JP2001290019A - Color filter and liquid crystal display device equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color filter by using a specified dye and by suppressing emission of intense light from the undesirable part of a back light unit so that a liquid crystal display device having excellent chromaticity which is difficult to realize by the dyes currently used can be obtained, and to provide a liquid crystal display device equipped with the filter. SOLUTION: The color layer 22 is formed by using a coloring composition in which the dyestuff consists of a mixture of dyes containing at least one kind of oil soluble dyes, dispersion dyes and basic dyes and copper phthalocyanine pigments, the mixing ratio of the dyes to the copper phthalocyanine pigments ranges 10:90 to 50:50 by weight and >=80 wt.% of the copper phthalocyanine pigments is C.I.Pigment Blue 15:6. The filter has a hologram layer 27 having optical characteristics with selective reflection depending on the wavelength.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In a liquid crystal display device, a liquid crystal layer sandwiched between two polarizing plates passes through a first polarizing plate by adjusting a voltage applied to an electrode provided between the layers for each pixel. Controlling the degree of polarization of light from the backlight unit
Display is performed by controlling the amount of light passing 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 liquid crystal display.

There are various types of color filters for display devices, and here, color filters for liquid crystal display devices will be described as representative examples. 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 widely used for color display of liquid crystal display devices, and are important components that determine the color characteristics of liquid crystal display devices, which are finely patterned in various shapes to display high-definition images. Is used. As a conventional method for manufacturing a color filter, for example, a dyeing method, an inkjet method, a printing method, a photoresist method, an etching method, and the like are known.

In the photoresist method, a coloring liquid containing a coloring agent and a polymer conjugate is used. The coating solution is coated on a substrate, formed into a film, and then the colored layer is exposed to light and developed 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. Further, it is possible to produce a high-definition color filter having a high resolution and difficult by a printing method or an ink-jet method, and this method has become a mainstream method in recent years in the production of a color filter for a liquid crystal display device. .

[0005] As a backlight unit, a backlight unit using a three-wavelength-band fluorescent lamp (hereinafter referred to as a "three-wave tube") having excellent color rendering properties as a light source is widely used. The backlight unit includes a three-wavelength tube and members such as a light guide plate and a diffusion plate.
It refers to a unit that produces light incident on the second polarizing plate. With the advent of these high-definition color filters and high color rendering three-wavelength tubes, color liquid crystal displays have formed a large market for monitors for liquid crystal color televisions, car navigation systems, and notebook computers with integrated liquid crystal displays. I have. 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.

In a color television, the shape, movement, and hue of a subject are reproduced on a receiving screen by a process in which the subject is photographed by a color camera, transmitted, and the transmitted signal is projected on a receiver. . And
The transmission method of the image signal including the hue is standardized.
A typical example of this system is NTSC (National
Television System Committ
ee), with the United States, Canada and Japan being the major countries broadcasting in this format. On the other hand, in Europe, EBU (European Broadcast
ing Union: European Broadcasting Union). What determines the reproducibility range of the color television is the chromaticity of the three primary colors (the three primary colors of the image) of the receiver, and the spectral characteristics that the color camera should have are also determined by this.
In the standards of the transmission methods as described above, the chromaticity of each of the three primary colors is defined. Therefore, the required chromaticity differs depending on the standard.

[0008]

In order to achieve the excellent chromaticity required for the liquid crystal display device, ideally, the red, green, and blue light emitted discontinuously as shown in FIG. It is desired to realize a backlight unit that emits light and a color filter that transmits red, green, and blue light emission in a rectangular shape as shown in FIG. However, the emission intensity spectrum of a practically used backlight unit is shown in FIG.
It has a continuous distribution as shown in 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 having excellent chromaticity with light obtained by dispersing light emitted from the backlight unit using a color filter.

As shown in FIG. 3, the emission intensity spectrum of a practically used backlight unit is generally 47
0 nm to around 520 nm, and 570 nm to 600
It often has an undesirably strong luminescence intensity near nm. It is necessary for a liquid crystal display device having excellent display quality to suppress light emission of such a portion that does not exist in the light emission intensity of the ideal backlight unit shown in FIG.

Therefore, an object of the present invention is to provide an excellent chromaticity, which is difficult to achieve with the current dyes, by the specific dyes among the current dyes and by suppressing strong light emission at the above-mentioned undesired portions of the backlight unit. An object of the present invention is to provide a color filter that enables a liquid crystal display device having the same and a liquid crystal display device including the same.

[0011]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, the coloring layer of the color filter has a coloring matter of an oil-soluble dye, a disperse dye, or a basic dye. And a mixture of a dye containing at least one of them and a copper phthalocyanine pigment, wherein the mixing ratio of the dye to the copper phthalocyanine pigment is 10% by weight to 90% by weight to 50% by weight.
0% by weight, and 80% by weight or more of the copper phthalocyanine pigment is C.I. I. Pigment Blue 15: 6, which is a colored layer formed by using a colored composition, and further has an optical property of reflecting light of a selected wavelength, that is, a hologram film having an optical property of suppressing strong light emission in the undesired portion. The present inventors have found that a liquid crystal display device having excellent chromaticity can be obtained by using the provided color filter, and have reached 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 dry plate is placed at a position where it can receive the total reflected light therefrom. The recording medium is directly irradiated with another coherent laser beam in addition to the reflected light from the object without hitting the object. The light reflected from the object is referred to as object light, and the light directly illuminating the recording medium is referred to as reference light, and interference fringes between the reference light and the object 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 making the reference light and the target light incident on 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. Transmission holograms are disclosed, for example, in U.S. Pat. No. 3,506,327 and U.S. Pat.
It can be obtained by a known method as disclosed in, for example, 894,787. The reflection hologram can be produced by a known method disclosed in, for example, US Pat. No. 3,532,406. Among them, the reflection hologram has a characteristic of selectively reflecting only the light used for exposure, and when manufactured using a laser beam or the like, it selectively reflects light with a narrow half-value 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 in which two or more colored layers having different spectral characteristics are arranged adjacently on the same substrate.
The coloring layer is composed of a mixture of a dye containing at least one of an oil-soluble dye, a disperse dye, and a basic dye, and a copper phthalocyanine pigment, and the mixing ratio of the dye and the copper phthalocyanine pigment is 10% by weight. : 90% to 50% by weight: 80% by weight or more of the copper phthalocyanine pigment. I. Pigment Blue 15:
A colored layer formed using the colored composition that is No. 6,
The color filter further includes a hologram film having an optical characteristic of reflecting a selected wavelength.

According to a second aspect of the present invention, in the color filter according to the first aspect, the hologram film has a half-value width of reflected light of a selected wavelength reflected by 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, there is provided the color filter according to the first or second aspect, wherein the selected wavelength reflection of the hologram film is a regular reflection. Therefore, 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. There is a possibility of affecting the brightness of the image. If the selected wavelength reflection is specular reflection, there is no such fear.

According to a fourth aspect of the present invention, there is provided the color filter according to any one of the first to third aspects, wherein the hologram film has a maximum reflection wavelength of the selected wavelength reflection light of 470 nm to 520 nm. Is a color filter characterized by the following. For this reason, the backlight unit which is put into practical use generally has 470
It is possible to suppress light having a strong emission intensity from about nm to 520 nm.

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 reflected by the hologram film is from 570 nm to 600 nm. Is a color filter characterized by the following. Therefore, the backlight unit which is put into practical use generally has 570
It is possible to suppress light having a strong emission intensity from about nm to 600 nm.

According to a sixth 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 selected wavelength reflection light of the hologram film is 470 nm to 520 nm. , And 570 nm
From 600 nm to 600 nm. Therefore, a backlight unit that is practically used generally has 470 nm to 520 nm,
In addition, it is possible to suppress light having a strong light emission intensity around 570 nm to 600 nm.

According to a seventh aspect of the present invention, there is provided a liquid crystal display device comprising the color filter according to any one of the first to sixth aspects.

[0021]

Embodiments of the present invention will be described below in detail. 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 film formed in advance may be bonded to a substrate on which a color filter is formed. In addition, when used in a liquid crystal display device using a TFT as a driving element, an ITO film is formed on a color filter.
Although a (transparent conductive film) is formed or a polyimide alignment film is provided, a hologram film may be bonded after all of these series of steps are completed.

As the copper phthalocyanine pigment constituting the coloring composition used for forming the colored layer of the color filter according to the present invention, a crystalline copper phthalocyanine pigment such as α-type, β-type, and ε-type can be used. Among them, ε-type copper phthalocyanine (CI Pigment Blue 15: 6) is preferably used because the maximum transmission wavelength is the shortest wavelength. C. I. Pigment Blue
If the ratio of 15: 6 is less than 80% by weight of the copper phthalocyanine pigment, the y value of the chromaticity increases and the color becomes greenish.

The dyes constituting the coloring composition include:
It contains at least one of oil-soluble dyes, disperse dyes and basic dyes, and may be used alone or in combination of two or three. Specific examples include oil-soluble dyes, disperse dyes, and basic dyes described in the color index. For example, oil-soluble dyes include C.I.
I. Solvent Blue 2, 5, 25, 44,
49, 73, C.I. I. Solvent Violet
13. Disperse dyes include C.I. I. Disperse V
iolet 26, 28, basic dyes such as C.I.
I. Basic Violet 3, 14, 25, C.I.
I. Basic Blue 1, 5, 7, 26 and the like. The dyes exemplified above may be used alone or in combination of two or more. When added to the blue pigment, it functions to reduce the y value without increasing the film thickness.

In the present invention, the mixing ratio of the dye and the pigment is 10
Weight: used in the range of 90 weight to 50 weight: 50 weight. Preferably, it is used in an amount of 20 weight: 80 weight to 40 weight: 60 weight. If the mixing ratio of the dye is less than 10 weight, the film thickness becomes large, and if it exceeds 50 weight, heat resistance and light resistance are reduced.

The above coloring composition can be produced by adding a dye to a finely dispersed copper phthalocyanine pigment in a transparent resin by a known method so as to have the above-mentioned mixing ratio, and stirring and dissolving it.

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.

Examples of the resin include a thermoplastic resin, a thermosetting resin, a photosensitive resin, and a monomer or oligomer which forms a coating film similar to the resin when cured by irradiation with radiation, and these may be used alone or in combination of two or more. Can be used. When the coloring composition is cured by ultraviolet irradiation, a photoinitiator, a solvent and the like are added to the coloring composition so as to form a coating on a glass substrate so as to have a dry film thickness of 1 to 2 μm. Is done.

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.
Acrylate, polyethylene glycol di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, tricyclodecanyl (meth) acrylate, melamine (meth) acrylate, epoxy (meth) acrylate And various acrylates and methacrylates, (meth) acrylic acid, styrene, vinyl acetate, (meth) acrylamide, N-hydroxymethyl (meth) acrylamide, acrylonitrile and the like.

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 hexafluorophosphone
And tri (4-ethoxyphenyl) sulfonium tetrafluoroborate.

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

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

[0037]

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[0038]

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[0039]

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[0040]

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Specific examples of the photoradical generator include te
rt-butyl peroxy-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-propylhydroperoxide, 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 (te
rt-butylperoxycarbonyl) benzophenone,
3,3 ′, 4,4′-tetra (tert-amylperoxycarbonyl) benzophenone, 3,3 ′, 4,4′-tetra (tert-hexylperoxycarbonyl) benzophenone, 3,3′-bis (tert-butyl) Peroxycarbonyl) -4,4'-dicarboxybenzophenone, tert-butylperoxybenzoate, di-
Organic peroxides such as tert-butyl diperoxyisophthalate; and 9,10-anthraquinone, 1-chloroanthraquinone, 2-chloroanthraquinone, octamethylanthraquinone, and 1,2-benzanthraquinone. Examples thereof include quinones and benzoin derivatives such as benzoin methyl, benzoin ethyl ether, α-methyl benzoin and α-phenyl benzoin.

The color filter according to the present invention is, for example,
It is formed by red, green and blue pixels.

When the red pixel is composed of a pigment using a pigment, the pigment used for the red pixel may be C.I. I. P
Pigment Red 254 and C.I. I. Pigmen
and mixtures of tRed 177. Similarly, pigments used for green pixels include C.I. I. Pigmen
t Green 36 and C.I. I. Pigment Yel
low 150 or C.I. I. Pigment Yel
and low 139.

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 applied 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, drying is required after application on the substrate. Solvents that can be used when preparing the coloring composition, the substrate to be applied is dissolved,
Any material that is not affected by swelling, turbidity, erosion, etc. may be used. Incidentally, specific examples of the solvent include 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 include ethyl acetate, 2-phenoxyethanol, and diethylene glycol dimethyl ether, but are not limited thereto, and any solvent that satisfies 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 property of reflecting a selected wavelength is basically composed of a component (A): a resin which is soluble in a solvent and is solid at normal temperature and normal pressure, and a component (B): a liquid which is solid at normal temperature and normal pressure. And at least one radically polymerizable ethylenically unsaturated bond having a boiling point of 100 ° C. or higher at normal pressure and having a refractive index different from that of the component (A), and a component (C): A photoinitiator that produces an active species that promotes polymerization of the polymerizable monomer by actinic radiation,
Component (D): After dissolving a photoinitiator of component (C) with a sensitizing dye that sensitizes the photoinitiator to visible light in a solvent to form a film, a reference light of coherent actinic radiation is formed in the film (recording medium). When,
It can be manufactured by injecting the same radiation as the target light to generate an interference pattern.

Component (A): Resins soluble in a solvent and solid at normal temperature and pressure include 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, methylcellulose, ethylcellulose, chlorinated polyethylene, chlorinated polypropylene, poly-N-vinylcarbazole, poly-N-vinylpyrrolidone, polyacetic acid / vinyl acrylate , Copolymers composed of polyacetic acid / vinyl methacrylate, ethylene / vinyl acetate copolymer and copolymerizable monomers such as styrene, maleic anhydride, acrylic acid, methacrylic acid, acrylate, methacrylate, acrylamide, methacrylamide, etc. Thermoplastic resins such as polymers, bisphenol A, bisphenol AD, bisphenol B, bisphenol AF, bisphenol S, nopolak, o
-Cresol novolak, thermosetting resins typified by an epoxy resin produced by a condensation reaction of various phenol compounds such as p-alkylphenol novolak and epichlorohydrin, but are not limited thereto. Absent. In addition, these solvents are soluble at room temperature,
Two or more kinds of thermoplastic resins and thermosetting resins which are solid at normal pressure may be used as needed.

Component (B): 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; As polymerizable monomers having different refractive indices, 1
It contains a polyfunctional vinyl monomer in addition to a functional vinyl monomer, and may be a mixture thereof. Actually, according to Kogelnik's theory, it is desirable that the difference in the refractive index between the components (A) and (B) is 0.03 or more. 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,
Di- or poly (meta) such as pentaerythritol, dipentaerythritol, sorbitol, mannitol
Alicyclic monomers such as acrylates, dimethylol tricyclodecane monoacrylate and dimethylol tricyclodecane diacrylate, and aromatic polyhydroxy compounds, for example, di or poly such as hydroquinone, resorcin, catechol, pyrogallol, and bisphenol A (Meth) acrylic acid ester, ethylene oxide-modified (meth) acrylic acid ester of isocyanuric acid and the like, 2-phenoxyethyl acrylate, 2-phenoxyethyl methacrylate, phenol ethoxylate monoacrylate, p-chlorophenyl acrylate, KAY
ARAD-R551 (trade name, manufactured by Nippon Kayaku Co., Ltd.) and the like.

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, component (A): a resin soluble in a solvent and solid at normal temperature and normal pressure, and component (B): liquid at normal temperature and normal pressure and boiling point at normal pressure Has at least one radically polymerizable ethylenically unsaturated bond having a temperature of 100 ° C. or higher, and the component (A)
And a polymerizable monomer having a different refractive index are problematic, and some of them are already described in US Pat.
No. 42,112, U.S. Pat. No. 5,098,803, JP-A-2-3081, JP-A-2-3082,
JP-A-5-107999, JP-A-5-94014
JP, JP-A-7-261640, JP-A-8-4
No. 4277, for example.

As a light source suitable for hologram recording, any coherent light can be used. Generally, a helium-cadmium laser, an algo laser, a YA
G laser, helium-neon laser, krypton laser can be used

On the other hand, the liquid crystal display device according to 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,
On the other transparent plate, a counter pixel electrode is provided on the color filter side. 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. The liquid crystal display device shown in FIG. 5 includes a pair of transparent substrates 11, 2 such as glass substrates.
The liquid crystal 29 is sealed between the two. As the liquid crystal, a twisted nematic liquid crystal (TN) or a super twisted nematic liquid crystal (STN) is usually 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, a pixel electrode 12 is formed on the lower surface of the transparent substrate 11, 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 2
Black matrix (light shielding pattern) on the lower surface of 1
A coloring layer 22 including a red coloring layer 221, a green coloring layer 222, and a blue coloring layer 223 is provided via 23. The hologram film 2 is placed on the colored layer via an adhesive.
7 are provided, and constitute the color filter 28 of the present invention. Further, a counter electrode 24 is provided, on which an alignment film 25 that has been subjected to an alignment process in the same manner as the alignment film 13 is provided. On the upper surface of the transparent substrate 21, a polarizing plate 26 is provided. A backlight unit (not shown) is provided below the polarizing plate 14.

[0055]

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.

Example 1 A blue, green and red coloring composition for producing a color filter was prepared as follows. The acrylic varnish has a monomer composition of styrene /
A methacrylic acid / methyl methacrylate / butyl methacrylate = 20/20/30/30 (weight ratio) and a 20% by weight cyclohexanone solution of an acrylic resin having a molecular weight of about 40,000 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 (manufactured by Toyo Ink Mfg. Co., Ltd.) “Rionol Blue ES” 60 parts Dispersant (manufactured by Zeneca Corporation) “Solspers 20000” 6 parts Acrylic varnish 200 parts Cyclohexanone 134 parts

(Blue colored composition) 15.11 parts of the above copper phthalocyanine dispersion, 0.62 of a dye (AISEN SBN BLUE-701 manufactured by Hodogaya Chemical Co., Ltd.)
Parts, acrylic varnish 20.62 parts, dipentaerythritol hexaacrylate 3.39 parts, photoinitiator (Circa Geigy “Irgacure 907”) 1.35
And 53.31 parts of cyclohexanone, and stirred well to obtain a colored composition.

(Green-colored composition) The green-colored composition was prepared in the same manner as the blue-colored composition so that the compositions would be 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 Corporation “Sol Spers 20000”) 2 parts Acrylic varnish 102 parts Trimethylolpropane triacrylate 14 parts (Shinnakamura Chemical ( "NK Ester ATMPT" manufactured by K.K.) 4 parts Photosensitizer ("IRGACURE 907" manufactured by Ciba Geigy) 2 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 such 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 (“Sol Spers 20000” manufactured by Zeneca Corporation) 2 parts Acrylic varnish 108 parts Trimethylolpropane triacrylate 13 parts (manufactured by Shin-Nakamura Chemical Co., Ltd.) NK ester 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, 3 '
-Carbonylbis (7-diethylaminocoumarin)
A solution obtained by mixing and dissolving 25 parts by weight of 2-butanone in 160 parts by weight was used as a photosensitive solution. The photosensitive solution is made of 100 μm thick PET.
The film was applied on the film so that the film thickness after drying was about 15 μm, and then dried in an oven at 80 ° C. for 10 minutes to produce a hologram recording medium.

The hologram recording medium is bonded to an aluminum-deposited optical mirror through 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 hologram film 1 thus manufactured. The maximum reflection wavelength was 488 nm, and the reflection at the selected wavelength was specular reflection. Further, the half width of the selected wavelength reflection was about 13 nm.

(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 hologram film 2 thus manufactured. The maximum reflection wavelength was 585 nm, and the reflection at the selected wavelength was specular reflection. Further, the half width of the selected wavelength reflection was about 13 nm.

(Hologram Film 3) A hologram film 3 was obtained by laminating the hologram film 1 and the hologram film 2 using an optical adhesive (HJ-9150W, manufactured by Nitto Denko Corporation). 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 is exposed to a stripe pattern using an exposure machine, developed with an alkali developing solution for 90 seconds, and then heated in an oven at 200 ° C. for 30 minutes to remove the remaining polymerizable functional groups. The reaction was completed 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 Corporation, Perylenex 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 is exposed to a position shifted from the red colored layer by an exposure machine, developed, and heated at 200 ° C. for 30 minutes to form a green colored layer adjacent to the red colored layer. Obtained.

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

The shape of the colored layer of each color was good, and the resolution was also good. Now, red on the transparent substrate,
A color filter having three colored layers of green and blue was obtained.

The hologram film 1 is coated on the 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 to obtain a color filter 2 with a hologram.

(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 1 (Color Filter 4) As a comparison, a color filter having three colored layers of red, blue and green on a glass substrate in the same manner as the color filter 1 except that the hologram film was not bonded. 4 was produced.

The color filter 1 manufactured as described above,
A liquid crystal display device was assembled using the color filter 2, the color filter 3, and the color filter 4 of Comparative Example 1, and the results of evaluation using a backlight unit having an emission intensity spectrum as shown in FIG. 9 are summarized in Table 1. Show.

[0074]

[Table 1]

[0075]

The color filter according to the present invention has a coloring layer using a specific dye and a hologram film having an optical characteristic for suppressing strong light emission in an undesired portion of the backlight unit, so that it is difficult to realize with the current dye. It becomes a color filter that enables a liquid crystal display device having excellent chromaticity. In addition, a liquid crystal display device provided with this color filter is a liquid crystal display device having excellent chromaticity, which is difficult to achieve with current dyes.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an emission intensity spectrum of an ideal backlight unit.

FIG. 2 is an explanatory diagram of a spectrum spectrum of an ideal color filter.

FIG. 3 is an explanatory diagram of an example of an emission intensity spectrum of a backlight unit that is put into practical use.

FIG. 4 is an explanatory diagram of an example of a spectral spectrum of a color filter that is put into practical use.

FIG. 5 is a sectional view showing an example of a liquid crystal display device according to the present invention.

FIG. 6 is an explanatory diagram of spectral characteristics of the hologram film 1.

FIG. 7 is an explanatory diagram of spectral characteristics of the hologram film 2.

FIG. 8 is an explanatory diagram of spectral characteristics of the hologram film 3.

FIG. 9 is an explanatory diagram of an emission intensity spectrum 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 ... Coloring layer 221 ... Red pixel (red coloring layer) 222 ... Green pixel (green coloring layer) 223 ... Blue pixel (blue colored layer) 23 ... Light shielding pattern 24 ... Counter electrode 25 ... Orientation film 26 ... Polarizing plate 27 ... Hologram film having optical characteristics of selective wavelength reflection 28 ... Color filter according to the present invention 29 ... Liquid crystal

Continuing from the front page (72) Inventor Hidetoshi Hagiwara 1-5-1, Taito, Taito-ku, Tokyo Letterpress Printing Co., Ltd. (72) Inventor Tadashi Hosono 1-1-1 Taito, Taito-ku, Tokyo Letterpress printing In-house F-term (reference) 2H025 AA00 AB13 AC01 AD01 BC42 CA00 CC12 CC13 DA40 FA03 FA04 FA17 FA29 2H048 BA01 BA02 BA27 BA45 BA47 BA48 BA64 BB02 BB08 BB10 BB42 2H049 CA01 CA05 CA08 CA09 CA22 2H091 FA02Y FC41 LA10 FC02

Claims (7)

[Claims] 1. A color filter in which two or more colored layers having different spectral characteristics are arranged adjacently on the same substrate, wherein the colored layer is composed of an oil-soluble dye, a disperse dye,
A mixture of a dye containing at least one basic dye and a copper phthalocyanine pigment, wherein the mixing ratio of the dye and the copper phthalocyanine pigment is 10% by weight to 90% by weight to 50% by weight; 80% by weight or more of C.I. I. Pigment Blue 1
A color filter, which is a colored layer formed by using a colored composition of 5: 6, and further includes a hologram film having optical characteristics of reflecting a selected wavelength. 2. The color filter according to claim 1, wherein the hologram film has a half-value width of reflected light of the selected wavelength reflection of 30 nm or less. 3. The color filter according to claim 1, wherein said selected wavelength reflection of said 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 reflected by said hologram film is 470 nm to 520 nm. 5. The color filter according to claim 1, wherein a maximum reflection wavelength of the reflected light of the selected wavelength reflected by the hologram film is from 570 nm to 600 nm. 6. The maximum reflection wavelength of reflected light of the selected wavelength reflected by the hologram film is 470 nm to 520 nm, and 57
2. The structure according to claim 1, wherein the thickness is from 0 nm to 600 nm.
The color filter according to claim 3. 7. A liquid crystal display device comprising the color filter according to claim 1. Description: