JP2001124920A - Color filter and liquid crystal display device equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide such a color filter coping with color reproduction which is difficult to realize with current materials or members, can be realized with improved lightness, while satisfying the EBU standard by using a color composition using a specified pigment and by artificially rendering light from a backlight unit as a discontinuously emitted light, and to provide a liquid crystal display device equipped such a filter. SOLUTION: A color layer consists of a color composition, containing a copper phthalocyanine pigment and a dioxazine violet pigment as the color material, and 80 wt.% or higher of the copper phthalocyanine pigment is C.I. Pigment Blue 15:6, while the dioxazine violet pigment is C.I. Pigment Violet 23 incorporated by 3 to 7 wt.% with respect to the whole pigment amount. The filter has a hologram film having such optical characteristics that it reflects light of a selected wavelength region.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a color filter provided with a hologram film having optical characteristics of reflecting a selected wavelength and a liquid crystal display device provided with the same.

[0002]

2. Description of the Related Art In a color liquid crystal display device, a liquid crystal layer sandwiched between two polarizing plates adjusts a voltage applied to an electrode provided in the layer for each pixel to thereby form a first polarizing plate. The display is performed by controlling the degree of polarization of the light from the backlight unit that has passed through and controlling the amount of light that passes through the second polarizing plate. By providing a color filter between the two polarizing plates, a color display is enabled. Therefore, the emission spectrum of the backlight unit and the spectral characteristics of the color filters are important factors that determine the color characteristics of the color liquid crystal display device. There are various types of color filters for display devices. Here, a color filter for liquid crystal display devices will be described as a representative example. Liquid crystal display devices are widely used from small-area devices such as clocks and cameras to large-area devices such as computer terminal displays and television image displays.In recent years, color displays have been used mainly for large-area applications. It is progressing rapidly.
Color filters are indispensable for color display of liquid crystal display devices, and are important components that determine the performance of color liquid crystal display devices, and those that are finely patterned in various shapes to display high-definition images are used. Have been. As a conventional color filter manufacturing method, for example, a dyeing method, an inkjet method, a printing method, a photoresist method, an etching method, and the like are known.

[0003] In the photoresist method, a colored liquid containing a coloring agent and a polymer conjugate is used, applied to a substrate and formed into a film, and then the colored layer is subjected to pattern exposure and development to form a colored layer of one color. I do. In this method, this step is repeated for each color, as in the dyeing method. However, since the dyeing step and the anti-dyeing treatment are not required, the number of steps is not only simpler than that of the dyeing method but also the spectral characteristics Control and reproducibility can be easily obtained. Furthermore, it is possible to produce a higher-definition color filter which has a high resolution and is difficult by a printing method or an ink-jet method, and has recently become a mainstream method of producing a color filter for a liquid crystal display device. .

As a backlight unit, a backlight unit using a light source of a three-wavelength band fluorescent lamp (hereinafter referred to as a "three-wave tube") having excellent color rendering properties is widely used. The backlight unit is a unit that includes a three-wavelength tube and a member such as a light guide plate and a diffusion plate, and generates light incident on the first polarizing plate. With the advent of these high-definition 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 display devices. Furthermore, in recent years, it has begun to spread as a monitor for a desktop personal computer that utilizes the features of energy saving and space saving, and has attracted attention as a display device replacing a conventional CRT monitor. However, at present, the color reproduction characteristics of the liquid crystal display device are inferior to those of the CRT. Therefore, there is a demand for a liquid crystal display device that is brighter and has higher color purity. Further, its realization is one of the keys to the widespread use of liquid crystal display devices in the field of television or the field of multimedia display devices.

[0005]

In order to achieve the above object, ideally, a backlight unit which emits discontinuously red, green and blue light as shown in FIG.
It is desired to realize a color filter that transmits red, green, and blue light emission rectangularly as shown in FIG. However, the emission intensity spectrum of a practically used backlight unit has a continuous distribution as shown in FIG. Also, the spectral spectrum of the color filter has a non-rectangular transmission characteristic as shown in FIG. Therefore, there is a limit in reproducing a color with high color purity by using light obtained by dispersing light emitted from the backlight unit using a color filter. As in the above example, the emission intensity spectrum of a practically used backlight unit generally ranges from 470 nm to about 520 nm,
It often has a strong emission intensity in the vicinity of 570 nm to 600 nm. It is necessary for a liquid crystal display device having excellent display quality to suppress light emission of a portion that does not exist in the light emission intensity of such an ideal backlight unit. In view of the above, an object of the present invention is to provide an EBU (European Broadcastin) by making the color of a backlight unit discontinuously emit light in a pseudo manner with a coloring composition using a specific pigment to achieve color reproduction that is difficult to achieve with current materials.
g Union (European Broadcasting Union) standards and to provide a color filter realizing an improvement in brightness and a liquid crystal display device having the same.

[0006]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, the coloring layer of the color filter has a coloring material containing a copper phthalocyanine pigment and a dioxazine violet pigment. , 80% by weight or more of the copper phthalocyanine pigment is C.I. I PigmentBlu
e 15: 6, and the dioxazine violet pigment is C.I. Pigment Violet 23, 3 to 7% by weight based on the total amount of the pigment, C.I. IPigment
By using a color filter comprising a coloring composition of Violet 23 and having a hologram film having optical characteristics for reflecting a selected wavelength, it is possible to obtain a liquid crystal display device which is compliant with the EBU standard and has excellent brightness. And found the present invention.

More specifically, general principles regarding holograms are described in several documents and technical books, for example, Chapter 2 of “Holographic Display” (edited by Junpei Tsujiuchi; Sangyo Tosho). According to these, two light beams are generally coherent, and one of the laser beams is irradiated on a recording object,
A photosensitive recording medium, for example, a photographic plate is placed at a position where the total reflection light can be received. The recording medium is irradiated directly with the other coherent light in addition to the reflected light from the object without hitting the object. The light reflected from the object is referred to as target light, and the light directly illuminating the medium is referred to as reference light, and interference fringes between the reference light and the target light are recorded as image information. Next, when the processed recording medium is exposed to light and observed at an appropriate eye position, the light from the illumination light source emits the wavefront of the reflected light that first arrived at the recording medium from the object during recording. Is diffracted by the hologram so as to reproduce the object, and as a result, an object image similar to the real image of the object is observed three-dimensionally. A hologram formed by causing the reference light and the target light to enter the recording medium from the same direction is known as a transmission hologram. On the other hand, holograms formed by making incident from opposite sides of a recording medium are generally known as reflection holograms. The transmission hologram can be obtained by a known method as disclosed in, for example, US Pat. No. 3,506,327 and US Pat. No. 3,894,787. Also, reflection holograms are described, for example, in US Pat. No. 3,532,406.
Can be produced by a known method disclosed in US Pat. Among them, the reflection hologram has a characteristic of selectively reflecting only the light used for exposure, and when manufactured using laser radiated light or the like, it selectively reflects light with a narrow half-width. This has been found to be a means for removing only light in an extremely narrow wavelength range, and the present invention has been realized.

That is, the invention according to claim 1 of the present invention relates to a color filter comprising two or more colored layers having different spectral characteristics arranged adjacently on the same substrate.
In the coloring layer, the coloring material contains a copper phthalocyanine pigment and a dioxazine violet pigment, and 80% by weight or more of the copper phthalocyanine pigment is C.I. I Pigment Bl
ue 15: 6, and the dioxazine violet pigment is C.I. I Pigment Violet 2
3, characterized in that the hologram film is made of a coloring composition in an amount of 3 to 7% by weight based on the total amount of the pigment, and is further provided with a hologram film having optical characteristics of reflecting light at a selected wavelength.

According to a second aspect of the present invention, in the color filter according to the first aspect, the half-value width of the selected wavelength reflection is 30.
nm or less. Therefore, it is possible to selectively reflect only a desired wavelength in the emission spectrum of the backlight unit having a continuous distribution.

According to a third aspect of the present invention, in the color filter according to the first or second aspect, the selected wavelength reflection of the hologram film is specular reflection. When selectively reflecting only the desired wavelength of the backlight unit, if the light is reflected in a direction other than the specular reflection direction, the reflected light is re-reflected by another member and is incident on an adjacent pixel. It may affect the performance. If the selected wavelength reflection is specular reflection, there is no such fear.

According to a fourth aspect of the present invention, in the color filter according to any one of the first to third aspects, the maximum reflection wavelength of the reflected light of the selected wavelength of the hologram is 470 nm to 520 nm. It is characterized by: Therefore, it is possible to cut light having a strong light emission intensity in the vicinity of 470 nm to 520 nm, which is generally included in a practically used backlight unit.

According to a fifth aspect of the present invention, in the color filter according to any one of the first to third aspects, the maximum reflection wavelength of the reflected light of the selected wavelength of the hologram is 570 nm to 600 nm. Features. For this reason, it is possible to cut light having a strong light emission intensity in the vicinity of 570 nm to 600 nm, which is generally included in a practically used backlight unit. According to a sixth aspect of the present invention, there is provided a liquid crystal display device including the color filter according to any one of the first to fifth aspects.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a color filter of the present invention and a method for manufacturing the same will be described. In the color filter of the present invention, a color filter may be formed on a hologram film provided on a transparent substrate, or a hologram film may be provided on a color filter formed on a transparent substrate. Furthermore, a color filter and a hologram film may be separately provided on opposite sides of the transparent substrate. The hologram film may be formed in advance on a transparent substrate, or a hologram prepared in advance may be bonded to a substrate on which a color filter is formed. In addition, when used for a TFT-LCD or the like, an ITO (transparent conductive film) is formed on a color filter or an alignment film of polyimide is provided. Holograms may be attached.

As the copper phthalocyanine pigment constituting the coloring composition for a color filter of the present invention, a crystalline copper phthalocyanine pigment such as α-type, β-type and ε-type can be used. Especially, since the maximum transmission wavelength is the shortest wavelength, ε-type copper phthalocyanine (C. IPigment Blue) is used.
e 15: 6) are preferably used. C. I Pigm
When the ratio of ent Blue 15: 6 is less than 80% by weight of the copper phthalocyanine pigment, the y value increases,
It is difficult to match EBU standard y = 0.06.

The dioxazine violet pigment constituting the coloring composition for a color filter of the present invention functions to decrease the y value without increasing the film thickness by adding a small amount to the blue pigment. I Pigment Vi
Olet 23 is preferably used.

The content of the dioxazine violet pigment in the coloring composition of the present invention is 3 to 7 based on the whole pigment.
% By weight. When the content of the dioxazine violet pigment is less than 3% by weight, E
It is difficult to form a blue color filter having a BU standard and a film thickness of 2 μm or less. On the other hand, when the content of the dioxazine violet pigment exceeds 7% by weight, the chromaticity x value of the blue color filter formed using the colorant exceeds the EBU standard of 0.15 and deviates from the standard. Would. Therefore, the content of the dioxazine violet pigment is 7% by weight or less, preferably 6% by weight or less.

The coloring composition for a color filter of the present invention comprises:
After the copper phthalocyanine pigment and the dioxazine violet pigment are mixed in the above ratio, the resulting pigment mixture can be finely dispersed in a transparent resin by a known method to produce the pigment mixture. Alternatively, a copper phthalocyanine pigment and a dioxazine violet pigment separately dispersed in a transparent resin can be produced by mixing the two such that the content of the dioxazine violet pigment is the above-mentioned ratio.

The color filter may be manufactured by any known method such as a dyeing method, an ink jet method, a printing method, a photoresist method, and an etching method. However, in consideration of high definition, controllability of spectral characteristics and reproducibility, a coloring composition in which a pigment or dye is dispersed or dissolved in a suitable solvent together with a photoinitiator and a polymerizable monomer in a transparent resin. After forming a film on a transparent substrate, a photoresist method of producing a color filter by repeating the process of forming a colored layer of one color by pattern exposure and development of the colored layer for each color is more preferable.

The transparent resin used in the photoresist method is not particularly limited as long as it can be dissolved in an organic solvent, an aqueous alkaline solution, or water in a light irradiation portion or a light shielding portion. However, considering that the working environment and environmental problems at the global level are being taken up, those that can be dissolved in water or an aqueous alkaline solution are more desirable. Such a polymer conjugate generally includes a hydrophilic monomer represented by (meth) acrylic acid, a monomer having 2-hydroxyethyl, acrylamide, N-vinylpyrrolidone or an ammonium salt, and a (meth) acrylic monomer. Acid esters, vinyl acetate, styrene,
It is known that a monomer is copolymerized with a lipophilic monomer represented by N-vinylcarbazole or the like at an appropriate mixing ratio by a known method. Specific examples are described in JP-A-57-16408, JP-A-2-181704, and JP-A-2-181704.
199403 and the like, but are not limited thereto.
These transparent resins are prepared by combining a radical polymerizable monomer having an ethylenically unsaturated group, a cationic polymerizable monomer having an oxirane ring or an oxetane ring, a radical generator, an acid generator, or a base generator. It can be used as a negative type resist, that is, a type in which a light shielding portion is removed by development. Also,
T-butyl carbonate of polyhydroxystyrene, t
Resins represented by -butyl ester, tetrahydroxypyranyl ester, tetrahydroxypyranyl ether and the like can also be used. This type of resin can be used as a positive type resist, that is, a type in which a light-irradiated portion is removed by development in combination with a photoacid generator or a photobase generator.

Specific examples of the radical polymerizable monomer having an ethylenically unsaturated group include those having at least one ethylenically unsaturated bond in a structural unit,
It contains a polyfunctional vinyl monomer in addition to a monofunctional vinyl monomer, and may be a mixture thereof. Specifically, (meth) acrylic acid, itaconic acid, maleic acid, (meth) acrylamide, diacetone acrylamide, high boiling vinyl monomers such as 2-hydroxyethyl (meth) acrylate, and further, an aliphatic polyhydroxy compound, For example, ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, tetrapropylene glycol, neopentyl glycol, 1,3-propanediol, 1,4-butanediol , 1,5-pentanediol, 1,6-hexanediol, 1,10-
Decanediol, trimethylolpropane, pentaerythritol, dipentaerythritol, sorbitol,
Di- or poly (meth) acrylates such as mannitol, alicyclic monomers such as dimethylol tricyclodecane monoacrylate and dimethylol tricyclodecane diacrylate, and aromatic polyhydroxy compounds such as hydroquinone, resorcinol, and catechol Di- or poly (meth) acrylates, such as pyrogallol, bisphenol A, ethylene oxide-modified (meth) acrylates of isocyanuric acid, etc., as well as 2-phenoxyethyl acrylate, 2-phenoxyethyl methacrylate, phenol ethoxylate monoacrylate, p-Chlorophenyl acrylate, KAYARAD-R551
(Manufactured by Nippon Kayaku Co., Ltd.), but not limited thereto. Among them, those which are liquid at normal temperature and normal pressure and have a boiling point of 100 ° C. or higher at normal pressure are more preferable. These may be used as a mixture of two or more as necessary.

Specific examples of cationically polymerizable monomers having an oxirane ring or an oxetane ring include Adeka Resin EP-4900, EP4080, and EP4080 manufactured by Asahi Denka Kogyo.
P-4000ED-505, ED-506, Dainippon Ink and Chemicals Epicron S-129, 430, 430-L,
725, 720, 705, 707, 1600, Toto Kasei Epototo YDF-170, 175, 2001, 20
04, YH-434, YH-434L, ST-300
0, YD-716, YD-300, PG-202, PG
-207, YD-171, YD172, Araldite PY-306 manufactured by Ciba Specialty Chemicals, MY
-720, XN1034, DY022, CY184, C
Y192, CY179, CY177, CY175, PT
810, oiled shell epoxy epicoat 807, 10
31, YX-4000, 604, YDE205, 191
P, 190P, 871, 872, RXE15, Sumitomo Chemical Sumiepoxy ELM-434, ELM-434H
V, ELM-120, EPOMIKR71 manufactured by Mitsui Chemicals, Inc.
0, R540, R508, R531, GA manufactured by Nippon Kayaku
N, GOT, AK-601, 3-ethyl-3-hydroxymethyloxetane, 1,4-bis ((3-ethyl-3-oxetanylmethoxy) methyl) manufactured by Toa Gosei Chemical
Benzene and the like can be mentioned, but not limited thereto.

Examples of the photoinitiator that generates an active species that promotes the polymerization of these monomers include a photoacid generator, a photobase generator, and a photoradical generator.

Specific examples of the photoacid generator include diaryliodonium salts, triarylsulfonium salts, triarylphosphonium salts, iron arene complexes and the like, but are not limited thereto. Absent.

Specifically, examples of the diallyl iodonium salt include diphenyl iodonium chloride, diphenyl iodonium trifluoromethanesulfonate,
Diphenyliodonium mesylate, diphenyliodonium mesylate, diphenyliodonium tosylate, diphenyliodonium bromide, diphenyliodo
Donium tetrafluoroborate, diphenyliodonium hexafluorophosphate, diphenyliodonium hexafluoroantimonate, diphenyliodonium hexafluoroarsenate, bis (p-tert-butylphenyl) iodonium hexafluoro Phosphate, bis (p-tert-butylphenyl)
Iodonium mesylate, bis (p-tert-butylphenyl) iodonium tosylate, bis (p-tert-butylphenyl)
(S-butylphenyl) iodonium trifluoromethanesulfonate, bis (p-tert-butylphenyl) iodonium tetrafluoroborate, bis (p
-Tert-butylphenyl) iodonium chloride, bis (p-chlorophenyl) iodonium chloride, bis (p-chlorophenyl) iodonium tetrafluoroborate and the like.

Examples of triarylsulfonium salts include triphenylsulfonium chloride, triphenylsulfonium bromide, tri (4-methoxyphenyl) sulfonium tetrafluoroborate, tri (p-
Methoxyphenyl) sulfonium hexafluorophosphonate, tri (4-ethoxyphenyl) sulfonium tetrafluoroborate and the like.

Examples of triarylphosphonium salts include triphenylphosphonium chloride, triphenylphosphonium bromide, tri (4-methoxyphenyl) phosphonium tetrafluoroborate, tri (p-
Methoxyphenyl) phosphonium hexafluorophosphonate, tri (4-ethoxyphenyl) phosphonium
And tetrafluoroborate.

Specific examples of the photobase generator include bis [[(2-nitrobenzyl) oxy] carbonylhexane-1,6-diamine, nitrobenzylcyclohexylcarbamate, di (methoxybenzyl) hexamethylenedicarbamate, and the following: Compounds having the chemical structural formulas such as

[0028]

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[0029]

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[0030]

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[0031]

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Specific examples of the photoradical generator include te
rt-butylperoxy-iso-butarate, 2,5-dimethyl-2,5-bis (benzoyldioxy) hexane,
1,4-bis [α- (tert-butyldioxy) -iso-
Propoxy] benzene, di-tert-butyl peroxide, 2,5-dimethyl-2,5-bis (tert-butyldioxy) hexene hydroperoxide, α- (iso-propylphenyl) -iso-propyl hydroperoxide,
2,5-bis (hydroperoxy) -2,5-dimethylhexane, tert-butyl hydroperoxide, 1,1-bis (tert-butyldioxy) -3,3,5-trimethylcyclohexane, butyl-4,4-bis (T-butyldioxy) valerate, cyclohexanone peroxide, 2,
2 ', 5,5'-tetra (tert-butylperoxycarbonyl) benzophenone, 3,3', 4,4'-tetra (ter
t-butylperoxycarbonyl) benzophenone, 3,
3 ′, 4,4′-tetra (tert-amylperoxycarbonyl) benzophenone, 3,3 ′, 4,4′-tetra (ter
t-hexylperoxycarbonyl) benzophenone,
3,3'-bis (tert-butylperoxycarbonyl)
Organic peroxides such as -4,4'-dicarboxybenzophenone, tert-butylperoxybenzoate, di-tert-butyldiperoxyisophthalate, and 9,10-
Anthraquinone, 1-chloroanthraquinone, 2-chloroanthraquinone, octamethylanthraquinone, 1,2-
Examples thereof include quinones such as benzuansuraquinone and benzoin derivatives such as benzoin methyl, benzoin ethyl ether, α-methyl benzoin and α-phenyl benzoin.

As a specific example of the pigment, Pigment R
ed9, 19, 38, 43, 97, 122, 123, 14
4, 149, 166, 168, 177, 179, 18
0, 192, 208, 215, 216, 217, 22
0, 223, 224, 226, 227, 228, 24
0, Pigment Green 7, 36, Pigment Yellow 20,
24, 86, 81, 83, 93, 108, 109, 11
0, 117, 125, 137, 138, 139, 14
7, 148, 153, 154, 166, 168, 18
5, Pigment Orange 36 and the like, but are not limited thereto. Further, these pigments may be used in combination of two or more in order to obtain a desired hue.

As the transparent substrate used in the production of the color filter of the present invention, any one can be used as long as it is transparent and has a certain strength and is not affected by the coloring composition. , A glass plate, a polycarbonate plate, a polymethyl methacrylate plate, a polyester film, and the like, but are not limited thereto. When the coloring composition is applied to the substrate, it can be performed using a spin coater, a die coater, a roll coater, a bar coater, or the like.

When the coloring composition is applied, it may be diluted with an appropriate solvent, if necessary, but in that case, it is necessary to apply the coloring composition on a substrate and then dry it. Solvents that can be used when preparing the coloring composition, as long as the substrate to be coated is not affected by dissolution, swelling, turbidity, erosion, and the like, and most of generally used organic solvents are used. Can be used. Specifically, water, methanol, ethanol, propanol, isopropyl alcohol, n-butanol, t-butanol, 2-methylpropyl alcohol, chloroform, dichloromethane, carbon tetrachloride, 1,4-dioxane, tetrahydrofuran,
Acetone, ethyl methyl ketone, ethyl acetate, acetonitrile, toluene, xylene, cyclohexane, cyclohexanone, n-pentane, n-heptane, n-hexane, 2-methoxyethanol, 2-ethoxyethanol, 2-butoxyethanol, 2-ethoxyethyl Acetate, 2-butoxyethyl acetate, 2-methoxyethyl acetate, 2-ethoxyethyl ether, 2-
(2-ethoxyethoxy) ethanol, 2- (2-butoxyethoxy) ethanol, 2- (2-ethoxyethoxy) ethyl acetate, 2- (2-butoxyethoxy)
Examples thereof include ethyl acetate, 2-phenoxyethanol, and diethylene glycol dimethyl ether, but are not limited thereto, and any solvent satisfying the above requirements can be used. Further, two or more solvents may be mixed and used as necessary.

On the other hand, a hologram film having an optical characteristic of reflecting light of a selected wavelength is basically composed of (A) a resin which is soluble in a solvent and is solid at normal temperature and normal pressure, and (B) a liquid which is liquid at normal temperature and normal pressure and is normally A polymerizable monomer having at least one or more radically polymerizable ethylenically unsaturated bonds having a boiling point of 100 ° C. or higher at a pressure and having a different refractive index from the component (A);
(C) a photoinitiator that generates an active species that promotes the polymerization of the polymerizable monomer by actinic radiation, and (D) a sensitizing dye that sensitizes the photoinitiator of component (C) to visible light with a solvent. After being melted and formed into a film, the recording medium can be manufactured by irradiating a coherent chemical radiation reference beam and a target beam of the same radiation to generate an interference pattern.

Component (A) The resin which is soluble in a solvent and which is solid at normal temperature and pressure includes polymethacrylic acid esters, polyacrylic acid esters and partial hydrolysates thereof, polyvinyl acetate, polystyrene, polyvinyl butyral,
Polyvinyl acetate, polyvinyl formal, polyvinyl acetal, polychloroprene, polyvinyl chloride, cellulose acetate, cellulose acetate butyrate, methyl cellulose, ethyl cellulose, chlorinated polyethylene, chlorinated polypropylene, poly-N-vinyl carbazole, poly-N-vinyl pyrrolidone , Polyacetic acid /
Copolymerizable monomers such as vinyl acrylate, polyacetic acid / vinyl methacrylate, ethylene / vinyl acetate copolymer and styrene, maleic anhydride, acrylic acid, methacrylic acid, acrylate, methacrylate, acrylamide, methacrylamide, etc. And various phenolic compounds such as bisphenol A, bisphenol AD, bisphenol B, bisphenol AF, bisphenol S, nopolak, o-cresol novolak, p-alkylphenol novolak and the like. Examples include, but are not limited to, thermosetting resins typified by an epoxy resin produced by a condensation reaction with chlorohydrin. Further, two or more kinds of these thermoplastic resins and thermosetting resins which are soluble in a solvent and which are solid at ordinary temperature and ordinary pressure may be used as needed.

Component (B) has at least one radically polymerizable ethylenically unsaturated bond which is liquid at normal temperature and pressure and has a boiling point of 100 ° C. or higher at normal pressure, and is refracted by component (A). The polymerizable monomer having a different ratio includes a polyfunctional vinyl monomer in addition to a monofunctional vinyl monomer, and may also be a mixture thereof.
In practice, according to Kogelnik's theory, component (A)
It is desirable that the difference in refractive index between (B) and (B) is 0.03 or more. Specifically, (meth) acrylic acid, itaconic acid,
High-boiling vinyl monomers such as maleic acid, (meth) acrylamide, diacetone acrylamide, 2-hydroxyethyl (meth) acrylate, and further, aliphatic polyhydroxy compounds, for example, ethylene glycol, diethylene glycol, triethylene glycol, Tetraethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, tetrapropylene glycol, neopentyl glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol , 1,10
Di- or poly (meth) acrylates such as decanediol, trimethylolpropane, pentaerythritol, dipentaerythritol, sorbitol and mannitol, and fats such as dimethylol tricyclodecane monoacrylate and dimethylol tricyclodecane diacrylate; In addition to cyclic monomers and aromatic polyhydroxy compounds, for example, di- or poly (meth) acrylates such as hydroquinone, resorcin, catechol, pyrogallol and bisphenol A, ethylene oxide-modified (meth) acrylates of isocyanuric acid, and 2- Phenoxyethyl acrylate, 2-phenoxyethyl methacrylate, phenol ethoxylate monoacrylate, p-chlorophenyl acrylate, KAYARAD-R551
(Manufactured by Nippon Kayaku Co., Ltd.).

Further, as the photoinitiator of the component (C), those described above when preparing a color filter can be used.

Specific examples of the sensitizing dye of the component (D) include:
Cyanine or merocyanine dyes, coumarin dyes,
Examples include chalcone dyes, xanthene dyes, thioxanthene dyes, azurenium dyes, squarylium dyes, porphyrin dyes, and more specifically, edited by Shin Okawara et al., “Dye Handbook” (1986).
(Kodansha), edited by Shin Okawara et al., “Chemistry of Functional Dyes” (1
981 (CMC), edited by Tadasaburo Ikemori et al., “Specially Functional Materials” (1986, CMC), but are not limited thereto, and may be any other visible light. Dyes and sensitizers that absorb light in the region. These may be used in two or more at any ratio as needed.

On the other hand, in order to obtain a bright hologram,
(A) a resin which is soluble in a solvent and is solid at normal temperature and normal pressure;
(B) liquid at normal temperature and normal pressure and having a boiling point of 100 at normal pressure
The combination of at least one radically polymerizable ethylenically unsaturated bond having a temperature of not less than ℃ and a polymerizable monomer having a different refractive index from the component (A) is problematic.
Some of them have already been described in U.S. Pat. No. 4,942,112, U.S. Pat. No. 5,098,803, JP-A-2-3081, JP-A-2-3082, and JP-A-5-107999.
Gazette, JP-A-5-94014, JP-A-7-2616
40, JP-A-8-44277 and the like.

As a light source suitable for the hologram recording material, any coherent light can be used.
In general, helium-cadmium laser, algo laser,
YAG laser, helium-neon laser, krypton laser can be used

On the other hand, the liquid crystal display device of the present invention has a conventionally known structure except for a color filter to be used, and basically includes a liquid crystal filled between a pair of transparent substrates. A pixel electrode is provided on the transparent electrode, and a counter pixel electrode is provided on the color filter side on the other transparent plate. Needless to say, the respective transparent substrates are arranged such that the pixel electrodes formed on the respective transparent substrates face each other. FIG. 5 shows an example of a liquid crystal display device incorporating such a color filter of the present invention. In the liquid crystal display device shown in FIG. 5, liquid crystal is sealed between a pair of transparent substrates 11 and 21 such as a glass substrate. As a liquid crystal,
Usually, a twisted nematic liquid crystal (TN) or a super twisted nematic liquid crystal (STN) is used, and the liquid crystal molecules are twisted and aligned in a range of 90 to 270 degrees according to each driving mode. On the other hand, the pixel electrode 12
Is formed, and an alignment film 13 on which an alignment process such as rubbing is performed is provided thereon. A polarizing plate 14 is provided on the upper surface of the transparent substrate 11. The other transparent substrate 21
The color filter 22 of the present invention including a red coloring layer 221, a green coloring layer 222, and a blue coloring layer 223 via a black matrix 23 (light shielding pattern)
Is provided. On this color filter 22, a hologram film 27 with an adhesive is provided, and furthermore, a counter electrode 24 is provided, on which an alignment film 25 that has been subjected to an alignment treatment in the same manner as the alignment film 13 is provided. . Further, a polarizing plate 26 is provided on the hologram film 27. Note that a backlight unit (not shown) is provided below the polarizing plate 14.

[0044]

The present invention will be described in more detail with reference to the following examples, but it should not be construed that the invention is limited thereto.

A blue, green and red coloring composition for preparing a color filter was prepared as follows. The acrylic varnish has a monomer composition of styrene / methacrylic acid / methyl methacrylate / butyl methacrylate = 20/2.
A 20% by weight cyclohexanone solution of an acrylic resin having a molecular weight of about 40,000 at 0/30/30 (weight ratio) was used.

The method for producing the coloring composition is specifically described below. After uniformly stirring and mixing a mixture having the following composition, the mixture was dispersed in a sand mill using glass beads having a diameter of 1 mm for 5 hours, and then filtered through a 5 μm filter to prepare a copper phthalocyanine dispersion. (Copper phthalocyanine dispersion) ε-type copper phthalocyanine (Toyo Ink Mfg. Co., Ltd. “Lionol Blue ES”) 60 parts Dispersant (Zeneca “Solpars 20000”) 6 parts Acrylic varnish 200 parts Cyclohexanone 134 parts Similarly, the following composition: After uniformly stirring and mixing the mixture, the mixture was dispersed with a sand mill using glass beads having a diameter of 1 mm for 5 hours, and then filtered with a 5 μm filter to prepare a dioxazine violet dispersion. (Dioxazine Violet Dispersion) Dioxazine Violet 60 parts (Toyo Ink Mfg. Co., Ltd. "Lionogen Violet RL" Dispersant (Zeneca Co., Ltd., "Solpars 20000") 6 parts Acrylic varnish 200 parts Cyclohexanone 134 parts Next, these Using the dispersion, a blue-colored composition was prepared by mixing copper phthalocyanine and dioxazine violet (Blue-colored composition) A mixture having the following composition was stirred and mixed so as to be uniform, and then filtered through a 1 μm filter. Thus, a blue resist material containing 6% by weight of dioxazine violet in the pigment was obtained: Copper phthalocyanine dispersion 141 parts Dioxazine violet dispersion 9 parts Acrylic varnish 10 parts Trimethylolpropane acrylate 19 parts (Shin Nakamura Chemical Company “NK Ester AT” PT ") photoinitiator (manufactured by Ciba-Geigy" Irgacure 907 ") 4 parts Sensitizer (Hodogaya Chemical Co., Ltd." EAB-F ") 2 parts Cyclohexanone 214 parts

(Green Coloring Composition) The green coloring composition was prepared in the same manner as the blue coloring composition so that the compositions were as follows. Green pigment: C.I. I. Pigment Green 36 11 parts (“Lionol Green 6YK” manufactured by Toyo Ink Mfg. Co., Ltd.) Yellow pigment: C.I. I. Pigment Yellow 150 8 parts (Bayer "Fanchon First Yellow Y-5688") Dispersant (Zeneca "Solspers 20000") 2 parts Acrylic varnish 102 parts Trimethylolpropane triacrylate 14 parts (Shin-Nakamura Chemical Co., Ltd.) NK ester ATMPT ") Photoinitiator (" Irgacure 907 "manufactured by Ciba Geigy) 4 parts Sensitizer (" EAB-F "manufactured by Hodogaya Chemical Co., Ltd.) 2 parts Cyclohexanone 257 parts

(Red coloring composition) The green coloring composition was prepared in the same manner as the blue coloring composition so that the compositions were as follows. Red pigment: C.I. I. Pigment Red 254 18 parts (“Irgafor Red B-CF” manufactured by Ciba Geigy) Red pigment: C.I. I. Pigment Red 177 2 parts (“Chromophthal Red A2B” manufactured by Ciba Geigy) Dispersant (“Solpars 20000” manufactured by Zeneca) 2 parts Acrylic varnish 108 parts Trimethylolpropane triacrylate 13 parts (“NK ester” manufactured by Shin-Nakamura Chemical Co., Ltd.) ATMPT ") Photoinitiator (" Irgacure 907 "manufactured by Ciba Geigy) 3 parts Sensitizer (" EAB-F "manufactured by Hodogaya Chemical Co., Ltd.) 1 part Cyclohexanone 253 parts

(Hologram film 1) 100 parts by weight of Bisphenol A type epoxy resin epicoat 1009 (manufactured by Yuka Shell Epoxy Co., Ltd.), 50 parts by weight of tripropylene glycol diacrylate and 5 parts by weight of diphenyliodonium hexafluorophosphate, 3'-
Carbonyl bis (7-diethylaminocoumarin) 0.2
A solution obtained by mixing and dissolving 5 parts by weight in 160 parts by weight of 2-butanone was used as a photosensitive solution. The photosensitive liquid was applied on a PET film having a thickness of 100 μm so that the film thickness after drying was about 15 μm, and dried in an oven at 80 ° C. for 10 minutes to prepare a hologram recording medium.

The hologram recording medium was bonded to an aluminum-deposited optical mirror via n-octane, and irradiated with an argon laser (488 nm) from the vertical direction of the optical mirror to produce a hologram. Heat treatment was performed. FIG. 6 shows the spectral characteristics of the produced reflection hologram.
Shown in

(Hologram Film 2) A hologram recording medium was produced in the same manner as in the hologram film 1.
The hologram recording medium is bonded to an aluminum-deposited optical mirror through n-octane, and irradiated with a YAG laser (532 nm) at an angle of 40 degrees from the perpendicular direction to the optical mirror to produce a hologram. Heat treatment was performed for 5 minutes. FIG. 7 shows the spectral characteristics of the produced reflection hologram.
Shown in (Hologram film 3) Also, the hologram film 1 and the hologram film 2 are bonded to an optical adhesive (Nitto Denko Corporation).
Manufactured by HJ-9150W) to obtain a laminated hologram film 3. FIG. 8 shows the spectral characteristics.

(Color Filter 1) A red coloring composition was applied to a glass substrate by spin coating to a thickness of 1.8 μm. After drying, the resultant was exposed to a stripe pattern using an exposure machine and developed for 90 seconds with an alkali developing solution to obtain a striped red colored layer. The alkaline developer has the following composition. Sodium carbonate 1.5% by weight Sodium bicarbonate 0.5% by weight Anionic surfactant (Kao Perillex NBL) 8.0% by weight Water 90% by weight

Next, the green coloring composition is similarly applied by spin coating so that the film thickness becomes 1.8 μm. After drying, the striped colored layer was exposed to a place shifted from the red colored layer by an exposure machine and developed to obtain a green colored layer adjacent to the red colored layer.

Furthermore, a blue colored layer having a thickness of 1.8 μm and adjacent to the red and green colored layers was obtained in the same manner as for the red and green colors.

The shape of the colored layer of each color was good, and the resolution was also good. Finally, the obtained color filter was heated in an oven at 230 ° C. for 30 minutes to completely react the remaining polymerizable functional groups. Thus, a color filter having a striped colored layer of three colors of red, green and blue on a transparent substrate was obtained.

The hologram film 1 is coated on this color filter with an optical adhesive (HJ-91 manufactured by Nitto Denko Corporation).
(50 W) to remove the PET film. Thus, a color filter 1 with a hologram was obtained.

(Color Filter 2) In the same manner as the color filter 1, the hologram film 2 was laminated instead of the hologram film 1, whereby a color filter 2 with hologram was obtained.

(Color filter 3) Similarly, instead of the hologram film 1, the hologram film 3 was adhered to produce a color filter 3 with a hologram.

(Comparative Example) Three colored layers of red, blue and green were formed on a glass substrate in the same manner as in the color filter 1 except that the hologram film was not laminated.

The color filter 1 manufactured as described above,
A liquid crystal display device was assembled using the color filters 2 and 3, and the color filter of the comparative example, and the results of evaluation using a backlight unit having an emission intensity spectrum as shown in FIG. 9 are shown in Table 1.

[0061]

[Table 1]

[0062]

The color filter according to the present invention has an EBU.
Provide a liquid crystal display device that is compliant with standards and has high brightness.

[Brief description of the drawings]

FIG. 1 shows an example of an emission spectrum of an ideal backlight unit.

FIG. 2 shows an example of a spectrum spectrum of an ideal color filter.

FIG. 3 shows an example of an emission spectrum of a backlight unit that has been put into practical use.

FIG. 4 shows an example of a spectral spectrum of a color filter that has been put into practical use.

FIG. 5 shows an example (cross section) of the liquid crystal display device according to the present invention.

FIG. 6 shows the reflection characteristics of the hologram film 1.

FIG. 7 is a reflection characteristic of the hologram film 2.

FIG. 8 is a reflection characteristic of the hologram film 3.

FIG. 9 shows light emission characteristics of a backlight unit used in an example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Transparent glass substrate 12 ... Pixel electrode 13 ... Alignment film 14 ... Polarizer 15 ... Backlight 21 ... Transparent glass substrate 22 ... Color filter 221 ... Red pixel 222 ... Green pixel 223 ... Blue pixel 23 ... Light shielding pattern 24 ... Counter electrode 25 Alignment film 26 Polarizer 27 Hologram film having optical characteristics of selective wavelength reflection

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hidetoshi Hagiwara 1-5-1, Taito, Taito-ku, Tokyo Inside Toppan Printing Co., Ltd. (72) Inventor Takeo Sugiura 1-5-1, Taito 1-5-1, Taito-ku, Tokyo F-term in Toppan Printing Co., Ltd. (reference) 2H048 BA02 BA45 BA47 BA48 BB02 BB10 BB14 BB15 BB24 BB44 2H049 CA05 CA09 CA22 CA28 CA30 2H091 FA02Y FA08X FA08Z FA19Y FA41Z FB02 FB12 FB13 FD15 FD24 LA15 LA16

Claims (6)

[Claims] 1. A color filter comprising two or more colored layers having different spectral characteristics arranged adjacent to each other on the same substrate, wherein the colored material contains a copper phthalocyanine pigment and a dioxazine violet pigment. , 80% by weight or more of the copper phthalocyanine pigment is C.I. I Pigmen
t Blue 15: 6, and the dioxazine violet pigment is C.I. I Pigment Viol
et23. A color filter comprising a coloring composition that is 3 to 7% by weight based on the total amount of the pigment, and further comprising a hologram film having optical characteristics of reflecting a selected wavelength. 2. A hologram having a half-value width of reflection at a selected wavelength of 30.
2. The color filter according to claim 1, wherein the thickness of the color filter is at most nm. 3. The color filter according to claim 1, wherein the selected wavelength reflection of the hologram film is specular reflection. 4. The color filter according to claim 1, wherein a maximum reflection wavelength of the reflected light of the selected wavelength reflection of the hologram is from 470 nm to 520 nm. 5. The color filter according to claim 1, wherein a maximum reflection wavelength of reflected light of the selected wavelength reflection of the hologram is from 570 nm to 600 nm. 6. A liquid crystal display device comprising the color filter according to claim 1. Description: