JP2022056852A - Color filter, display device, electronic paper, method of displaying white, and color adjustment member forming composition - Google Patents

Abstract

To provide a color filter and, in particular a display device, capable of displaying each color brightly and vividly and displaying bright white color with low saturation.SOLUTION: A color filter having at least red subpixels, green subpixels, or blue subpixels on a substrate is provided, the color filter having a color adjustment member having a Y value in a range of 70 to 98, inclusive, in the CIE1931 color system arranged between the subpixels.SELECTED DRAWING: None

Description

The present invention relates to a color filter, a display device, an electronic paper, a white display method, and a composition for forming a color adjustment member.

Liquid crystal display devices are used in various applications such as televisions, notebook computers, personal digital assistants, smartphones, and digital cameras, taking advantage of their characteristics such as light weight, thinness, and low power consumption. The liquid crystal display device is required to have optimum colors of 3 to 6 primary colors depending on the application, and a color filter substrate having various color performances is used.

In recent years, there are increasing opportunities for electronic paper to be used as a display device different from a liquid crystal display device. Electronic paper has the characteristics of low power consumption and is easy on the eyes, and efforts are being made toward colorization. A color ink method and a color filter method are being studied for colorization, but the color filter method is attracting attention from the viewpoint of display switching speed.

Unlike a general liquid crystal display device, electronic paper does not adjust the brightness by the backlight light, but has a display principle of using external light, so that there is a problem that the display becomes dark. In order to improve the vividness of the display, electronic paper in which a black matrix is not provided between pixels and electronic paper in which a white light-shielding member is formed between pixels have been proposed (for example, Patent Document 1 and Patent Document 2). However, with these techniques, it is not possible to achieve both the display of each vivid color and the display of low saturation and bright white in the white display.

Japanese Unexamined Patent Application Publication No. 2003-107234 Japanese Unexamined Patent Publication No. 2013-88750

When each color is displayed using an electronic paper having a color filter, the amount of external light for the display is small, and it is necessary to design each pixel color in order to perform a preferable color display. Therefore, when white display is performed, it is difficult to display preferable white, and improvement is required.

In view of such a situation, the present invention relates to a color filter and particularly a reflective type, which can display each color brightly and vividly even in a reflective display device and can display low-saturation and bright white in a white display. It is an object of the present invention to provide a display device.

The present invention is a color filter having at least one of red, green, and blue sub-pixels on a substrate, and a tint adjustment in which a Y value in the CIE 1931 color system is 70 or more and 98 or less between the sub-pixels. It is a color filter characterized by arranging members.

Further, the present invention is a display device characterized by having the color filter of the present invention.

Further, the present invention is an electronic paper characterized by having the color filter of the present invention.

Further, the present invention is a composition for forming a tint adjusting member, characterized in that the Y value in the CIE 1931 color system is 70 or more and 98 or less when a film having a film thickness of 2 μm is formed.

According to the color filter of the present invention, it is possible to display each color brightly and vividly even in a reflection type display device, and it is possible to display bright white with low saturation in white display.

FIG. 1 is a diagram showing an example of arrangement of red, green and blue sub-pixels, and a tint adjusting member. FIG. 2 is a diagram showing an example of arrangement of red, green, blue, a fourth sub-pixel, and a tint adjusting member. FIG. 3 is a diagram showing an example of arrangement of red, green, blue and yellow sub-pixels, and a tint adjusting member. FIG. 4 is a diagram showing another example of the arrangement of the red, green, blue and fourth sub-pixels, as well as the tint adjusting member. FIG. 5 is a diagram showing another example of the arrangement of the red, green, blue and yellow sub-pixels, and the tint adjusting member.

Hereinafter, the present invention will be described in detail. In the present invention, "greater than or equal to" means the same as or larger than the numerical value shown therein. Further, "less than or equal to" means the same as or smaller than the numerical value shown therein.

The color filter of the present invention has a substrate. Examples of the substrate include soda glass, non-alkali glass, borosilicate glass, quartz glass, aluminoborosilicate glass, aluminosilicate glass, alkaline aluminosilicate glass, and inorganic glass plates such as soda lime glass whose surface is silica-coated. , Organic plastic films, sheets and the like. Two or more of these may be laminated. When the display device provided with the color filter of the present invention is a reflection type display device or a display device having a light emitting element such as a silicon OLED, the substrate may be opaque.

The organic plastic film or sheet may be a self-standing film, or may be a film formed by coating on a substrate such as a glass substrate. In the case of such a coating film, the adhesion between the substrate and the film can be appropriately adjusted and peeled off by a laser or the like. Examples of the material of the organic plastic include polyester such as polypropylene, polyethylene, polystyrene and polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyimide, polyamide, polyamideimide, polyethersulfone, and polytetrafluoroethylene (PTFE). Examples include fluoropolymers, polyether ether ketones, polyphenylene ethers, polyallylates, polysulfones and the like.

When the substrate is an organic plastic film, the substrate is preferably a film having a thickness of 5 μm or more, and more preferably 10 μm or more, from the viewpoint of the strength of the substrate. On the other hand, from the viewpoint of flexibility, the substrate is preferably a film having a thickness of 100 μm or less.

The color filter of the present invention has at least one of red (R), green (G), and blue (B) subpixels on the substrate. In the present invention, the subpixel means each point of a single color constituting one pixel on the display. By having any of the sub-pixels of red, green, and blue, it is possible to display the colors corresponding to each pixel and their additive colors. Further, it is preferable to have red, green, and blue sub-pixels on the substrate because the colors inside the RGB color triangle having the three primary colors of RGB as vertices can be expressed.

Further, it is more preferable to have a yellow (Y) sub-pixel in addition to red, green and blue. By doing so, the color inside the quadrilateral consisting of the four vertices of the RYGB can be expressed, and the golden color of the brass instrument can be expressed more vividly.

Examples of the material constituting the coloring composition forming the sub-pixels include a coloring material, a coloring composition containing a binder resin such as an acrylic resin and a polyimide resin, and a radically polymerizable compound.

Examples of the coloring material contained in the coloring composition include organic pigments, inorganic pigments, dyes and the like, and two or more of these may be contained. Among these, organic pigments and dyes are preferable from the viewpoint of further improving the transmittance.

Examples of the red color material include C.I. I. Pigment Red (hereinafter, "PR") 9, PR48, PR97, PR122, PR123, PR144, PR149, PR166, PR168, PR177, PR179, PR180, PR192, PR209, PR215, PR216, PR217, PR220, PR223, PR224, PR226 , PR227, PR228, PR240, PR254, diketopyrrolopyrrole coloring material having a bromine group, and the like. From the viewpoint of the brightness characteristics of the sub-pixels, PR254, PR177, and a diketopyrrolopyrrole color material having a bromine group are preferable, and from the viewpoint of the brightness and vividness of the red display of the electronic paper, the diketopyrrolopyrrole color having a bromine group is preferable. It is preferable to use a material. Further, from the viewpoint of the brightness, vividness, and display color of the red display of the electronic paper, the proportion of the diketopyrrolopyrrole color material having a bromine group in the color materials contained in the red sub-pixels is 70% by mass or more. It is preferable to have.

Examples of the green color material include C.I. I. Pigment green (hereinafter referred to as "PG") PG1, PG2, PG4, PG7, PG8, PG10, PG13, PG14, PG15, PG17, PG18, PG19, PG26, PG36, PG38, PG39, PG45, PG48, PG50, PG51 , PG54, PG55, PG58, PG59 and the like. From the viewpoint of the luminance characteristics of the sub-pixels, PG58 and PG59 are preferable.

Examples of the yellow color material include C.I. I. Pigment Yellow (hereinafter, "PY") 12, PY13, PY17, PY20, PY24, PY83, PY86, PY93, PY95, PY109, PY110, PY117, PY125, PY129, PY137, PY138, PY139, PY147, PY148, PY150 , PY154, PY166, PY168, PY185 and the like. From the viewpoint of color purity, transmittance and contrast ratio, PY129, PY138, PY139 and PY150 are preferable, PY138 and PY150 are more preferable, and PY150 is further preferable.

Examples of the orange color material include C.I. I. Pigment orange (hereinafter, “PO”) 13, PO31, PO36, PO38, PO40, PO42, PO43, PO51, PO55, PO59, PO61, PO64, PO65, PO71 and the like.

Examples of the blue color material include C.I. I. Pigment blue (hereinafter, “PB”) 15, PB15: 3, PB15: 4, PB15: 6, PB21, PB22, PB60, PB64 and the like.

Examples of the purple color material include C.I. I. Pigment Violet (hereinafter “PV”) 19, PV23, PV29, PV30, PV32, PV37, PV40, PV50 and the like (all of the above numbers are Color Index Nos.).

The coloring material may be a dye, and examples of the dye include oil-soluble dyes, acid dyes, direct dyes, basic dyes, and acid medium dyes. Further, the dye may be raked or used as a salt-forming compound of the dye and a nitrogen-containing compound.

Examples of red, green, blue, purple or yellow dyes include direct dyes, acid dyes, basic dyes and the like. Specific examples of these dyes include azo dyes, benzoquinone dyes, naphthoquinone dyes, anthraquinone dyes, xanthene dyes, cyanine dyes, squarylium dyes, croconium dyes, merocyanine dyes, and stillben dyes. Examples thereof include diarylmethane dyes, triarylmethane dyes, fluorane dyes, spiropyran dyes, phthalocyanine dyes, indigo dyes, flugide dyes, nickel complex dyes, and azulene dyes. The dye may be dissolved in the coloring composition or dispersed as particles.

The coloring composition may contain a radically polymerizable compound. Examples of the radically polymerizable compound contained in the coloring composition include dipentaerythritol penta (meth) acrylate, tetratrimethylol propantri (meth) acrylate, pentaerythritol tri (meth) acrylate, and pentaerythritol tetra (meth) acrylate. Ethylene oxide or propylene oxide modified products such as penta (meth) acryloyloxydipentaerythritol monosuccinate, dipentaerythritol hexa (meth) acrylate, styrene derivatives, polyfunctional maleimide compounds, poly (meth) acrylate carbamate, adipine. 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 epoxydi (meth) acrylate, alkyd-modified (meth) Oligomers such as acrylates, bifunctional (meth) acrylates such as tripropylene glycol di (meth) acrylates, 1,6-hexanediol di (meth) acrylates, trimethyl propanetri (meth) acrylates, triacrylic formal, bisphenoxyethanol Examples thereof include full orange acrylate, dicyclopentanedienyldiacrylate, alkyl-modified products thereof, alkyl ether-modified product and alkyl ester-modified product. Two or more of these may be contained.

The content of the radically polymerizable compound is preferably 40% by mass or more in the solid content of the coloring composition from the viewpoint of patterning property. On the other hand, from the viewpoint of suppressing uneven film thickness during film formation and suppressing pattern deformation due to flow during firing, the content of the radically polymerizable compound is preferably 90% by mass or less, preferably 70% by mass, in the solid content. The following is more preferable, and 60% by mass or less is further preferable. Further, from the viewpoint of patterning property, the content of the radically polymerizable compound having three or more (meth) acryloyl groups and a carboxyl group is preferably 50% by mass or more, and more preferably 60% by mass or more in the radically polymerizable compound. preferable.

In addition to the coloring composition, a binder resin, a dispersant, a photopolymerization initiator, a chain transfer agent, a sensitizer, an organic solvent, a polymerization inhibitor, an adhesion improver, a surfactant, an organic acid, an organic amino compound, and a curing agent. Etc. may be contained.

Examples of the binder resin contained in the coloring composition include acrylic resin, epoxy resin, polyimide resin, urethane resin, urea resin, polyvinyl alcohol resin, melamine resin, polyamide resin, polyamideimide resin, polyester resin, and polyolefin resin. Can be mentioned. Two or more of these may be contained. Acrylic resin is preferably used from the viewpoint of stability.

As the acrylic resin, a copolymer of an unsaturated carboxylic acid and an ethylenically unsaturated compound is preferable.

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 thereof. Two or more of these may be used.

Examples of the ethylenically unsaturated compound include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, and (. Se-butyl (meth) acrylate, iso-butyl (meth) acrylate, tert-butyl (meth) acrylate, n-pentyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, benzyl (meth) acrylate, etc. Aromatic vinyl compounds such as unsaturated carboxylic acid alkyl esters, styrene, p-methyl styrene, o-methyl styrene, m-methyl styrene, α-methyl styrene, unsaturated carboxylic acid amino alkyl esters such as amino ethyl acrylate, and glycidyl. Unsaturated carboxylic acid glycidyl esters such as 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, 1,3-butadiene, isoprene. Examples thereof include aliphatic conjugated dienes such as, and macromonomers such as polystyrene having a (meth) acryloyl group at the terminal, polymethylacrylate, polymethylmethacrylate, polybutylacrylate, polybutylmethacrylate, and polysilicone. Two or more of these may be used.

The acrylic resin preferably has an ethylenically unsaturated group in the side chain, and can improve the sensitivity. Examples of the ethylenically unsaturated group include a vinyl group, an allyl group, an acrylic group, a methacrylic group and the like. Examples of the acrylic resin having an ethylenically unsaturated group in the side chain include "Cyclomer" (registered trademark) P (Dycel Chemical Industry Co., Ltd.) and an alkali-soluble cardo resin.

The weight average molecular weight of the binder resin is preferably 3,000 or more, more preferably 9,000 or more, from the viewpoint of the strength of the cured film. On the other hand, from the viewpoint of the stability of the coloring composition, the weight average molecular weight of the binder resin is preferably 200,000 or less, more preferably 100,000 or less. Here, the weight average molecular weight of the binder resin refers to a standard polystyrene-equivalent value measured by gel permeation glomatography.

The content of the binder resin is preferably 10% by mass or more, more preferably 20% by mass or more, still more preferably 30% by mass or more in the solid content of the coloring composition from the viewpoint of suppressing uneven film thickness during film formation. On the other hand, from the viewpoint of patterning property, the content of the binder resin is preferably 60% by mass or less, more preferably 50% by mass or less, based on the solid content of the coloring composition.

The color material contained in the color filter of the present invention can be identified by laser Raman spectroscopy (Ar + laser (457.9 nm)), mass spectrometry using a MALDI mass spectrometer or a time-of-flight secondary ion mass spectrometer. can.

Examples of the dispersant contained in the coloring composition include polyester, polyalkylamine, polyallylamine, polyimine, polyamide, polyurethane, polyacrylate, polyimide, polyamideimide and copolymers thereof. Two or more of these may be contained. Among these polymer dispersants, those having an amine value in terms of solid content of 5 mgKOH / g or more and 200 mgKOH / g or less and an acid value of 1 mgKOH / g or more and 100 mgKOH / g or less are preferable. Among them, a polymer dispersant having a basic group is preferable, and the storage stability of the pigment dispersion liquid and the coloring composition can be improved. Examples of commercially available polymer dispersants having a basic group include "Solspers" (registered trademark) (manufactured by Abyssia), "EFKA" (registered trademark) (manufactured by EFKA), and "Azisper" (registered trademark). ) (Ajinomoto Fine-Techno Co., Ltd.), "BYK" (registered trademark) (manufactured by Big Chemie). Two or more of these may be contained. Among them, "Sols Perth" (registered trademark) 24000 (manufactured by Abyssia), "EFKA" (registered trademark) 4300, 4330 (manufactured by Fuka), 4340 (manufactured by Fuka), "Ajispar" (registered trademark) PB821, PB822 (Ajinomoto) Fine Techno Co., Ltd.), "BYK" (registered trademark) 161 to 163, 2000, 2001, 6919, 21116 (manufactured by Big Chemie) are preferable.

Examples of the photopolymerization initiator contained in the coloring composition include an oxime ester compound, a benzophenone compound, an acetophenone compound, an oxantone compound, an anthraquinone compound, an imidazole compound, a benzothiazole compound, and a benzoxazole compound. Examples thereof include carbazole-based compounds, triazine-based compounds, phosphorus-based compounds, and titanosen-based compounds.

More specifically, examples of the oxime ester compound include 1,2-octanedione, 1- [4- (phenylthio) phenyl]-, 2- (O-benzoyloxime), etanone, 1- [9-ethyl. -6- (2-methylbenzoyl) -9H-carbazole-3-yl]-, 1- (O-acetyloxime), etanone, 1- [9-ethyl-6- (2-methyl-4-tetrahydrofuranylmethoxy) Benzoyl) -9H-carbazole-3-yl]-, 1- (O-acetyloxime), etanone, 1- [9-ethyl-6- {2-methyl-4- (2,2-dimethyl-1,3) -Dioxolanyl) methoxybenzoyl} -9H-carbazole-3-yl]-, 1- (O-acetyloxime), 1,2-octanedione, 1- [4- (phenylthio) -2- (O-benzoyloxime) ], "Adeca Arcurus" (registered trademark) N-1919, NCI-930 (manufactured by ADEKA Co., Ltd.), "IRGACURE" (registered trademark) OXE01, OXE02 (manufactured by BASF Co., Ltd.) and the like. Examples of the benzophenone compound include benzophenone, N, N'-tetraethyl-4,4'-diaminobenzophenone, 4-methoxy-4'-dimethylaminobenzophenone and the like. Examples of the acetophenone compound include 2,2-diethoxyacetophenone, benzoin, benzoin methyl ether, benzoin isobutyl ether, benzyl dimethyl ketal, α-hydroxyisobutylphenone, 1-hydroxycyclohexylphenyl ketone, 2-methyl-1- [. 4- (Methylthio) Phenyl] -2-morpholino-1-propane, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone, 2- (dimethylamino) -2-[(4-) Methylphenyl) Methyl] -1- [4- (4-morpholinyl) phenyl] -1-butanone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropane-1-one, "IRGACURE" "(Registered trademark) 369, 379, 907 (manufactured by BASF Co., Ltd.) and the like. Examples of anthraquinone compounds include t-butyl anthraquinone, 1-chloroanthraquinone, 2,3-dichloroanthraquinone, 3-chlor-2-methylanthraquinone, 2-ethylanthraquinone, 1,4-naphthoquinone, and 9,10-fe. Examples thereof include nantraquinone, 1,2-benzoanthraquinone, 1,4-dimethylanthraquinone and 2-phenylanthraquinone. Examples of the imidazole compound include 2- (o-chlorophenyl) -4,5-diphenylimidazole dimer and the like. Examples of the benzothiazole-based compound include 2-mercaptobenzothiazole and the like. Examples of the benzoxazole-based compound include 2-mercaptobenzoxazole. Examples of the triazine-based compound include 4- (p-methoxyphenyl) -2,6-di- (trichloromethyl) -s-triazine. Two or more of these may be contained.

From the viewpoint of sensitivity, patterning property, and processability, the content of the photopolymerization initiator is preferably 1% by mass or more, more preferably 2% by mass or more, and 5% by mass in the solid content excluding the coloring material of the coloring composition. The above is more preferable. On the other hand, the content of the photopolymerization initiator is preferably 30% by mass or less, more preferably 20% by mass or less, based on the solid content of the coloring composition excluding the coloring material, from the viewpoints of sensitivity, patterning property, processability and heat resistance. It is preferably 15% by mass or less, more preferably 15% by mass or less.

Examples of the chain transfer agent contained in the coloring composition include thioglycolic acid, thioapple acid, thiosalicylic acid, 2-mercaptopropionic acid, 3-mercaptopropionic acid, 3-mercaptobutyric acid, and N- (2-mercaptopropionyl) glycine. , 2-Mercaptonicotinic acid, 3- [N- (2-mercaptoethyl) carbamoyl] propionic acid, 3- [N- (2-mercaptoethyl) amino] propionic acid, N- (3-mercaptopropionyl) alanine, 2 -Mercaptoethanolic acid, 3-mercaptopropanesulfonic acid, 4-mercaptobutanesulfonic acid, dodecyl (4-methylthio) phenyl ether, 2-mercaptoethanol, 3-mercapto-1,2-propanediol, 1-mercapto-2 -Propanol, 3-mercapto-2-butanol, mercaptophenol, 2-mercaptoethylamine, 2-mercaptoimidazole, 2-mercapto-3-pyridinol, 2-mercaptobenzothiazole, mercaptoacetic acid, trimethylpropanthris (3-mercaptopro) Pionate), 1,3,5-tris (3-mercaptobutyloxyethyl) -1,3,5-triazine-2,4,6 (1H, 3H, 5H) -trione), pentaerythritol tetrakis (3- Mercaptopropionate), 1,4-bis (3-mercaptobutylyloxy) butane, "Karenzu" (registered trademark) MT PE-1 (manufactured by Showa Denko Co., Ltd.), "Karenzu" (registered trademark) MT NR Mercapto compounds such as -1 (manufactured by Showa Denko Co., Ltd.), "Karenzu" (registered trademark) MT BD-1 (manufactured by Showa Denko Co., Ltd.), disulfide compounds obtained by oxidizing the mercapto compounds, iodoacetate , Iodinated alkyl compounds such as iodopropionic acid, 2-iodoethanol, 2-iodoethanesulfonic acid, 3-iodopropanesulfonic acid and the like. Two or more of these may be contained.

Examples of the sensitizer contained in the coloring composition include thioxanthone-based sensitizers, aromatic or aliphatic tertiary amines and the like. Examples of the thioxanthone-based sensitizer include thioxanthone, 2-chlorothioxanthone, 2,4-diethylthioxanthene-9-one, "KAYACURE" (registered trademark) DETX-S (manufactured by Nippon Kayaku Co., Ltd.) and the like. Can be mentioned. Two or more of these may be contained.

The coloring composition may further contain an organic solvent. Examples of the organic solvent include diethylene glycol monobutyl ether acetate, benzyl acetate, ethyl benzoate, methyl benzoate, diethyl malonate, 2-ethylhexyl acetate, 2-butoxyethyl acetate, ethylene glycol monobutyl ether acetate, diethyl oxalate, ethyl acetoacetate, and the like. Cyclohexyl acetate, 3-methoxy-butyl acetate, methyl acetoacetate, ethyl-3-ethoxypropionate, 2-ethylbutyl acetate, isopentyl propionate, propylene glycol monomethyl ether propionate, pentyl acetate, propylene glycol monomethyl ether Acetate, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monoethyl ether, diethylene glycol monomethyl ether, monoethyl ether, methyl carbitol, ethyl carbitol, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol tertiary Butyl ether, dipropylene glycol monomethyl ether, ethyl acetate, butyl acetate, isopentylbutanol acetate, 3-methyl-2-butanol, 3-methyl-3-methoxybutanol, cyclopentanone, cyclohexanone, xylene, ethylbenzene, solvent naphtha, etc. Can be mentioned. Two or more of these may be contained.

When the color filter of the present invention has a red sub-pixel, the hue of the red sub-pixel is a * in the L ^* a ^* b ^* color system chromaticity coordinates (a ^* , b ^* ) measured by a D65 light source ^. Is 70 or more and 80 or less, and b ^* is preferably 30 or more and 40 or less. By satisfying these conditions, it is possible to display the electronic paper in red with excellent saturation and brightness. Further, from the viewpoint of display brightness, L ^* in the L ^* a ^* b ^* color system chromaticity diagram obtained by measuring the red subpixel with a D65 light source is preferably 55 or more, and more preferably 60 or more.

When the color filter of the present invention has a green sub-pixel, the hue of the green sub-pixel is a * in the L ^* a ^* b ^* color system chromaticity coordinates (a ^* , b ^* ) measured by a D65 light source ^. Is preferably −80 or more and −70 or less, and b ^* is preferably 40 or more and 60 or less. By satisfying these conditions, it is possible to display the electronic paper in green with excellent saturation and brightness. Further, from the viewpoint of display brightness, L ^* in the L ^* a ^* b ^* color system chromaticity diagram obtained by measuring the green subpixel with a D65 light source is preferably 80 or more, and more preferably 85 or more.

When the color filter of the present invention has a blue sub-pixel, the hue of the blue sub-pixel is a * in the L ^* a ^* b ^* color system chromaticity coordinates (a ^* , b ^* ) measured by a D65 light source ^. Is preferably 20 or more and 30 or less, and b ^* is preferably -80 or more and -70 or less. By satisfying these conditions, it is possible to display the electronic paper in blue with excellent saturation and brightness. Further, from the viewpoint of display brightness, L ^* in the L ^* a ^* b ^* color system chromaticity diagram obtained by measuring the blue subpixel with a D65 light source is preferably 40 or more, and more preferably 45 or more.

The hue of the fourth sub-pixel is -5 or more and 7 or less for a ^* and -7 or more for b ^* in the L ^* a ^* b ^* color system chromaticity coordinates (a ^* , b ^* ) measured by the D65 light source. It is preferably 5 or less. By satisfying these conditions, the white display of the electronic paper can be brightened.

When the color filter of the present invention has a yellow sub-pixel, the hue of the yellow sub-pixel is a * in the L ^* a ^* b ^* color system chromaticity coordinates (a ^* , b ^* ) measured by a D65 light source ^. Is preferably -50 or more and -20 or less, and b ^* is preferably 80 or more and 100 or less. By satisfying these conditions, it is possible to display the electronic paper in yellow with excellent saturation and brightness. Further, from the viewpoint of display brightness, L ^* in the L ^* a ^* b ^* color system chromaticity diagram obtained by measuring the yellow sub-pixels with a D65 light source is preferably 85 or more, and more preferably 90 or more.

Regarding the arrangement of the sub-pixels in the color filter of the present invention, when the color filter has red, green, and blue sub-pixels, for example, the arrangement as shown in FIG. 1 can be mentioned, but the arrangement is not limited thereto. Further, when the color filter has red, green, blue and a fourth sub-pixel, for example, the arrangement as shown in FIGS. 2 and 4 can be mentioned, but the arrangement is not limited thereto. Further, when the color filter has red, green, blue, and yellow sub-pixels, for example, the arrangement as shown in FIGS. 3 and 5 can be mentioned, but the arrangement is not limited thereto.

The film thickness of the sub-pixel is preferably 0.5 μm or more and 3.0 μm or less. The color purity can be improved by setting the color purity to 0.5 μm or more, more preferably 1.0 μm or more, still more preferably 1.4 μm or more. On the other hand, when it is 3.0 μm or less, more preferably 2.8 μm or less, the flatness, pattern processability and reliability of the color filter can be improved.

When the color filter of the present invention has a red sub-pixel, R / M is 0 from the viewpoint of making the red display vivid when the area of one pixel is M and the colored area of the red sub-pixel is R. .16 or more is preferable, and 0.17 or more is more preferable. The area M for one pixel includes a minimum repeating unit of a group of sub-pixels such as red, green, blue, and yellow, and an area between sub-pixels in which the sub-pixels are close to each other as the closest sub-pixel. .. The area M for one pixel can be measured as the average area of 50 pixels near the center of the color filter. Further, the colored area of the sub-pixels can be measured as the average area of 50 sub-pixels of the color near the center of the color filter substrate.

When the color filter of the present invention has green sub-pixels, the G / M is preferably 0.16 or more, and G0. 17 or more is more preferable.

When the color filter of the present invention has a blue sub-pixel, the B / M is 0.16 from the viewpoint of making the blue display vivid when the area of the minimum repeating unit is M and the colored area of the blue pixel is B. The above is preferable, and 0.17 or more is more preferable.

When the color filter of the present invention has yellow sub-pixels, the Y / M is 0.16 from the viewpoint of making the yellow display vivid when the area of the minimum repeating unit is M and the colored area of the yellow pixels is Y. The above is preferable, and 0.17 or more is more preferable.

The shape of the sub-pixel may be a rectangle such as a rectangle or a square, or may be a circle or an ellipse. From the viewpoint of improving the accuracy of bonding the array substrate and the color filter, the shape of the sub-pixels is preferably square.

The color filter of the present invention has a tint adjusting member between the sub-pixels. The tint adjusting member in the present invention is a member formed between sub-pixels and having a Y value of 70 or more and 98 or less in the CIE 1931 color system. By having the tint adjusting member between the sub-pixels, it is possible to display bright white with low saturation in the white display. The white display referred to here refers to a display method when the light passing through the entire color filter is adjusted to the maximum.

In particular, if there are sub-pixels of red, green and blue, and even yellow, the saturation when displayed in white tends to be high, and it is necessary to adjust the sub-pixel size. However, the Y value in the CIE1931 color system is 70. By having the color adjustment member of 98 or less, it is possible to improve the saturation when displaying white, and it is possible to effectively display bright white with lower saturation.

The composition for forming a color adjusting member of the present invention preferably has a Y value of 70 or more and 98 or less in the CIE 1931 color system when a film having a film thickness of 2 μm is formed. By doing so, the color adjusting member in the color filter of the present invention can be efficiently formed as the composition for forming the color adjusting member.

Examples of the material constituting the composition for forming the color adjusting member for forming the color adjusting member include a coloring material, a composition containing a binder resin such as an acrylic resin and a polyimide resin, and the like.

Examples of the coloring material contained in the color adjusting member and the composition for forming the color adjusting member include organic pigments, inorganic pigments, dyes and the like, and two or more of these may be contained. Among these, organic pigments are preferable from the viewpoint of light resistance.

Examples of the red color material of the composition for forming the color tone adjusting member include C.I. I. Pigment Red (hereinafter, "PR") 9, PR48, PR97, PR122, PR123, PR144, PR149, PR166, PR168, PR177, PR179, PR180, PR192, PR209, PR215, PR216, PR217, PR220, PR223, PR224, PR226 , PR227, PR228, PR240, PR254, diketopyrrolopyrrole coloring material having a bromine group, and the like.

Examples of the green color material of the composition for forming the color tone adjusting member include C.I. I. Pigment green (hereinafter referred to as "PG") PG1, PG2, PG4, PG7, PG8, PG10, PG13, PG14, PG15, PG17, PG18, PG19, PG26, PG36, PG38, PG39, PG45, PG48, PG50, PG51 , PG54, PG55, PG58, PG59 and the like.

Examples of the yellow color material of the composition for forming the color tone adjusting member include C.I. I. Pigment Yellow (hereinafter, "PY") 12, PY13, PY17, PY20, PY24, PY83, PY86, PY93, PY95, PY109, PY110, PY117, PY125, PY129, PY137, PY138, PY139, PY147, PY148, PY150 , PY154, PY166, PY168, PY185 and the like.

Examples of the orange color material of the composition for forming the color tone adjusting member include C.I. I. Pigment orange (hereinafter, “PO”) 13, PO31, PO36, PO38, PO40, PO42, PO43, PO51, PO55, PO59, PO61, PO64, PO65, PO71 and the like.

Examples of the blue color material of the composition for forming the color tone adjusting member include C.I. I. Pigment blue (hereinafter, “PB”) 15, PB15: 3, PB15: 4, PB15: 6, PB21, PB22, PB60, PB64 and the like.

Examples of the purple color material of the composition for forming the color tone adjusting member include C.I. I. Pigment Violet (hereinafter “PV”) 19, PV23, PV29, PV30, PV32, PV37, PV40, PV50 and the like (all of the above numbers are Color Index Nos.).

The coloring material of the composition for forming a color adjusting member may be a dye, and examples of the dye include oil-soluble dyes, acid dyes, direct dyes, basic dyes, and acid medium dyes. Further, the dye may be raked or used as a salt-forming compound of the dye and a nitrogen-containing compound.

Examples of red, green, blue, purple or yellow dyes include direct dyes, acid dyes, basic dyes and the like. Specific examples of these dyes include azo dyes, benzoquinone dyes, naphthoquinone dyes, anthraquinone dyes, xanthene dyes, cyanine dyes, squarylium dyes, croconium dyes, merocyanine dyes, and stillben dyes. Examples thereof include diarylmethane dyes, triarylmethane dyes, fluorane dyes, spiropyran dyes, phthalocyanine dyes, indigo dyes, flugide dyes, nickel complex dyes, and azulene dyes. The dye may be dissolved in the coloring composition or dispersed as particles.

The color material contained in the color adjustment member or the composition for forming the color adjustment member may be any color material such as a red color material, a yellow color material, a blue color material, and a purple color material, but the saturation is displayed in white. A blue color material or a purple color material is preferable, and a purple color material is more preferable, from the viewpoint of displaying a bright white color.

Further, as the color material contained in the color adjustment member, PR254, diketopyrrolopyrrole color material having a bromine group, PR177, PY150, PY185, PG58, PG59, PB15: 3, PB15: 4, PB15: 6, PV23, etc. Can be used. Among them, PG58, PG59, PB15: 6, PV23 are preferable, and PB15: 6, PV23, and even more preferably PV23 are preferable from the viewpoint of displaying bright white with low saturation in white display.

The content of the coloring material contained in the color adjusting member or the composition for forming the color adjusting member is preferably 0.01% by mass or more in the solid content from the viewpoint of displaying bright white with low saturation in white display. , More preferably 0.05% by mass or more, still more preferably 0.1% by mass or more. Further, from the viewpoint of displaying a bright white color with low saturation in white display, the solid content is preferably 5% by mass or less, more preferably 3% by mass or less, and further preferably 1% by mass or less. The solid content referred to here refers to all the components excluding the organic solvent among the components contained in the color adjusting member and the composition for forming the color adjusting member.

The composition for forming a color adjusting member may contain a radically polymerizable compound. Examples of the radically polymerizable compound contained in the composition for forming a color adjusting member include dipentaerythritol penta (meth) acrylate, tetratrimethylol propanthry (meth) acrylate, pentaerythritol tri (meth) acrylate, and pentaerythritol tetra. Ethylene oxide modified products such as (meth) acrylate, penta (meth) acryloyloxydipentaerythritol monosuccinic acid ester, dipentaerythritol hexa (meth) acrylate, propylene oxide modified products, styrene derivatives, polyfunctional maleimide compounds, poly (meth) ) Acrylate carbamate, 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 epoxydi (meth) acrylate, Oligomers such as alkyd-modified (meth) acrylates, bifunctional (meth) acrylates such as tripropylene glycol di (meth) acrylates, 1,6-hexanediol di (meth) acrylates, trimethyl propanetri (meth) acrylates, and tri. Examples thereof include acrylic formal, bisphenoxyethanol full orange acrylate, dicyclopentanedienyldiacrylate, alkyl modified products thereof, alkyl ether modified products and alkyl ester modified products. Two or more of these may be contained.

The radically polymerizable compound contained in the composition for forming a color adjusting member contains dipentaerythritol hexa (meth) acrylate and pentaerythritol tri (meth) acrylate, and the mass (A) of dipentaerythritol hexa (meth) acrylate. The ratio A / B of the mass (B) of pentaerythritol tri (meth) acrylate and pentaerythritol tri (meth) acrylate is preferably 0.16 or more and 3 or less. By setting the content to 0.16 or more, more preferably 0.17 or more, still more preferably 0.3 or more, the patterning property is excellent and pattern peeling can be prevented from occurring even when fired at a low temperature. Further, by setting the A / B to 2.4 or less, more preferably 1.6 or less, the color mixing of the pattern can be suppressed. In particular, when the base material of the color filter is an organic plastic film or sheet made of polyethylene terephthalate (PET), it is necessary to fire at a low temperature. Therefore, the radically polymerizable compound has the above A / B. It is preferable that it is satisfactory.

The content of the radically polymerizable compound is preferably 40% by mass or more in the solid content of the composition for forming a color adjusting member from the viewpoint of patterning property. On the other hand, from the viewpoint of suppressing uneven film thickness during film formation and suppressing pattern deformation due to flow during firing, the content of the radically polymerizable compound is 90 in the solid content of the composition for forming a color adjusting member. It is preferably mass% or less, more preferably 70% by mass or less, still more preferably 60% by mass or less. Further, from the viewpoint of patterning property, the content of the radically polymerizable compound having three or more (meth) acryloyl groups and a carboxyl group is preferably 50% by mass or more, and more preferably 60% by mass or more in the radically polymerizable compound. preferable.

In addition to the composition for forming a color adjusting member, a binder resin, a dispersant, a photopolymerization initiator, a chain transfer agent, a sensitizer, an organic solvent, a polymerization inhibitor, an adhesion improver, a surfactant, an organic acid, and an organic substance. It may contain an amino compound, a curing agent, a cross-linking agent and the like.

Examples of the binder resin contained in the composition for forming a color adjusting member include acrylic resin, epoxy resin, polyimide resin, urethane resin, urea resin, polyvinyl alcohol resin, melamine resin, polyamide resin, polyamideimide resin, and polyester resin. , Polyolefin resin and the like. Two or more of these may be contained. Acrylic resin is preferable from the viewpoint of stability. Further, it is preferable that these resins have a functional group that reacts by heating. By having a functional group that reacts by heating, it can be suitably used for a color adjusting member formed by photolithography processing, a color adjusting member formed by coating with an inkjet or the like, drying and firing.

As the acrylic resin, a copolymer of an unsaturated carboxylic acid and an ethylenically unsaturated compound is preferable.

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 thereof. Two or more of these may be used.

Examples of the ethylenically unsaturated compound include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, and (. Se-butyl (meth) acrylate, iso-butyl (meth) acrylate, tert-butyl (meth) acrylate, n-pentyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, benzyl (meth) acrylate, etc. Aromatic vinyl compounds such as unsaturated carboxylic acid alkyl esters, styrene, p-methyl styrene, o-methyl styrene, m-methyl styrene, α-methyl styrene, unsaturated carboxylic acid amino alkyl esters such as amino ethyl acrylate, and glycidyl. Unsaturated carboxylic acid glycidyl esters such as 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, 1,3-butadiene, isoprene. Examples thereof include aliphatic conjugated dienes such as, and macromonomers such as polystyrene having a (meth) acryloyl group at the terminal, polymethylacrylate, polymethylmethacrylate, polybutylacrylate, polybutylmethacrylate, and polysilicone. Two or more of these may be used.

The acrylic resin preferably has an ethylenically unsaturated group in the side chain, and can improve the sensitivity. Examples of the ethylenically unsaturated group include a vinyl group, an allyl group, an acrylic group, a methacrylic group and the like. Examples of the acrylic resin having an ethylenically unsaturated group in the side chain include "Cyclomer" (registered trademark) P (Dycel Chemical Industry Co., Ltd.) and an alkali-soluble cardo resin.

The weight average molecular weight of the binder resin is preferably 3,000 or more, more preferably 9,000 or more, from the viewpoint of the strength of the cured film. On the other hand, from the viewpoint of the stability of the coloring composition, the weight average molecular weight of the binder resin is preferably 200,000 or less, more preferably 100,000 or less. Here, the weight average molecular weight of the binder resin refers to a standard polystyrene-equivalent value measured by gel permeation glomatography.

The content of the binder resin is preferably 10% by mass or more, more preferably 20% by mass or more, still more preferably 30% by mass or more in the solid content from the viewpoint of suppressing uneven film thickness during film formation. On the other hand, from the viewpoint of patterning property, the content of the binder resin is preferably 60% by mass or less, more preferably 50% by mass or less in the solid content.

The coloring material contained in the color adjustment member and the composition for forming the color adjustment member of the present invention includes laser Raman spectroscopy (Ar + laser (457.9 nm)), a MALDI mass spectrometer, or a time-of-flight type secondary ion mass. It can be identified by mass spectrometry with an analyzer.

Examples of the dispersant contained in the composition for forming a color adjusting member include polyester, polyalkylamine, polyallylamine, polyimine, polyamide, polyurethane, polyacrylate, polyimide, polyamideimide and copolymers thereof. .. Two or more of these may be contained. Among these polymer dispersants, those having an amine value in terms of solid content of 5 mgKOH / g or more and 200 mgKOH / g or less and an acid value of 1 mgKOH / g or more and 100 mgKOH / g or less are preferable. Among them, a polymer dispersant having a basic group is preferable, and the storage stability of the pigment dispersion liquid and the coloring composition can be improved. Examples of commercially available polymer dispersants having a basic group include "Solspers" (registered trademark) (manufactured by Abyssia), "EFKA" (registered trademark) (manufactured by EFKA), and "Azisper" (registered trademark). ) (Ajinomoto Fine-Techno Co., Ltd.), "BYK" (registered trademark) (manufactured by Big Chemie). Two or more of these may be contained. Among them, "Sols Perth" (registered trademark) 24000 (manufactured by Abyssia), "EFKA" (registered trademark) 4300, 4330 (manufactured by Fuka), 4340 (manufactured by Fuka), "Ajispar" (registered trademark) PB821, PB822 (Ajinomoto) Fine Techno Co., Ltd.), "BYK" (registered trademark) 161 to 163, 2000, 2001, 6919, 21116 (manufactured by Big Chemie) are preferable.

The composition for forming a color adjusting member may contain a photopolymerization initiator. Examples of the photopolymerization initiator contained in the composition for forming a color adjusting member include an oxime ester compound, a benzophenone compound, an acetophenone compound, an oxantone compound, an anthraquinone compound, an imidazole compound, and a benzothiazole compound. Examples thereof include benzoxazole-based compounds, carbazole-based compounds, triazine-based compounds, phosphorus-based compounds, and titanosen-based compounds.

More specifically, examples of the oxime ester compound include 1,2-octanedione, 1- [4- (phenylthio) phenyl]-, 2- (O-benzoyloxime), etanone, 1- [9-ethyl. -6- (2-methylbenzoyl) -9H-carbazole-3-yl]-, 1- (O-acetyloxime), etanone, 1- [9-ethyl-6- (2-methyl-4-tetrahydrofuranylmethoxy) Benzoyl) -9H-carbazole-3-yl]-, 1- (O-acetyloxime), etanone, 1- [9-ethyl-6- {2-methyl-4- (2,2-dimethyl-1,3) -Dioxolanyl) methoxybenzoyl} -9H-carbazole-3-yl]-, 1- (O-acetyloxime), 1,2-octanedione, 1- [4- (phenylthio) -2- (O-benzoyloxime) ], "Adeca Arcurus" (registered trademark) N-1919, NCI-930 (manufactured by ADEKA Co., Ltd.), "IRGACURE" (registered trademark) OXE01, OXE02 (manufactured by BASF Co., Ltd.) and the like. Examples of the benzophenone compound include benzophenone, N, N'-tetraethyl-4,4'-diaminobenzophenone, 4-methoxy-4'-dimethylaminobenzophenone and the like. Examples of the acetophenone compound include 2,2-diethoxyacetophenone, benzoin, benzoin methyl ether, benzoin isobutyl ether, benzyl dimethyl ketal, α-hydroxyisobutylphenone, 1-hydroxycyclohexylphenyl ketone, 2-methyl-1- [. 4- (Methylthio) Phenyl] -2-morpholino-1-propane, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone, 2- (dimethylamino) -2-[(4-) Methylphenyl) Methyl] -1- [4- (4-morpholinyl) phenyl] -1-butanone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropane-1-one, "IRGACURE" "(Registered trademark) 369, 379, 907 (manufactured by BASF Co., Ltd.) and the like. Examples of anthraquinone compounds include t-butyl anthraquinone, 1-chloroanthraquinone, 2,3-dichloroanthraquinone, 3-chlor-2-methylanthraquinone, 2-ethylanthraquinone, 1,4-naphthoquinone, and 9,10-fe. Examples thereof include nantraquinone, 1,2-benzoanthraquinone, 1,4-dimethylanthraquinone and 2-phenylanthraquinone. Examples of the imidazole compound include 2- (o-chlorophenyl) -4,5-diphenylimidazole dimer and the like. Examples of the benzothiazole compound include 2-mercaptobenzothiazole and the like. Examples of the benzoxazole-based compound include 2-mercaptobenzoxazole. Examples of the triazine-based compound include 4- (p-methoxyphenyl) -2,6-di- (trichloromethyl) -s-triazine. Two or more of these may be contained. Among these, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropan-1-one is preferable from the viewpoint of processability, and 2-methyl-1- [4- (methylthio) phenyl) is preferable. ] It is more preferable to use a sensitizer described later in combination with -2-morpholinopropane-1-one.

From the viewpoint of sensitivity, patterning property, and processability, the content of the photopolymerization initiator is preferably 1% by mass or more, more preferably 2% by mass or more, and 5% by mass in the solid content of the composition for forming a color adjusting member. % Or more is more preferable. On the other hand, the content of the photopolymerization initiator is preferably 30% by mass or less, preferably 20% by mass or less, based on the solid content of the composition for forming a color adjusting member from the viewpoints of sensitivity, patterning property, processability, and heat resistance. More preferably, it is more preferably 15% by mass or less.

The composition for forming a color adjusting member may contain a chain transfer agent. Examples of the chain transfer agent contained in the composition for forming a color adjusting member include thioglycolic acid, thioapple acid, thiosalicylic acid, 2-mercaptopropionic acid, 3-mercaptopropionic acid, 3-mercaptobutyric acid, and N- (2). -Mercaptpropionyl) glycine, 2-mercaptonicotinic acid, 3- [N- (2-mercaptoethyl) carbamoyl] propionic acid, 3- [N- (2-mercaptoethyl) amino] propionic acid, N- (3-mercapto) Propionyl) alanine, 2-mercaptoethanesulfonic acid, 3-mercaptopropanesulfonic acid, 4-mercaptobutanesulfonic acid, dodecyl (4-methylthio) phenyl ether, 2-mercaptoethanol, 3-mercapto-1,2-propanediol, 1-Mercapto-2-propanol, 3-Mercapto-2-butanol, mercaptophenol, 2-mercaptoethylamine, 2-mercaptoimidazole, 2-mercapto-3-pyridinol, 2-mercaptobenzothiazole, mercaptoacetic acid, trimethylpropanthris (3-Mercaptopropionate), 1,3,5-Tris (3-Mercaptobutyloxyethyl) -1,3,5-triazine-2,4,6 (1H, 3H, 5H) -trion), penta Ellisritol tetrakis (3-mercaptopropionate), 1,4-bis (3-mercaptobutyryloxy) butane, "Karenzu" (registered trademark) MT PE-1 (manufactured by Showa Denko Co., Ltd.), "Karenzu" ( A mercapto compound such as MT NR-1 (manufactured by Showa Denko Co., Ltd.), "Karenzu" (registered trademark) MT BD-1 (manufactured by Showa Denko Co., Ltd.), etc., obtained by oxidizing the mercapto compound. Examples thereof include iodinated alkyl compounds such as disulfide compounds, iodoacetic acid, iodopropionic acid, 2-iodoethanol, 2-iodoethanesulfonic acid and 3-iodopropanesulfonic acid. Two or more of these may be contained.

The composition for forming a color adjusting member may contain a sensitizer. Examples of the sensitizer contained in the composition for forming a color adjusting member include thioxanthone-based sensitizers, aromatic or aliphatic tertiary amines and the like. Examples of the thioxanthone-based sensitizer include thioxanthone, 2-chlorothioxanthone, 2,4-diethylthioxanthene-9-one, "KAYACURE" (registered trademark) DETX-S (manufactured by Nippon Kayaku Co., Ltd.) and the like. Can be mentioned. Two or more of these may be contained.

The composition for forming a color adjusting member may contain a cross-linking agent. The cross-linking agent contained in the composition for forming a color adjusting member refers to a compound having a functional group that reacts with heat, such as an epoxy group, a methylol group, an alkoxymethyl group, an isocyanate group, and a blocked isocyanate group. Further, the epoxy group referred to here refers to a glycidyl group, an oxetanyl group, and an alicyclic epoxy group. Examples of the cross-linking agent contained in the composition for forming a color adjusting member include ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, tripropylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, and neo. Pentyl glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, glycerin diglycidyl ether, 2,2-dibromoneopentyl glycol diglycidyl ether, 1,3,5,6-tetraglycidyl-2,4-hexanediol , N, N, N', N'-tetraglycidyl-m-xylenediamine, 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane, N, N, N', N'-tetraglycidyl-4 , 4'-Diaminodiphenylmethane, N, N, -diglycidyl-benzylamine, N, N-diglycidyl-aminomethylcyclohexane, MX-with an average of 3.7 methoxymethyl groups per triazine ring on the market. 750, MW-30, MX-100LM (all manufactured by Sanwa Chemical Co., Ltd.) in which an average of 5.8 methoxymethyl groups are substituted per triazine ring, and Cymel 300, 301, 303, 350, 370, 771. , 325, 327, 703, 712, etc., methoxymethylated melamine, Cymel 235, 236, 238, 212, 253, 254, etc., methoxymethylated butoxymethylated melamine, Cymel 506, 508, etc. Carboxyl group-containing methoxymethylated isobutoxymethylated melamine such as, methoxymethylated ethoxymethylated benzoguanamine such as Cymel 1123, methoxymethylated butoxymethylated benzoguanamine such as Cymel 1123-10, butoxymethyl such as Cymel 1128. Examples thereof include, but are not limited to, benzoguanamine compound, methoxymethylated ethoxymethylated benzoguanamine containing a carboxyl group such as Cymel 1125-80 (all manufactured by Mitsui Sianamid Co., Ltd.).

The composition for forming a color adjusting member may further contain an organic solvent. Examples of the organic solvent include diethylene glycol monobutyl ether acetate, benzyl acetate, ethyl benzoate, methyl benzoate, diethyl malonate, 2-ethylhexyl acetate, 2-butoxyethyl acetate, ethylene glycol monobutyl ether acetate, diethyl oxalate, ethyl acetoacetate, and the like. Cyclohexyl acetate, 3-methoxy-butyl acetate, methyl acetoacetate, ethyl-3-ethoxypropionate, 2-ethylbutyl acetate, isopentyl propionate, propylene glycol monomethyl ether propionate, pentyl acetate, propylene glycol monomethyl ether Acetate, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monoethyl ether, diethylene glycol monomethyl ether, monoethyl ether, methyl carbitol, ethyl carbitol, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol tertiary Butyl ether, dipropylene glycol monomethyl ether, ethyl acetate, butyl acetate, isopentylbutanol acetate, 3-methyl-2-butanol, 3-methyl-3-methoxybutanol, cyclopentanone, cyclohexanone, xylene, ethylbenzene, solvent naphtha, etc. Can be mentioned. Two or more of these may be contained.

The color adjusting member may be formed by applying a color adjusting member forming composition by inkjet or the like, drying and firing, or applying a photosensitive color adjusting member forming composition by slitting or the like. It may be applied with a mask, exposed to a mask, developed, and fired after drying (photolithography). From the viewpoint of processing dimensional accuracy, the color adjusting member is preferably formed by photolithography using a composition for forming a color adjusting member having photosensitivity.

The film thickness of the color adjusting member is preferably 0.5 μm or more, more preferably 1.0 μm or more, from the viewpoint of processability. Further, from the viewpoint of flatness and processability, the film thickness of the color tone adjusting member is preferably 3.0 μm or less, more preferably 2.8 μm or less.

The transmittance of the tint adjusting member is 90% or more for the transmittance T450 at a wavelength of 450 nm and 65% or more for the transmittance T550 at a wavelength of 550 nm from the viewpoint of displaying bright and good white with low saturation in white display. % Or less, and the transmittance T700 at a wavelength of 700 nm is preferably 80% or more.

The ratio H / M of the area H of the color adjustment member to the area M of one pixel is preferably 0.05 or more from the viewpoint of displaying bright and good white with low saturation in white display. More preferably, it is 0.10 or more. Further, from the viewpoint of making the display of each color vivid, it is preferably 0.36 or less, more preferably 0.30 or less, and further preferably 0.20 or less.

It is preferable to form the color adjustment member in the center between the pixels from the viewpoint of displaying each color brightly and vividly, but while narrowing the distance between the color adjustment member and the sub-pixel of a specific color, It may be arranged so that the distance between the tint adjusting member and the sub-pixel of another color is wide. The distance between the color adjustment member and each pixel may be 0 μm, several μm to several tens of μm, or several hundred μm. From the viewpoint of displaying vivid colors, the distance between the tint adjusting member and each pixel is preferably 50 μm or less, more preferably 30 μm or less, and even more preferably 20 μm or less.

Further, the shape of the color adjustment member may be a shape that surrounds each pixel as shown in FIGS. 1, 2, 3, and 5, or may be a rectangular shape as shown in FIG. It may be circular, elliptical, star-shaped, corrugated, or the like.

In order to display a bright white color with low saturation in a white display, the tint adjusting member is used, for example, between a red sub-pixel and a green sub-pixel and between a red sub-pixel and a blue sub-pixel. It is preferable to arrange the color adjustment member between two or more combinations of the sub-pixels, and more preferably, for example, between the red sub-pixel and the green sub-pixel, the red sub-pixel and the blue sub-pixel. It is more preferable to arrange the color adjustment member between three or more combinations of the sub-pixels, such as between the green sub-pixels and the blue sub-pixels, and the color adjustment member is placed between them. It is preferable that the number of combinations of sub-pixels to be arranged is large. The combination of sub-pixels in which the color adjustment member is arranged between them is not limited to the above example.

As for the arrangement of the color adjustment member and the sub-pixels, for example, as shown in FIG. 1, square red, green, and blue sub-pixels are repeatedly arranged, and the color adjustment member is formed between these sub-pixels. It is possible to show the said aspect. The positional relationship between the red, green, and blue sub-pixels is not particularly limited to the aspect shown in FIG.

Further, for example, as shown in FIG. 2, a mode in which a square red, green, and blue sub-pixels and a fourth sub-pixel are repeatedly arranged and a color adjustment member is formed between these sub-pixels is shown. Can be done. The positional relationship between red, green, blue, and the fourth sub-pixel is not particularly limited to the aspect of FIG.

Further, for example, as shown in FIG. 3, it is possible to show an embodiment in which square red, green, blue, and yellow sub-pixels are repeatedly arranged, and a tint adjusting member is formed between these sub-pixels. The positional relationship between the red, green, blue, and yellow sub-pixels is not particularly limited to the aspect of FIG.

Further, for example, as shown in FIG. 4, square red, green, and blue sub-pixels and a fourth sub-pixel are repeatedly arranged, and a tint adjusting member is placed between these sub-pixels as one of the respective color pixels. It is possible to show an aspect formed in a shape surrounding the portion. The positional relationship between red, green, blue, and the fourth sub-pixel is not particularly limited to the aspect of FIG.

Further, for example, as shown in FIG. 5, it is possible to show an embodiment in which square red, green, blue, and yellow sub-pixels are repeatedly arranged, and a tint adjusting member is formed adjacent to these sub-pixels. The positional relationship between the red, green, blue, and yellow sub-pixels is not particularly limited to the aspect of FIG.

The width of the color tone adjusting member is preferably 5 μm or more, and more preferably 8 μm or more, from the viewpoint of processability of the color tone adjusting member, low saturation in white display, and display of bright white color. Further, from the viewpoint of displaying bright white with low saturation in white display, the width of the tint adjusting member is preferably 40 μm or less, more preferably 30 μm or less. The width of the color adjustment member referred to here refers to the length of the color adjustment member in the spacing direction of the adjacent sub-pixels.

The color filter of the present invention may further have a black matrix. The black matrix prevents deterioration of contrast and color purity due to light leakage between pixels, and may be arranged between sub-pixels, a part between sub-pixels, or a frame portion. Examples of the material constituting the black matrix include a photosensitive composition containing a binder resin such as an acrylic resin and a polyimide resin and a radically polymerizable compound, and a non-photosensitive resin composition colored in black. The film thickness of the black matrix is preferably 0.5 μm or more, more preferably 1.0 μm or more, from the viewpoint of light-shielding property. On the other hand, from the viewpoint of workability, 2.0 μm or less is preferable, and 1.5 μm or less is more preferable.

Further, the color filter of the present invention may further have an overcoat layer. The overcoat layer suppresses the transmission of impurities from the sub-pixels of the color filter and flattens the steps caused by the sub-pixels of the color filter. Examples of the material constituting the overcoat layer include an epoxy resin, an acrylic epoxy resin, an acrylic resin, a siloxane resin, a polyimide resin, and a photosensitive or non-photosensitive material commercially available as a flattening material. The film thickness of the overcoat layer is preferably 0.5 μm or more, more preferably 1.0 μm or more, from the viewpoint of processability. On the other hand, from the viewpoint of flatness of the color filter, 5.0 μm or less is preferable, and 3.0 μm or less is more preferable.

Further, the color filter of the present invention may further have a transparent electrode. Examples of the material constituting the transparent electrode include metals such as aluminum, chromium, tantalum, titanium, neodymium or molybdenum, Indium-Tin-Oxide (ITO), Indium-Zinc-Oxide (InZnO) and the like.

Further, the color filter of the present invention may further have a diffuser plate or the like.

Hereinafter, a manufacturing method will be described by taking as an example a color adjustment member made of a composition for forming a color adjustment member having photosensitivity and a color filter having sub-pixels made of a coloring composition having photosensitivity.

A composition for forming a color adjusting member or a coloring composition is applied onto a substrate, patterned by selective exposure and development using a photomask, and fired to form a color adjusting member or sub-pixels. You can get a color filter.

As a method of applying a color adjusting member forming composition or a coloring composition for forming a color adjusting member or a sub-pixel on a substrate, for example, a spin coater, a bar coater, a blade coater, a roll coater, or a die coater. , Inkjet printing method, screen printing method, method of immersing a substrate in a composition for forming a color adjusting member or a coloring composition, a method of spraying a composition for forming a color adjusting member or a coloring composition on a substrate, and the like. Be done.

Subsequently, the substrate to which the composition for forming the color adjusting member or the coloring composition is applied is dried to form the coating film for forming the color adjusting member or the coloring composition on the substrate. Examples of the drying method include air drying, heat drying, vacuum drying and the like. Two or more of these may be combined, and for example, it is preferable to perform vacuum drying and then heat drying. The temperature for heating and drying is preferably 80 to 130 ° C., and the heating and drying device is preferably a hot air oven or a hot plate. In the case of a color filter having a black matrix, it is preferable to form a coating film of the coloring composition on a substrate on which the black matrix is formed in advance.

Next, a photomask is placed on a coating film of a composition for forming a color adjusting member or a coloring composition, and exposure is selectively performed. Examples of the exposure machine include a proximity exposure machine, a mirror projection exposure machine, a lens scan exposure machine, a stepper, and the like. From the viewpoint of accuracy, a lens scan exposure machine is preferable. Examples of the light source used for exposure include ultra-high pressure mercury lamps, chemical lamps, high pressure mercury lamps and the like.

Then, the unexposed portion is removed by development with an alkaline developer to form a coating film pattern. Examples of the alkaline substance used in the alkaline developing solution include sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium silicate, sodium metasilicate, inorganic alkalis such as aqueous ammonia, ethylamine, n-propylamine and the like. Examples thereof include primary amines, secondary amines such as diethylamine and di-n-propylamine, tertiary amines such as triethylamine and methyldiethylamine, and organic alkalis such as tetramethylammonium hydroxide. Examples of the alkaline developer include 0.02 to 1% by mass of potassium hydroxide or tetramethylammonium hydroxide. Examples of the developing method include a method of immersing the coated film after exposure in an alkaline developer for 20 to 300 seconds.

Then, by heat-treating the obtained coating film pattern, a color filter in which the color tone adjusting member and the sub-pixels are patterned is obtained. The heat treatment may be performed in air, in a nitrogen atmosphere, or in vacuum. The heating temperature is preferably 150 to 350 ° C, more preferably 180 to 250 ° C. The heating time is preferably 5 minutes to 5 hours. As the heat treatment device, a hot air oven and a hot plate are preferable. The heat treatment may be performed continuously or stepwise.

As the order in which the color adjustment member and the sub-pixel are formed, the color adjustment member may be formed after the sub-pixel is formed, or the sub-pixel may be formed after the color adjustment member is formed. .. When the color filter has sub-pixels of a plurality of colors, the sub-pixels are sequentially formed by the above method. The formation order of each color is not particularly limited.

The color filter of the present invention can be a component of a display device such as a liquid crystal display, an organic EL display, and electronic paper.

That is, the display device of the present invention is characterized by having the color filter of the present invention. The display device refers to a device that displays an image by visually recognizing a part of the screen with a display element. Examples of the display element include a liquid crystal element, an organic EL element, an inorganic EL element, a display element using MEMS, a display element using quantum dots, an electronic ink, an electronic powder fluid, an electrophoresis element, and the like. Examples of the display device include a transmissive liquid crystal display, a semi-transmissive liquid crystal display, a reflective liquid crystal display, an organic EL display, an inorganic EL display, a quantum dot display, and electronic paper. Examples of the reflective display device include devices such as wearable terminals, electronic signage, digital signage, and electronic shelf labels that display with outdoor light or indoor light. In addition to the color filter and display element of the present invention, the display device may include a light source such as an external light source, various films such as a luminance improving film and a diffuser plate, and the like.

The electronic paper of the present invention is characterized by having the color filter of the present invention. As a display method of electronic paper, an electrophoresis method using an electrophoresis display layer can be mentioned. The electrophoresis display layer refers to a member having a display medium that switches between black and white display by moving white particles and black particles by an electric field. Examples of the electrophoresis display layer include those in which microcapsules containing white particles and black particles in a dispersion liquid made of a transparent dispersion medium are immobilized with a binder resin. As the transparent dispersion medium, for example, various organic compounds such as an alcohol solvent and an aliphatic hydrocarbon can be used. As the white particles, for example, a white pigment such as titanium dioxide can be used, and as the black particles, for example, a black pigment such as carbon black or titanium black can be used. As a material for forming the wall film of the microcapsules, for example, a urethane resin, a urea resin, a composite film of gum arabic / gelatin, or the like can be used. As the binder resin, a resin having good affinity for the wall film of microcapsules and having insulating properties can be used. Such an electrophoresis display layer can be formed, for example, by dispersing microcapsules in a binder resin and applying an inked product.

In addition to the color filter and the electrophoresis display layer of the present invention, the electronic paper may have an optical film, a surface protective film, a barrier layer, a touch panel layer, and the like for improving visibility and light reflection characteristics.

When the color filter of the present invention in the electronic paper of the present invention has a combination of red, green and blue sub-pixels, or a combination of red, green, blue and yellow sub-pixels, it is whiter in the white display of the electronic paper. It is preferable that the reflectance of the portion of the electronic paper corresponding to the blue sub-pixels of the electronic paper is larger than the reflectance of the portion corresponding to any of the other sub-pixels. Especially when it has red, green, blue and yellow sub-pixels, the white display tends to be yellowish, and such an embodiment is useful. The white display referred to here refers to a white display used for the background of characters when displaying characters on electronic paper. By controlling the reflectance corresponding to the color of the sub-pixel in this way, it is possible to perform white display closer to white while making the color at the time of displaying each color vivid.

The present invention will be described below with reference to examples, but the present invention is not limited to these examples. First, the evaluation methods in Examples and Comparative Examples will be described.

[Measurement / evaluation method]
(1) Color degree, Y value, and transmittance of the color tone adjusting member With respect to the color tone adjusting member obtained in the example, a microdifferential optical measuring instrument (LCF-100MA manufactured by Otsuka Denshi Co., Ltd.) was used to chromaticity xy. , CIE 1931 color system tristimulus value (Y), transmittance T450 at 450 nm, transmittance T550 at 550 nm, and transmittance T700 at 700 nm were measured.

(2) Evaluation of white display When the color filters of each example / comparative example and the array substrate are bonded together and the reflection intensity of the sub-pixel portion of each color is maximized (hereinafter referred to as white display), L ^* and saturation are separated. The measurement was performed with a colorimeter (CM2600d manufactured by Konica Minolta Co., Ltd.).

[Example 1]
(Preparation of dispersion liquid A1)
176.3 g of anhydrous tert-amyl alcohol (2.0 mol) and 114.7 g of sodium-tert-amyl alkoxide (1.1 mol) were charged in a 500 mL three-necked flask under a nitrogen atmosphere, and the internal temperature was set to 100 while stirring. The temperature was raised to ° C. and the reaction was carried out to prepare an alcoholate solution.

In another 500 mL three-necked flask, 84.9 g of diisopropyl succinate (0.4 mol) and 145.6 g of 4-bromobenzonitrile (0.8 mol) were charged, and the internal temperature was raised to 85 ° C. with stirring. To dissolve and prepare a mixed solution.

The above mixed solution was added dropwise over 3 hours while stirring at an internal temperature of the three-necked flask containing the above alcoholate solution at 100 ° C. After completion of the dropping, the mixture was heated and stirred at an internal temperature of 90 ° C. for 12 hours to obtain a suspension.

In yet another 500 mL three-necked flask, 640 g of methanol (20.0 mol), 720 g of water (40.0 mol) and 300 g of acetic acid (10.0 mol) were charged, and the mixture was stirred while cooling the internal temperature to -10 ° C. The mixture was obtained.

The above suspension was added dropwise over 3 hours while keeping the internal temperature of the three-necked flask containing the above mixture at −5 ° C. or lower and stirring at high speed. After stirring for another 7 hours after the completion of the dropping, the reaction solution was washed and filtered until the filtrate was not colored and the salt was not deposited. The collected filtrate was dried at 80 ° C. for 24 hours, and the obtained solid substance was pulverized to obtain 112 g of a diketopyrrolopyrrole pigment having a bromine group represented by the general formula (1).

100 g of the obtained diketopyrrolopyrrole pigment having a bromine group, 50 g of a polymer dispersant (“BYK-6919” manufactured by Big Chemie Japan Co., Ltd.), a binder polymer (manufactured by Daicel Co., Ltd., “Cyclomer®”) 66.7 g of P ”, ACA250, 45% by mass solution) and 450 g of PGME were mixed to prepare a slurry. A beaker containing the slurry was connected to a dynomill with a tube, and zirconia beads having a diameter of 0.5 mm were used as a medium for dispersion treatment at a peripheral speed of 14 m / s for 8 hours to obtain a diketopyrrolopyrrole pigment having a bromine group. A dispersion A1 was prepared.

(Preparation of dispersion liquid A2)
C. I. Pigment Green 58 150g, Polymer Dispersant ("BYK-6919" manufactured by Big Chemie Japan Co., Ltd.) 75g, Binder Polymer (manufactured by Daicel Co., Ltd., "Cyclomer (registered trademark) P", ACA250, 45% by mass solution ) 100 g and PGME 675 g were mixed to prepare a slurry. A beaker containing the slurry was connected to a dyno mill with a tube, and zirconia beads having a diameter of 0.5 mm were used as a medium for dispersion treatment at a peripheral speed of 14 m / s for 8 hours to prepare a dispersion liquid A2 of Pigment Green 58. ..

(Preparation of dispersion liquid A3)
C. I. Pigment Yellow 150 150g, Polymer Dispersant ("BYK-6919" manufactured by Big Chemie Japan Co., Ltd.) 75g, Binder Polymer (manufactured by Daicel Co., Ltd., "Cyclomer (registered trademark) P", ACA250, 45% by mass solution ) 100 g and PGME 675 g were mixed to prepare a slurry. A beaker containing the slurry was connected to a dyno mill with a tube, and zirconia beads having a diameter of 0.5 mm were used as a medium for dispersion treatment at a peripheral speed of 14 m / s for 8 hours to prepare a dispersion liquid A3 of Pigment Yellow 150. ..

(Preparation of dispersion liquid A4)
C. I. Pigment Blue 15: 6 150 g, Polymer Dispersant ("BYK-6919" manufactured by Big Chemie Japan Co., Ltd.) 75 g, Binder Polymer (manufactured by Daicel Co., Ltd., "Cyclomer (registered trademark) P", ACA250, 45 mass % Solution) 100 g and PGME 675 g were mixed to prepare a slurry. A beaker containing the slurry was connected to a dyno mill with a tube, and zirconia beads having a diameter of 0.5 mm were used as a medium for dispersion treatment at a peripheral speed of 14 m / s for 8 hours to obtain a dispersion liquid A4 of Pigment Blue 15: 6. Prepared.

(Preparation of dispersion liquid A5)
C. I. Pigment Violet 23 150g, Polymer Dispersant ("BYK-6919" manufactured by Big Chemie Japan Co., Ltd.) 75g, Binder Polymer (manufactured by Daicel Co., Ltd., "Cyclomer (registered trademark) P", ACA250, 45% by mass solution ) 100 g and PGME 675 g were mixed to prepare a slurry. A beaker containing the slurry was connected to a dyno mill with a tube, and zirconia beads having a diameter of 0.5 mm were used as a medium for dispersion treatment at a peripheral speed of 14 m / s for 8 hours to prepare a dispersion liquid A5 of Pigment Violet 23. ..

(Synthesis of binder resin solution B1)
Methyl methacrylate 33 g (0.3 mol), styrene 33 g (0.3 mol), methacrylic acid 34 g (0.4 mol), 2,2'-azobis (2-methylbutyronitrile) 3 g (0) in a 500 mL three-necked flask. .02 mol) and 150 g of propylene glycol monomethyl ether acetate (PGMEA) were charged, and the mixture was stirred at 90 ° C. for 2 hours, the internal temperature was raised to 100 ° C., and the mixture was further stirred for 1 hour to obtain a reaction solution. To the obtained reaction solution, 33 g (0.2 mol) of glycidyl methacrylate, 1.2 g (0.009 mol) of dimethylbenzylamine and 0.2 g (0.002 mol) of p-methoxyphenol were added, and 4 at 90 ° C. After stirring for hours, 50 g of PGMEA was added to obtain a binder resin solution B1 having a solid content concentration of 40% by mass. When the acid value of the binder resin was measured for a 0.1 mol / L potassium hydroxide / ethanol solution using an automatic potential difference measuring device AT-610 manufactured by Kyoto Electronics Manufacturing Co., Ltd., the acid value was 80.0 (mgKOH / mgKOH /). It was g). In addition, the polystyrene-equivalent weight average molecular weight measured by the GPC apparatus was 22,000.

(Preparation of composition R for coloring)
In a 50 mL plastic bottle, dispersion A1 5.42 g, dispersion A3 0.11, binder resin solution B1 3.11 g, penta (meth) acryloyloxydipentaerythritol monosuccinic acid ester (C1) 1.49 g, N- 1919 (manufactured by ADEKA Corporation) 0.12 g and 19.75 g of dipropylene glycol methyl ether acetate (hereinafter, DPMA) were added, and the mixture was stirred for 3 hours to prepare a red coloring composition R.

(Preparation of composition G for coloring)
In a 50 mL plastic bottle, dispersion liquid A2 6.40 g, dispersion liquid A3 1.03 g, binder resin solution B1 3.11 g, penta (meth) acryloyloxydipentaerythritol monosuccinic acid ester (C1) 1.05 g, N- 1919 (manufactured by ADEKA Corporation) 0.04 g and 18.35 g of DPMA were added, and the mixture was stirred for 3 hours to prepare a green coloring composition G.

(Preparation of composition B for coloring)
In a 50 mL plastic bottle, 2.09 g of dispersion A4, 1.12 g of dispersion A5, 3.24 g of binder resin solution, 0.95 g of penta (meth) acryloyloxydipentaerythritol monosuccinate (C1), N- 1919 (manufactured by ADEKA Corporation) 0.07 g and DPMA 21.36 g were added, and the mixture was stirred for 3 hours to prepare a blue coloring composition B.

(Preparation of composition Y for coloring)
In a 50 mL plastic bottle, dispersion liquid A2 2.60 g, dispersion liquid A3 4.83 g, binder resin solution B1 3.11 g, penta (meth) acryloyloxydipentaerythritol monosulphate ester (C1) 1.05 g, N- 1919 (manufactured by ADEKA Corporation) 0.04 g and 18.35 g of DPMA were added, and the mixture was stirred for 3 hours to prepare a yellow coloring composition Y.

(Preparation of Composition H1 for Forming Color Adjusting Member)
In a 50 mL plastic bottle, 0.06 g of dispersion A5, 5.82 g of binder resin solution B1, 1.42 g of dipentaerythritol hexaacrylate (D1) and 1.42 g of pentaerythritol triacrylate (D2) as radically polymerizable compounds, and light. IRGACURE907 (manufactured by BASF Co., Ltd.) (E1) 0.10 g as a polymerization initiator, 2,4-diethylthioxanthone (F1) 0.10 g as a photosensitizer, and propylene glycol monomethyl ether acetate (G1) as an organic solvent 21. 06 g was added and stirred for 3 hours to prepare a composition for forming a color adjusting member (H1).

(Formation of red sub-pixels)
The coloring composition R was applied on a glass substrate having a thickness of 0.5 mm by spin coating, and then dried by heating at 90 ° C. for 10 minutes. The obtained colored composition coating film was exposed to an i-line of 200 mJ / cm ² with an arrangement pattern as shown in FIG. 5 via a negative photomask, and then 0.3% by mass at 23 ° C. Development was carried out with an aqueous solution of tetramethylammonium hydroxide. Subsequently, heat treatment was performed at 230 ° C. for 30 minutes to form red sub-pixels. The red sub-pixel is a square with a side length of 129 μm, the length of the minimum repetition unit, that is, the distance between the centers of adjacent sub-pixels of the same color is 318 μm, and L ^* a ^* b ^* measured with a D65 light source. The colors (L ^* , a ^* , b ^* ) of each color pixel in the color system chromaticity diagram were (62.6, 70.2, 33.4).

(Formation of green sub-pixels)
The coloring composition G was applied by spin coating on the substrate on which the red sub-pixels were formed, and then dried by heating at 90 ° C. for 10 minutes. The obtained colored composition coating film was exposed to an i-line of 200 mJ / cm ² in a positional relationship with a red sub-pixel as shown in FIG. 5 via a negative photomask, and then exposed at 23 ° C. Development was carried out with a 0.3% by mass aqueous solution of tetramethylammonium hydroxide. Subsequently, heat treatment was performed at 230 ° C. for 30 minutes to form green sub-pixels. The green sub-pixel is a square with a side length of 129 μm, the length of the minimum repetition unit, that is, the distance between the centers of adjacent sub-pixels of the same color is 318 μm, and L ^* a ^* b ^* measured with a D65 light source. The color (L ^* , a ^* , b ^* ) of each color pixel in the color system chromaticity diagram was (85.8, -77.3, 50.7).

(Formation of blue sub-pixels)
The coloring composition B was applied by spin coating on the substrate on which the red and green sub-pixels were formed, and then dried by heating at 90 ° C. for 10 minutes. The obtained colored composition coating film was exposed to i-line 200 mJ / cm ² in the positional relationship with the red and green sub-pixels as shown in FIG. 5 via a negative photomask, and then 23. Development was carried out with a 0.3% by mass tetramethylammonium hydroxide aqueous solution at ° C. Subsequently, heat treatment was performed at 230 ° C. for 30 minutes to form blue sub-pixels. The blue sub-pixel is a square with a side length of 129 μm, the length of the minimum repetition unit, that is, the distance between the centers of adjacent sub-pixels of the same color is 318 μm, and L ^* a ^* b ^* measured with a D65 light source. The colors (L ^* , a ^* , b ^* ) of each color pixel in the color system chromaticity diagram were (48.6, 27.5, -71.7).

(Formation of yellow sub-pixels)
The coloring composition Y was applied by spin coating on a substrate on which red, green and blue sub-pixels were formed, and then heat-dried at 90 ° C. for 10 minutes. After the obtained colored composition coating film was exposed to the i-line 200 mJ / cm ² in the positional relationship with the red, green and blue sub-pixels as shown in FIG. 5 via a negative photomask. , A 0.3 mass% tetramethylammonium hydroxide aqueous solution at 23 ° C. was used for development. Subsequently, heat treatment was performed at 230 ° C. for 30 minutes to form yellow sub-pixels. The yellow sub-pixel is a square with a side length of 129 μm, the length of the minimum repetition unit, that is, the distance between the centers of adjacent sub-pixels of the same color is 318 μm, and L ^* a ^* b ^* measured with a D65 light source. The color (L ^* , a ^* , b ^* ) of each color pixel in the color system chromaticity diagram was (94.8, -38.6, 83.3).

(Formation of color adjustment member)
The composition for forming a color adjusting member H1 was applied by spin coating on a substrate on which red, green, blue and yellow sub-pixels were formed, and then heat-dried at 90 ° C. for 10 minutes. The i-line 200 mJ is applied to the coating film of the obtained composition for forming a color adjusting member H1 via a negative photomask in the positional relationship with the red, green, blue, and yellow sub-pixels as shown in FIG. After exposure at / cm ² , development was carried out with a 0.3 mass% tetramethylammonium hydroxide aqueous solution at 23 ° C. Subsequently, heat treatment was performed at 230 ° C. for 30 minutes to form a color tint adjusting member having a film thickness of 2.0 μm and a width of 30 μm, and a color filter having an arrangement as shown in FIG. 5 was manufactured. The ratio H / M of the area H of the taste adjusting member to the area M of one pixel was 0.342.

The chromaticity xy of the tint adjusting member is 0.308 and 0.306, respectively, the Y value in the CIE 1931 color system is 92.7, and T450, T550 and T700 are 99.1, 90.2 and 99. It was 7.

(Manufacturing of display device)
The obtained color filter and the array substrate for evaluation were bonded together to form a display device. When displayed in white, L ^* was 60.5 and the saturation was 9.2.

[Examples 2 to 4]
As the composition for forming the color tone adjusting member, H2 to H4 were adjusted according to the blending amounts shown in Table 1 instead of H1, and were adopted in Examples 2 to 4, respectively. A color filter and a display device were manufactured in the same manner as in Example 1 except for the above. The evaluation results are summarized in Table 2.

[Comparative Example 1]
A color filter and a display device were manufactured by the same procedure as in Example 1 except that the color adjustment member was not formed. In Examples 1 to 4, the chromaticity xy is 0.310 and 0.316, respectively, and the Y value in the CIE1931 color system is 100.0, and T450 and T550, respectively, in the portion corresponding to the portion where the tint adjustment member is formed. , T700 were 100.0, 100.0 and 100.0, respectively. Further, L ^* at the time of white display as a display device was 62.7, and the saturation was 13.2.

1 Red sub-pixel 2 Green sub-pixel 3 Blue sub-pixel 4 Color adjustment member 5 Pixel 6 Red sub-pixel 7 Green sub-pixel 8 Blue sub-pixel 9 Color-adjusting member 10 Pixel 11 Red sub-pixel 12 Green sub-pixel 13 Blue sub-pixel 14 Yellow sub-pixel 15 Color adjustment member 16 pixel 17 Red sub-pixel 18 Green sub-pixel 19 Blue sub-pixel 20 Color-adjusting member 21 Pixel 22 Red sub-pixel 23 Green Sub-pixel 24 Blue sub-pixel 25 Yellow sub-pixel 26 Color adjustment member 27 pixels

The color filter substrate of the present invention can be suitably used for electronic paper.

Claims (11)

A color filter having at least one of red, green, and blue sub-pixels on the substrate, and a tint adjusting member having a Y value of 70 or more and 98 or less in the CIE1931 color system is arranged between the sub-pixels. A color filter characterized by being made of. The color filter according to claim 1, which has at least red, green, and blue subpixels on the substrate. The color filter according to claim 1 or 2, wherein the color adjusting member includes a coloring material. The transmittance T450 for light having a wavelength of 450 nm is 90% or more, the transmittance T550 for light having a wavelength of 550 nm is 65% or more and 98% or less, and the transmittance T700 for light having a wavelength of 700 nm is 80% or more. The color filter according to any one of claims 1 to 3. The color filter according to any one of claims 2 to 4, further comprising a yellow sub-pixel. The color filter according to any one of claims 3 to 5, wherein the concentration of the coloring material is 0.05% or more and 5% or less. The color filter according to any one of claims 3 to 6, wherein the color material is a blue color material or a purple color material. A display device comprising the color filter according to any one of claims 1 to 7. An electronic paper having the color filter according to any one of claims 1 to 7. The method for displaying white electronic paper having the color filter and the electrophoretic display layer according to any one of claims 2 to 7, wherein the reflectance of the portion of the electrophoretic display layer corresponding to the blue sub-pixels is different. A white display method in which the reflectance is higher than the reflectance of the portion corresponding to any of the sub-pixels of the color of. A composition for forming a tint adjusting member, wherein the Y value in the CIE 1931 color system when a film having a film thickness of 2 μm is 70 or more and 98 or less.

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