, 0.300).

  On the other hand, in Comparative Example 5, since the green pixel was formed from the green colorant composition not containing PB16 as the pigment, the green pixel had low color purity and did not reach the NTSC standard (green chromaticity (x, y) = 0.289, 0.629). For this reason, the color filter of Comparative Example 5 having red pixels, green pixels, and blue pixels has a color reproduction range narrower by 20% or more (85% in terms of NTSC area ratio) than the color filter of Example 13, and has a contrast ratio. The white balance was also poor.

Example 14
(Production of liquid crystal display device)
An array substrate was produced by forming TFT elements, transparent electrodes, etc. on alkali-free glass. A polyimide alignment film was formed on the color filter substrate and TFT substrate obtained in Example 13, and a rubbing treatment was performed. A sealant kneaded with microrods was printed on the array substrate, and a bead spacer having a thickness of 6 μm was sprayed thereon, and then the array substrate and the color filter substrate were bonded together. After injecting nematic liquid crystal (“Rixon” JC-5007LA manufactured by Chisso) from the injection port provided in the seal part, a polarizing film was laminated on both surfaces of the liquid crystal cell so that the polarization axes were perpendicular to obtain a liquid crystal panel. Three-wavelength LEDs (blue light emission, green phosphor, red phosphor) were attached to this liquid crystal panel, and a TAB module, a printed circuit board, etc. were mounted to produce a liquid crystal display device.

The color reproduction range of this liquid crystal display device was 108% as compared with the NTSC standard, and the color reproduction range was extremely wide. Further, when the contrast ratio was measured from the luminance ratio between white display and black display of this liquid crystal display device, the contrast ratio was 2500, and a good result was obtained. The white display was neutral and the white balance was good.
That is, since the green pixel of the color filter substrate has an ultra-high color purity and an ultra-high contrast ratio, this liquid crystal display device has a very wide color reproduction range and good display quality.

Comparative Example 6
A liquid crystal display device was produced in the same manner as in Example 14 except that the color filter substrate of Comparative Example 5 was used. The color reproduction range of this liquid crystal display device was 85% as compared with the NTSC standard, and the color reproduction range was narrow. The contrast ratio of this liquid crystal display device was 800, which was poor. The white display was yellowish and the white balance was poor. That is, the color reproduction range of this liquid crystal display device is narrow, and the display quality is poor.

  The green colorant composition for a color filter and the color filter substrate of the present invention can be suitably used for a color filter used for a liquid crystal display or the like.

Claims (5)

In a green colorant composition for a color filter containing at least a resin, a solvent, and a pigment, C.I. I. Pigment blue 16 and C.I. I. Pigment green 58 and C.I. I. Pigment Yellow 129 and C. in all pigments in the composition. I. Ri content of 5 to 40% by mass of Pigment Blue 16, the C. in total pigment I. Color filters for green colorant composition content and wherein 10 to 40% by mass Rukoto Pigment Green 58. Further, C.I. I. Claim 1 Symbol mounting color filters for green colorant composition characterized by containing a pigment yellow 150. A color filter substrate in which red pixels, green pixels, and blue pixels are formed on a transparent substrate, wherein the green pixels are formed of the green colorant composition for color filters according to claim 1 or 2. Color filter substrate. The red pixel is C.I. I. Pigment red 177 and C.I. I. Formed from a red colorant composition containing CI Pigment Red 254, and the blue pixel is C.I. I. Pigment blue 15: 6 and C.I. I. The color filter substrate according to claim 3 , wherein the color filter substrate is formed of a blue colorant composition containing Pigment Violet 23. The liquid crystal display device comprising comprising a color filter substrate according to claim 3 or 4.

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