JP2002372616A - Green colored composition for color filter and color filter using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a green colored composition for a color filter manufacturing the color filter realizing a color reproducing region after panel formation with 72% display performance compared with 100% display performance of a color reproducing region in an NTSC(National Television System Committee) system without thickening a green colored layer film and to provide the color filter using the same. SOLUTION: In the green colored composition used for forming the green colored layer having >=0.6 Gy of a chromaticity coordinate (Gx, Gy) in the XYZ color system measured with <=2 μm film thickness, the green colored composition contains a copper phthalocyanine pigment and an isoindolinone pigment in a transparent resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color composition for a color filter, and a color filter for a TV and a monitor using the same.

[0002]

2. Description of the Related Art With the advent of pigment-dispersed color filters and high color rendering three-wavelength tubes, color liquid crystal display devices have formed a large market for liquid crystal color televisions, car navigation systems, and notebook personal computers integrated with liquid crystal displays. Has reached. Further, in recent years, it has begun to spread as a monitor for a desktop personal computer utilizing the features of energy saving and space saving, and has attracted attention as a display device replacing a conventional CRT monitor and a display device for a large TV.

However, at present, the display performance of a CRT is higher than that of a liquid crystal display device after panelization, and the improvement in color purity of the liquid crystal display device is widely used in the television field or the multimedia display field. Is one of the keys.

In a color television, the shape, movement, and hue of a subject are reproduced on an image receiving screen through processes of (1) imaging (color camera), (2) transmission, and (3) display (image receiver). The transmission method of the image signal including the hue has been standardized, and NTSC (National Tesla) has been adopted.
revision System Committe
e) The method is a typical example, and this method is mainly used in the United States, Canada and Japan. On the other hand, in Europe, EBU (European Broadca)
A sting Union (European Broadcasting Union) system is employed.

The color gamut of a color television is determined by
It is the chromaticity of the three primary colors of the receiver (the three primary colors of the receiver), and the range of colors that can be reproduced by the receiver is inside the triangle surrounded by three chromaticity points on the chromaticity diagram. For example, the area of a triangle on a chromaticity diagram surrounded by three chromaticity points according to the standard value of the NTSC system is a color reproduction range in the NTSC system.

[0006] The following describes CIE193, which is an XYZ color system.
The standard values of the three primary colors of red (R), green (G), and blue (B) of the NTSC system in a chromaticity diagram of one standard color system are shown. Rx = 0.67, Ry = 0.33 Gx = 0.21, Gy = 0.71 Bx = 0.14, By = 0.08

The standard values of the three primary colors of red (R), green (G) and blue (B) in the EBU system are shown below. The color gamut of this system is 7 times that of the 100% color gamut of the NTSC system.
2%. Rx = 0.64, Ry = 0.33 Gx = 0.29, Gy = 0.60 Bx = 0.15, By = 0.06

[0008]

At present, it is possible to produce a liquid crystal display device having the same level of display performance as a CRT as a display performance in a state where a color filter and a backlight unit are combined. However, the display performance of a panel containing members such as a polarizing plate and liquid crystal is about 5% lower than the color reproduction range obtained by combining a color filter and a backlight unit. Nothing satisfies the purity. To improve the color purity, for example, it is theoretically possible to increase the film thickness of the conventional color filter or to increase the pigment concentration of the coloring composition. The layer has an overhang shape, which causes a defect such as disconnection of an ITO (transparent conductive film).

[0009] When the pigment concentration of the coloring composition is increased, the dispersion state of the coloring composition becomes worse, which impairs coatability and storage stability of the coloring composition. Although the color purity of the blue colored layer can be improved, the thickness of the green colored layer needs to be 3.5 μm or more, which is a problem.

The present invention has been made in view of such a problem, and the thickness of the green coloring layer is set to, for example, 2 μm.
m, that is, a color filter that can produce a color filter having a display performance of 72% compared to 100% of the NTSC color reproduction range, without increasing the film thickness. It is an object to provide a green coloring composition for use and a color filter using the same.

[0011]

According to the present invention, there is provided an XY color filter for reproducing a color by an additive color mixture of three colors of red (R), green (G) and blue (B) with a film thickness of 2 μm or less.
Gy of the chromaticity coordinates (Gx, Gy) in the Z color system is 0.
A green color composition used for forming a green color layer having 6 or more, wherein the green color composition is a green color composition containing a copper phthalocyanine pigment and an isoindolinone pigment in a transparent resin. It is a green coloring composition for use.

The present invention also relates to a green coloring composition for a color filter according to the present invention, wherein the isoindolinone pigment is contained in an amount of 10 to 40% in all the pigments. is there.

According to the present invention, there is provided a color filter for reproducing colors by an additive mixture of three colors of red (R), green (G) and blue (B) with a film thickness of 2 μm or less. A color filter, wherein a green coloring layer is formed using the composition.

[0014]

Embodiments of the present invention will be described below in detail. As the pigment in the present invention, a copper phthalocyanine pigment such as C.I. I Pigment Green
n 7, 36 and isoindolinone pigments such as C.I. I
Pigment Yellow 109, 110, 1
39,173 is desirable. These can be used as a mixture of at least two or more types.

The isoindolinone pigment used in the present invention is used in an amount of 10 to 40% of the total pigment, preferably 10 to 40%.
It is desirable to use in the range of ２５25%. When the amount of the isoindolinone pigment is less than 10%, the film thickness becomes large,
%, The G of the chromaticity coordinates (Gx, Gy) of the green colored layer
x increases and the color purity decreases.

Examples of the resin include a thermoplastic resin, a thermosetting resin, a photosensitive resin, and a monomer or an oligomer which forms a coating film similar to the resin when cured by irradiation with radiation. These resins may be used alone or in combination of two or more. Can be used. The green coloring composition for a color filter of the present invention has a dry film thickness of 2 μm or less, preferably 1 to 2 μm, on a glass substrate when the composition is cured by ultraviolet irradiation.
A solvent or the like is added in order to apply and form so as to obtain m. When the thickness is 2 μm or more, the thickness may vary among the colors, the smoothness between the colored layers may be lost, the orientation of the liquid crystal may be disturbed, and the image quality may be degraded due to the ITO disconnection.

Examples of the thermoplastic resin include butyral resin, styrene-maleic acid copolymer, chlorinated polyethylene, chlorinated polypropylene, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, and polyurethane resin. Phenolic resin, polyester resin, acrylic resin, alkyd resin, styrene resin, polyamide resin, rubber resin, cyclized rubber, celluloses, polybutadiene, and polyimide resin. Also,
Examples of the thermosetting resin include an epoxy resin, a benzoguanamine resin, a melamine resin, and a urea resin.

As the photosensitive resin, a (meth) acrylic compound, a silica (meth) acrylic compound, or a linear polymer having a reactive substituent such as a hydroxyl group, a carboxyl group, or an amino group is interposed with an isocyanate group, an aldehyde group, or an epoxy group. A resin into which a photocrosslinkable group such as cinnamate has been introduced is used. Styrene-
A linear polymer containing an acid anhydride such as a maleic anhydride copolymer or an α-olefin-maleic anhydride copolymer was half-esterified with a hydroxyl group-containing (meth) acrylic compound such as hydroxyalkyl (meth) acrylate. Polymers are also used.

The monomers and oligomers include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and cyclohexyl (meth) acrylate.
Various types such as acrylate, polyethylene glycol di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, tricyclodecanyl (meth) acrylate, melamine (meth) acrylate, epoxy (meth) acrylate Acrylic esters and methacrylic esters, (meth) acrylic acid, styrene, vinyl acetate, (meth) acrylamide, N-hydroxymethyl (meth) acrylamide, acrylonitrile, and the like can be mentioned.

Examples of photoinitiators include 4-phenoxydichloroacetophenone, 4-t-butyldichloroacetophenone, diethoxyacetophenone, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropane-1one, 1- Acetophenone photoinitiators such as hydroxycyclohexylphenyl ketone, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butan-1-one, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether Benzoin photoinitiators such as benzyldimethyl ketal, benzophenone, benzoylbenzoic acid, methyl benzozoylbenzoate, 4-phenylbenzophenone, hydroxybenzophenone, acrylated benzophenone, 4- Nzoiru 4'benzophenone photoinitiators such as methyl diphenyl sulfide, thioxanthone, 2-black Lucio hexane Son, 2-methyl thioxanthone, isopropyl thioxanthone, 2,4,6
-Trichloro-s-triazine, 2-phenyl-4,6
-Bis (trichloromethyl) -s-triazine, 2-
(P-methoxyphenyl) -4,6-bis (trichloromethyl) -s-triazine, 2- (tolyl) -4,6-
Bis (trichloromethyl) -s-triazine, 2-piphenyl-4,6-bis (trichloromethyl) -s-triazine, 2,4-bis (trichloromethyl) -6-styryl-s-triazine, 2- (4 -Methoxy-naphth-1
-Yl) -4,6-bis (trichloromethyl) -s-triazine, 2- (naphth-1-yl) -4,6-bis (trichloromethyl) -s-triazine, 2,4-trichloromethyl (piperonyl) ) -6-Triazine, 2,4
-Trichloromethyl (4'-methoxystyryl) -6
A compound of a triazine photoinitiator such as triazine, a carbazole photoinitiator, or an imidazole photoinitiator is used.

The above initiators may be used alone or as a mixture of two or more. As sensitizers, α-acyloxime ester, acylphosphine oxide, methylphenylglyoxylate, benzyl, 9,10-phenanthrenequinone are used. , Camphorquinone, ethylanthraquinone,
4,4′-diethylisophthalophenone, 3,3 ′,
4,4'-tetra (t-butylperoxycarbonyl)
Compounds such as benzophenone and 4,4'-diethylaminobenzophenone can also be used in combination.

As the solvent, cyclohexanone, ethyl cellosolve acetate, butyl cellosolve acetate,
1-methoxy-2-propyl acetate, diethylene glycol dimethyl ether, ethylbenzene, ethylene glycol diethyl ether, xylene, ethyl cellosolve, methyl-n-amyl ketone, propylene glycol monomethyl ether toluene, methyl ethyl ketone,
Ethyl acetate, methanol, ethanol, isopropyl alcohol, butanol, isobutyl ketone, petroleum solvents and the like can be mentioned, and these are used alone or in combination.

The color filter of the present invention is formed of a red coloring layer, a green coloring layer, and a blue coloring layer. Examples of the pigment used for the red coloring layer include C.I. I Pigment R
ed 254 and C.I. I Pigment Red 17
7 is used. Ε-type copper phthalocyanine (CI Pigment B) is used as a pigment for the blue colored layer.
lu: 15: 6) and a dioxazine violet pigment (CI Pigment Violet 23).

[0024]

Next, the contents of the present invention will be specifically described by way of examples. <Preparation of coloring composition> (Green coloring composition 1) Green pigment: C.I. I Pigment Green 36 6.6 parts (“Lionol Green 6YK” manufactured by Toyo Ink Mfg. Co., Ltd.) Yellow pigment: C.I. I Pigment Yellow 139 1.4 parts (“PARIOTOR YELLOW D1819” manufactured by BASF) • 7 parts of acrylic polymer • 4.3 parts of dipentaerythritol hexaacrylate • Photoinitiator (“Irgacure 907” manufactured by Ciba Geigy) 0.9 Part ・ Sensitizer (“EAB-F” manufactured by Hodogaya Chemical Co., Ltd.) 0.4 part ・ Cyclohexanone 79.4 parts (green coloring composition 2) ・ Green pigment: CI Pigment Green 36 6.6 parts (Toyo Ink Manufactured company "Lionol Green 6YK")-Yellow pigment: CI Pigment Yellow 150, 1.4 parts (Bayer "Fan Chon First Yellow Y-5688")-Acrylic polymer 7 parts-Dipentaerythritol hexagon Acrylate 4.3 parts-Photoinitiator -0.9 parts of Irgacure 907-0.4 parts of sensitizer ("EAB-F" of Hodogaya Chemical Co., Ltd.)-79.4 parts of cyclohexanone (green coloring composition 3) 4 parts of copper phthalocyanine pigment, Isoindolinone pigment (CI Pigment Yellow)
A green colored composition 3 was obtained in the same manner as the green colored composition 1 except that 4 parts of w139) were used. (Green coloring composition 4) 7.2 parts of copper phthalocyanine pigment,
Isoindolinone pigment (CI Pigment Ye)
A green colored composition 4 was obtained in the same manner as in the green colored composition 1, except that 0.8 part of (low 139) was used. (Red coloring composition) Red pigment: C.I. I Pigment Red 254 7 parts (“Irgafor Red B-CF” manufactured by Ciba Geigy) Red pigment: C.I. I Pigment Red 177 1 part (“Chromophthal Red A2B” manufactured by Ciba Geigy) • 7 parts of acrylic polymer • 4.3 parts of dipentaerythritol hexaacrylate • Photoinitiator (“Irgacure 907” manufactured by Ciba Geigy) 0.9 Part -Sensitizer ("EAB-F" manufactured by Hodogaya Chemical Co., Ltd.) 0.4 part -Cyclohexanone 79.4 parts (blue colored composition) -Blue pigment: C.I. I Pigment Blue 15: 6 5.1 parts ("Lionol Blue ES" manufactured by Toyo Ink Mfg. Co., Ltd.)-Purple pigment: C.I. I Pigment Violet 23 0.3 parts ("Lionogen Violet RL" manufactured by Toyo Ink Mfg. Co., Ltd.) 6.8 parts of acrylic polymer 4.4 parts of dipentaerythritol hexaacrylate )) 0.9 parts ・ Sensitizer (“EAB-F” manufactured by Hodogaya Chemical Co., Ltd.) 0.4 parts ・ Cyclohexanone 82.1 parts

The above coloring composition is applied on a glass substrate by spin coating, dried in a circulating oven at 70 ° C. for 20 minutes, and then a colored layer having a size of 100 μm × pixel.
Exposure was carried out using a 100 μm mask, developed with a 5% aqueous solution of sodium carbonate, washed well with water, and post-baked at 230 ° C. /
This was performed for 1 hour to produce a color filter. Incidentally, the green coloring composition, using any of the above green coloring composition, red,
Green and blue were applied in this order. The thickness of the colored layer was 1.8 μm for each color. Color characteristics were measured using the combination of these color filters and backlight unit. A backlight unit having a distribution I (λ) of the light intensity of the backlight with respect to the wavelength satisfying the following equation was used.

[0026]

(Equation 1)

Example 1 In Example 1, a green resist 1 was used. The color gamut is 100 color gamut of NTSC system.
% Was 80% in comparison with the%. The film thickness was 1.8 μm for each color.

Comparative Example 1 In Comparative Example 1, a green resist 2 was used. The color gamut is 100 color gamut of NTSC system.
% Was 77% of the total. The film thickness was 3.5 μm for each color.

Comparative Example 2 In Comparative Example 2, a green resist 3 was used. The color gamut is 100 color gamut of NTSC system.
% Was 77% of the total. The film thickness was 2.8 μm for each color.

Comparative Example 3 In Comparative Example 3, a green resist 4 was used. The color gamut is 100 color gamut of NTSC system.
% As compared to 72%. The film thickness was 1.8 μm for each color.

Table 1 shows the measurement results after panelization. In Example 1, the display characteristics were CRT or higher and the film thickness of each color was 2
Although the film thickness is good at μm or less, those of Comparative Examples 1 and 2 have a green film thickness exceeding 2 μm, and the result of Comparative Example 3 is that the display characteristics are deteriorated.

[0032]

[Table 1]

[0033]

According to the present invention, there is provided a green coloring composition for forming a green coloring layer having a film thickness of 2 μm or less and a Gy of chromaticity coordinates (Gx, Gy) in an XYZ color system of 0.6 or more. Since the green coloring composition is a green coloring composition containing a copper phthalocyanine pigment and an isoindolinone pigment in a transparent resin, the color reproduction area after paneling is based on the NTSC system without increasing the thickness of the green coloring layer. Color gamut 1
The green color composition for a color filter is capable of producing a color filter having a display performance of 72% as compared to 00%.

Claims (3)

[Claims] 1. A chromaticity coordinate (Gx) in an XYZ color system, which constitutes a color filter that reproduces color by an additive mixture of three colors of red (R), green (G), and blue (B) with a film thickness of 2 μm or less. , Gy) a green coloring composition used for forming a green coloring layer having a Gy of 0.6 or more, wherein the green coloring composition is a green coloring composition containing a copper phthalocyanine pigment and an isoindolinone pigment in a transparent resin. A green coloring composition for a color filter, comprising: 2. The method according to claim 1, wherein the isoindolinone pigment is one in all pigments.
The green coloring composition for a color filter according to claim 1, which contains 0 to 40%. 3. A color filter for color reproduction according to claim 1 or 2, wherein the color filter performs color reproduction by an additive mixture of three colors of red (R), green (G) and blue (B) with a film thickness of 2 μm or less. A color filter, wherein a green coloring layer is formed using the composition.