JP2003004934A - Resin composition for color filter and color filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color filter which can definitely prevent display failure in a liquid crystal display device and to provide a resin composition which enables manufacturing the above color filter with a wide selection range for the structural materials to be used without increasing the cost. SOLUTION: The resin composition for a color filter contains a film forming resin composition (V) and a solvent and further contains a pigment (P) by 0 to 0.3 weight ratio (P/V) to the film forming resin component (V). The resin composition has such property that when the molded resin member is treated by forced extraction of impurities in a contact state with a liquid crystal, the holding rate of a voltage applied on the liquid crystal through the resin member is >=80%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition for a color filter and a color filter, and more particularly to a color filter which enables a liquid crystal display device having excellent display quality, and to manufacture such a color filter. Of the resin composition.

[0002]

2. Description of the Related Art In recent years, color liquid crystal display devices have been attracting attention as flat displays. As an example of a color liquid crystal display device, a black matrix, a coloring layer formed of a plurality of colors (usually, three primary colors of red (R), green (G), and blue (B)), a common transparent electrode layer, and an alignment layer are provided. A transmissive liquid crystal in which a color filter and a counter electrode substrate including a thin film transistor (TFT element), a pixel electrode and an alignment layer are opposed to each other with a predetermined gap, and a liquid crystal material is injected into the gap to form a liquid crystal layer. There is a display device. There is also a reflective liquid crystal display device in which a reflective layer is provided between the color filter substrate and the colored layer.

In such a liquid crystal display device, the presence of impurities in the liquid crystal lowers the electric resistance of the liquid crystal display device,
Light transmittance-electrical characteristics are shifted, and display unevenness occurs. Display unevenness is a phenomenon in which a region having different contrast and chromaticity is formed on a part of the screen, and has become a very important problem for the reliability of the liquid crystal display device. As a technique considering such a display defect phenomenon, a technique relating to ionic impurities in a material composition (Japanese Patent Laid-Open No. 1-254918).
No.), a technique relating to chlorine ions and nitrate ions in the material composition (JP-A-11-64619), and a technique relating to the amount of water generated from the color filter (JP-A-11-13322).
3) etc.

[0004]

However, in the prior art, since the impurities and constituent materials to be treated are limited, when impurities other than these are present,
When impurities are mixed in other constituent materials, there is a problem that a display defect of the color liquid crystal display device eventually occurs. Further, in the resin composition used for manufacturing the color filter, the type of constituent material, the manufacturer,
The type and amount of impurities differ depending on the product name, etc., and it was difficult to predict the effect on the display characteristics of the color liquid crystal display device when the constituent material is changed. Furthermore, it is difficult to specify all the substances that cause the display failure phenomenon of the color liquid crystal display device, and even if it can be specified, when using a resin composition containing no causative substance in the constituent materials, use The width of possible constituent materials is significantly limited, and
There is a problem that the production cost of the resin composition increases.

The present invention has been made in view of the above circumstances, and a color filter capable of surely preventing a display defect phenomenon of a liquid crystal display device, and a wide selection range of constituent materials to be used, resulting in an increase in cost. It is an object of the present invention to provide a resin composition that enables the production of the above-mentioned color filter without causing it.

[0006]

A color filter is used in a liquid crystal display device in which a common transparent electrode layer and an alignment layer are provided on a resin colored layer. In this case, the resin colored layer is used as a resin member. On the other hand, it is the nearest position. Therefore, the present invention considers a resin member constituting a color filter that is in contact with a liquid crystal layer of a liquid crystal display device as one of the sources of impurities,
As characteristics that are correlated with display defects due to impurities that have migrated from the resin member to the liquid crystal layer, the weight ratio of the pigment and the film-forming resin component in the resin composition for the color filter, and the resin member in contact with the liquid crystal This is done by paying attention to the holding ratio of the voltage applied to the liquid crystal through the resin member after the forced impurity extraction treatment.

That is, in order to achieve the above object, the resin composition for a color filter of the present invention contains a film-forming resin component (V) and a solvent, and at the same time forms the film-forming resin component (V). V) weight ratio (P / V) is 0
When the resin member containing the pigment (P) so as to be in the range of 0.3 is subjected to the forced impurity extraction treatment in a state of being in contact with the liquid crystal, the liquid crystal is passed through the resin member. The applied voltage is held at a rate of 80% or more.

Further, the color filter of the present invention comprises a transparent substrate and a colored layer having a colored pattern of a plurality of colors provided on the transparent substrate, the colored layer comprising the resin composition for a color filter described above. It was configured to be formed by using. Further, the color filter of the present invention includes a transparent substrate, a colored layer formed of a colored pattern of a plurality of colors provided on the transparent substrate, and a transparent protective layer formed so as to cover the colored layer, The protective layer is formed by using the resin composition for the color filter described above, and the transparent columnar protrusions are formed at a plurality of predetermined portions on the transparent substrate and project from the protective layer. And the columnar protrusions are formed by using the resin composition for the color filter described above.

Further, the color filter of the present invention comprises a substrate, a drive element layer and a reflective electrode layer which are sequentially laminated on the substrate, and a colored layer which is provided on the reflective electrode layer and has a colored pattern of a plurality of colors. The colored layer is formed by using the resin composition for a color filter according to claim 1.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The best embodiment of the present invention will be described below.

Resin Composition for Color Filter The resin composition for color filter of the present invention contains a pigment, a film-forming resin component and a solvent, and the weight ratio of the pigment and the film-forming resin component (P / V). ) Is in the range of 0 to 0.3, and the voltage applied to the liquid crystal through the resin member when the resin member formed is subjected to the forced impurity extraction treatment in a state of being in contact with the liquid crystal. Of 80% or more, preferably 90% or more.

Here, the film-forming resin component is a component obtained by removing the solvent and the pigment from the resin composition, and examples thereof include a monomer, a polymer, a dispersant, a polymerization initiator and an additive. When the above weight ratio (P / V) exceeds 0.3, impurities migrate from the formed resin member into the liquid crystal layer, causing a display defect phenomenon of the liquid crystal display device.

In the present invention, the above-mentioned impurity forced extraction treatment,
The voltage holding ratio shall be measured as follows. (Forced Impurity Extraction Process) As shown in FIG. 1, a pair of ITO substrates 11 and 14 provided with ITO (indium tin oxide) electrodes 13 and 16 on the surfaces of glass substrates 12 and 15 are prepared. On the ITO electrode 13 of No. 11, a resin member 17 is formed by using the resin composition of the present invention, and then the other ITO substrate 14 is opposed so that the distance between the ITO electrodes is in the range of 5 to 15 μm, and the periphery thereof. The part is sealed with a seal member 19, and a liquid crystal 18 is sealed between both ITO substrates to produce a measuring liquid crystal cell 10. This resin member 17
Is to be formed under the same conditions as in the case of producing a color filter using the resin composition of the present invention, and when a treatment step such as pre-baking or post-baking is required, the treatment is performed under predetermined conditions . Further, the liquid crystal 18 to be used is a liquid crystal having a voltage holding ratio of 95% or more measured by the above-mentioned measuring liquid crystal cell 10 under the following voltage holding ratio measuring condition in the state before the forced impurity extraction process. Next, the measurement liquid crystal cell 10 is heat-treated together (leaved in an oven at 105 ° C. for 2.5 hours), and the resin member 17 is subjected to the forced impurity extraction treatment.

(Conditions for Measuring Voltage Holding Ratio) The liquid crystal cell 10 for measurement which has been subjected to the forced impurity extraction treatment as described above is returned to room temperature, and the voltage holding ratio is measured under the following conditions. -ITO electrode distance: 5 to 15 m-Applied voltage pulse amplitude: 10 V-Applied voltage pulse frequency: 60 Hz-Applied voltage pulse width: 16.67 msec

Next, constituent components of the resin composition for a color filter of the present invention will be described. As described above, the resin composition for a color filter of the present invention is a resin composition containing a pigment, a film-forming resin component and a solvent. Examples of pigments that can be used in the resin composition of the present invention include known red pigments, yellow pigments, green pigments, blue pigments, purple pigments, black pigments and the like. When displaying concrete examples of pigments by color index numbers, the red pigment is PR1.
77, PR48: 1, PR254, yellow pigment is PY8
3, PY138, PY139, PY150, green pigments are PG7 and PG36, blue pigments are PB15 series, PB
1, PB19, PB60, PB61, purple pigment is PV
23, black pigment is carbon black, metal oxide-based black pigment (titanium black, Cu, Fe, Mn, V, Ni
Pigments containing oxides such as) and the like. As described above, the content of such a pigment is such that the weight ratio (P / V) of the pigment to the film-forming resin component is in the range of 0 to 0.3.

As the monomer contained as the film-forming resin component constituting the resin composition of the present invention, a compound having at least one polymerizable carbon-carbon unsaturated bond can be used. Specifically, allyl acrylate, benzyl acrylate, butoxyethyl acrylate, butoxyethylene glycol acrylate, cyclohexyl acrylate, dicyclopentanyl acrylate, 2-ethylhexyl acrylate, glycerol acrylate, glycidyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl. Acrylate, isobonyl acrylate, isodexyl acrylate, isooctyl acrylate, lauryl acrylate, 2-methoxyethyl acrylate, methoxyethylene glycol acrylate, phenoxyethyl acrylate, stearyl acrylate, ethylene glycol diacrylate, diethylene glycol diacrylate, 1,4-butane Diol diacrylate, , 5-
Pentanediol diacrylate, 1,6-hexanediol diacrylate, 1,3-propanediol acrylate, 1,4-cyclohexanediol diacrylate, 2,2-dimethylolpropane diacrylate,
Glycerol diacrylate, tripropylene glycol diacrylate, glycerol triacrylate, trimethylolpropane triacrylate, polyoxyethylated trimethylolpropane triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, triethylene glycol diacrylate, polyoxypropyl triacrylate Methylolpropane triacrylate, butylene glycol diacrylate, 1,2,4-butanetriol triacrylate,
2,2,4-trimethyl-1,3-pentanediol diacrylate, diallyl fumarate, 1,10-decanediol dimethyl acrylate, dipentaerythritol hexaacrylate, and the above acrylate group substituted with a methacrylate group, γ-methacryloxypropyltrimethoxysilane, 1-vinyl-2-pyrrolidone, 2-hydroxyethylacryloyl phosphate, tetrahydrofurfryl acrylate, dicyclopentenyl acrylate, dicyclopentenyloxyethyl acrylate, 3-butanediol diacrylate, neo Pentyl glycol diacrylate, polyethylene glycol diacrylate, hydroxypivalate neopentyl glycol diacrylate, phenol-ethylene ester Side-modified acrylate, phenol-propylene oxide-modified acrylate, N-vinyl-2-pyrrolidone, bisphenol A-ethylene oxide-modified diacrylate, pentaerythritol diacrylate monostearate, tetraethylene glycol diacrylate, polypropylene glycol diacrylate, trimethylolpropane Acrylate monomers such as propylene oxide modified triacrylate, isocyanuric acid ethylene oxide modified triacrylate, trimethylolpropane ethylene oxide modified triacrylate, pentaerythritol pentaacrylate, pentaerythritol hexaacrylate, pentaerythritol tetraacrylate, and acrylate groups thereof. Placed on the methacrylate base Substituents, urethane acrylate oligomer in which acrylate group is bound to oligomer having polyurethane structure, polyester acrylate oligomer in which acrylate group is bound to oligomer having polyester structure, epoxy acrylate in which acrylate group is bound to oligomer having epoxy group Oligomer, urethane methacrylate oligomer in which methacrylate group is bound to oligomer having polyurethane structure, polyester methacrylate oligomer in which methacrylate group is bound to oligomer having polyester structure, epoxy methacrylate oligomer in which methacrylate group is bound to oligomer having epoxy group, Polyurethane acrylate having acrylate group, polyester having acrylate group Acrylate, epoxy acrylate resin having an acrylate group, a polyurethane methacrylate having a methacrylate group, a polyester methacrylate having a methacrylate group, an epoxy methacrylate resins having a methacrylate group. These are examples of monomers that can be used and are not limited to these. The content of such a monomer is preferably in the range of 10 to 70% by weight, preferably 20 to 60% by weight of the film-forming resin component.

As the polymer contained as the film-forming resin component constituting the resin composition of the present invention, ethylene-vinyl acetate copolymer, ethylene-vinyl chloride copolymer, ethylene vinyl copolymer, polystyrene, acrylonitrile -Styrene copolymer, ABS resin, polymethacrylic acid resin, ethylene methacrylic acid resin, polyvinyl chloride resin, chlorinated vinyl chloride, polyvinyl alcohol, cellulose acetate propionate, cellulose acetate butyrate, nylon 6, nylon 66, nylon 12, polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polyvinyl acetal, polyether ether ketone, polyether sulfone, polyphenylene sulfide, polyarylate,
Polyvinyl butyral, epoxy resin, phenoxy resin, polyimide resin, polyamideimide resin, polyamic acid resin, polyetherimide resin, phenol resin, urea resin, etc., and polymerizable monomers such as methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl. Methacrylate, n-propyl acrylate, n-propyl methacrylate, isopropyl acrylate, isopropyl methacrylate, sec-butyl acrylate, sec-butyl methacrylate, isobutyl acrylate, isobutyl methacrylate, tert-butyl acrylate, tert-butyl methacrylate, n-
Pentyl acrylate, n-pentyl methacrylate,
n-hexyl acrylate, n-hexyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, n-octyl acrylate, n-
Octyl methacrylate, n-decyl acrylate, n
-Decyl methacrylate, styrene, α-methylstyrene, N-vinyl-2-pyrrolidone, glycidyl (meth)
Dimer of acrylic acid, methacrylic acid, and acrylic acid with one or more acrylates (for example, Toagosei Kagaku Co., Ltd.)
M-5600), itaconic acid, crotonic acid, maleic acid, fumaric acid, vinyl acetic acid, polymers or copolymers of one or more of these acid anhydrides, and the like. In addition, examples thereof include polymers obtained by adding an ethylenically unsaturated compound having a glycidyl group or a hydroxyl group to the above copolymers, but are not limited thereto.

Among the above polymers, from the viewpoint of compatibility with the monomers used together, polymethylmethacrylate resin, polyethylmethacrylate resin, polymethylmethacrylate resin and polyethylmethacrylate resin copolyester. A coalesce, a phenoxy resin, an epoxy resin, a polycarbonate resin, a polystyrene resin, a cellulose acetate propionate, a cellulose acetate butyrate, ethyl hydroxyethyl cellulose, a cellulose triacetate and the like can be preferably used. Particularly preferably, polymethylmethacrylate resin, polyethylmethacrylate resin, polystyrene resin, copolymer of methacrylic acid and styrene, glycidylmethacrylate copolymer, phenoxy resin, epoxy resin, and modified products thereof can be used. .

Particularly preferred epoxy resins as the polymer include Epicoat series manufactured by Mitsubishi Petrochemical Shell Co., Celoxide series manufactured by Daicel Co., Ltd., Epolide series, or bisphenol-A type epoxy resin and bisphenol-F. Type epoxy resin, bisphenol-S type epoxy resin, novolac type epoxy resin, polycarboxylic acid glycidyl ester, polyol glycidyl ester, aliphatic or alicyclic epoxy resin, amine epoxy resin, triphenolmethane type epoxy resin,
Examples thereof include a dihydroxybenzene type epoxy resin and a copolymerized epoxy compound of glycidyl (meth) acrylate and a radically polymerizable monomer. The content of such a polymer is desirably in the range of 20 to 80% by weight, preferably 30 to 70% by weight of the film forming resin component of the resin composition.

As the dispersant contained as the film-forming resin component constituting the resin composition of the present invention, a polymer dispersant such as modified polyurethane, modified polyacrylate, modified polyester, modified polyamide, phosphate ester, poly Surfactants such as ethers and alkylamines can be used. The content of such a dispersant is in the range of 5 to 60% by weight, preferably 10 to 50% by weight, based on the film forming resin component of the resin composition.

The polymerization initiator contained as the film-forming resin component constituting the resin composition of the present invention includes benzophenone, Michler's ketone, N, N 'tetramethyl-
4,4'-diaminobenzophenone, 4-methoxy-
Aromatic ketones such as 4'-dimethylaminobenzophenone, 4,4'-diethylaminobenzophenone, 2-ethylanthraquinone, phenanthrene, benzoin ethers such as benzoin methyl ether, benzoin ethyl ether, benzoin phenyl ether, methylbenzoin, ethylbenzoin, etc. Benzoin, 2- (o-
Chlorophenyl) -4,5-phenylimidazole dimer, 2- (o-chlorophenyl) -4,5-di (m-methoxyphenyl) imidazole dimer, 2- (o-fluorophenyl) -4,5- Diphenylimidazole dimer, 2- (o-methoxyphenyl) -4,5-diphenylimidazole dimer, 2,4,5-triarylimidazole dimer, 2-benzyl-2-dimethylamino-
1- (4-morpholinophenyl) -butanone, 2-trichloromethyl-5-styryl-1,3,4-oxadiazole, 2-trichloromethyl-5- (p-cyanostyryl) -1,3,4 -Oxadiazole, 2-trichloromethyl-5- (p-methoxystyryl) -1,3,
Halomethylthiazole compounds such as 4-oxadiazole, 2,4-bis (trichloromethyl) -6-p-methoxystyryl-S-triazine, 2,4-bis (trichloromethyl) -6- (1-p- Dimethylaminophenyl-1,3-butadienyl) -S-triazine, 2-trichloromethyl-4-amino-6-p-methoxystyryl-S-triazine, 2- (naphth-1-yl) -4,6
-Bis-trichloromethyl-S-triazine, 2- (4
-Ethoxy-naphth-1-yl) -4,6-bis-trichloromethyl-S-triazine, 2- (4-butoxy-
Naphth-1-yl) -4,6-bis-trichloromethyl-S-triazine and other halomethyl-S-triazine compounds, 2,2-dimethoxy-1,2-diphenylethan-1-one, 2-methyl- 1- [4- (methylthio) phenyl] -2-morpholinopropanone, 1,2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1,1-hydroxy-cyclohexyl-phenylketone , Irgacure 369 (manufactured by Ciba Specialty Chemicals), Irgacure 651
(Ciba Specialty Chemicals), Irgacure 907 (Ciba Specialty Chemicals) and other polymerization initiators. In the present invention, these polymerization initiators may be used alone or in combination of two or more. The addition amount of such a polymerization initiator is desirably in the range of 10 to 70% by weight, preferably 20 to 60% by weight of the film-forming resin component of the resin composition.

When a surfactant is contained as the film-forming resin component, the surfactant may be polyoxyethylene alkyl ether, sorbitan fatty acid ester,
Polyoxyethylene alkyl phenyl ether, linear alkyl benzene sulfonate, polyethylene glycol, etc. can be used. The content of such a surfactant is desirably in the range of 1 to 30% by weight, preferably 5 to 20% by weight of the film forming resin component of the resin composition.

Examples of the solvent constituting the resin composition of the present invention include alcohols such as methanol, ethanol, n-propanol, isopropanol, ethylene glycol and propylene glycol, terpenes such as α- or β-terpineol, and the like. Acetone, methyl ethyl ketone, cyclohexanone, N-methyl-2-pyrrolidone and other ketones, toluene, xylene, tetramethylbenzene and other aromatic hydrocarbons, cellosolve, methyl cellosolve, ethyl cellosolve, carbitol, methyl carbitol, ethyl carbyl Tall, butyl carbitol,
Glycol ethers such as propylene glycol monomethyl ether, propylene glycol monoethyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, ethyl acetate, butyl acetate, cellosolve acetate , Ethyl cellosolve acetate, butyl cellosolve acetate, carbitol acetate, ethyl carbitol acetate, butyl carbitol acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, and other acetic acid esters. By using the resin composition of the present invention as described above, a colored layer of a color filter, a black matrix (light-shielding layer), a protective layer, a gap retaining material (columnar convex portion), etc. can be formed.

Color Filter Next, the color filter of the present invention will be described. Figure 2
FIG. 3 is a schematic cross-sectional view showing an example of the color filter of the present invention. In FIG. 2, the color filter 21 is the transparent substrate 2
2, a black matrix 23 formed on the transparent substrate 22, and a coloring layer 24 (red pattern 24
R, green pattern 24G, and blue pattern 24B are arranged in a desired pattern shape. The colored layer 24 is formed by using the resin composition of the present invention.

When the color filter 21 is used in a liquid crystal display device, it is used in a state where a common transparent electrode layer or an alignment layer is provided on the colored layer 24. The thickness of such a common transparent electrode layer or alignment layer is used. Is as thin as 0.01 to 1 μm,
The effect of shielding impurities can hardly be expected. However, by forming the colored layer 24 using the resin composition of the present invention, it is possible to prevent the occurrence of display unevenness and to provide a liquid crystal display device having excellent display quality.

As the transparent substrate 22 constituting the above color filter 21, a transparent rigid material such as quartz glass, Pyrex (registered trademark) glass, synthetic quartz plate or the like which is not flexible, or a transparent resin film or an optical resin is used. A transparent transparent material having flexibility such as a plate can be used. Among them, 7059 glass manufactured by Corning Co., Ltd. is a material having a small coefficient of thermal expansion, is excellent in dimensional stability and workability in high temperature heat treatment, and is a non-alkali glass containing no alkali component in the glass. It is suitable as a color filter for color liquid crystal display devices.

The black matrix 23 of the color filter 21 is formed by forming a thin metal film of chromium or the like having a thickness of about 1000 to 2000 Å by a sputtering method, a vacuum deposition method or the like, and patterning this thin film.
Formed by forming a resin layer of polyimide resin, acrylic resin, epoxy resin or the like containing light shielding particles such as carbon fine particles and patterning this resin layer, light shielding particles such as carbon fine particles or metal oxides It may be any of those formed by forming the contained photosensitive resin layer and patterning this photosensitive resin layer.

FIG. 3 is a schematic sectional view showing another example of the color filter of the present invention. In FIG. 3, the color filter 31 includes a substrate 32, a black matrix 33 formed on the substrate 32, and a coloring layer 34 (red pattern 34R, green pattern 34G, blue pattern 34B).
Are arranged in a desired pattern shape), and a transparent protective layer 35 is formed so as to cover the black matrix 33 and the coloring layer 34. Further, the black matrix 33 is transparent at a predetermined plurality of locations. A gap holding material (columnar convex portion) 36 is formed so as to protrude from the protective layer 35.

The color filter 31 is used in a liquid crystal display device in which a common transparent electrode layer and an alignment layer are provided on the protective layer 35. In this case, the protective layer 35 and the gap retaining material 3 are used.
The position 6 comes into contact with the liquid crystal layer. Then, by forming at least the protective layer 35 and the gap retaining material 36 using the resin composition of the present invention, it is possible to prevent the occurrence of display unevenness and to provide a liquid crystal display device having excellent display quality.
The color filters 21 and 31 described above can be used in a transmissive liquid crystal display device and a reflective liquid crystal display device (a color filter is disposed on the viewer side with respect to the liquid crystal layer).

Next, an example of a color filter used in a reflection type liquid crystal display device in which a color filter is arranged on the side opposite to the viewer side through the liquid crystal layer will be described. FIG. 4 is a schematic sectional view showing an example of the color filter of the present invention as described above. In FIG. 4, the color filter 41 is a substrate 42.
And a driving element layer 43 provided on the substrate 42, and a reflective electrode layer 44, a coloring layer 46, and a transparent electrode layer 48 which are sequentially stacked on the driving element layer 43, and the coloring layer 46 is red. The pattern 46R, the green pattern 46G, and the blue pattern 46B are arranged in a desired pattern shape.

The color filter 41 includes a transparent electrode layer 4
8 is used in a liquid crystal display device with an alignment layer provided,
In this case, the colored layer 46 is the resin member that is closest to the liquid crystal layer, and by forming the colored layer 46 using the resin composition of the present invention, the occurrence of display unevenness is prevented and the display quality is improved. A liquid crystal display device having excellent characteristics can be realized.

Substrate 42 that constitutes color filter 41
Can use various glass substrates, metal substrates, resin substrates, composite substrates made of two or more of these materials, and the thickness thereof should be set appropriately in consideration of the application of the color filter 41. Can be made, for example, 0.3 to 10 mm
It can be a degree.

The driving element layer 43 constituting the color filter 41 is composed of a thin film transistor (TFT) formed in a predetermined pattern and electrodes of a drain, a source and a gate. The reflective electrode layer 44 is a pixel electrode connected to the drain electrode, is formed on the drive element layer 43 via an insulating layer, and is mirror-finished.
The reflective electrode layer 44 is made of aluminum, chrome, gold,
It is formed of a metal thin film such as silver or copper and has a thickness of 500 to 100.
It can be set in the range of 00Å, preferably 1000 to 3000Å. Such a reflective electrode layer 44 can be formed by a known thin film forming method such as a vapor deposition method, a sputtering method, a CVD method and an ion plating method.

[0034]

EXAMPLES Next, the present invention will be described in more detail by showing examples. [Example 1] Preparation of resin composition A resin composition G1 and a resin composition G2 having the following compositions were prepared. In each of the resin compositions G1 and G2, the pigment and the film-forming resin component (dispersant, monomer, polymer, polymerization initiator,
6 types (P / V) with different weight ratio (P / V) to total amount of additives)
/ V = 0, 0.1, 0.2, 0.3, 0.4, 0.6)
The resin composition of was prepared.

[0035] (Resin composition G1)     ・ Pigment (PG36) ... Appropriate amount     ・ Dispersant (Ajinomoto Co., Ltd., Addisper PB821) ...     ・ Monomer: 40 parts by weight       (Dipentaerythritol hexaacrylate)     -Polymer (styrene / acrylic acid copolymer) ... 60 parts by weight       (Copolymerization weight ratio = 80/20, weight average molecular weight = 20000)     ・ Photopolymerization initiator: 5 parts by weight       (Irgacure 907 manufactured by Ciba Specialty Chemicals)     ・ Solvent: 500 parts by weight       (Propylene glycol-1-monomethyl ether-2-acetate)

[0036] (Resin composition G2)     ・ Pigment (PG36) ... Appropriate amount     ・ Dispersant (Ajinomoto Co., Ltd., Addisper PB821) ...     ・ Monomer: 40 parts by weight       (Dipentaerythritol hexaacrylate)     -Polymer (styrene / acrylic acid copolymer) ... 100 parts by weight       (Copolymerization weight ratio = 80/20, weight average molecular weight = 20000)     ・ Photopolymerization initiator: 5 parts by weight       (Irgacure 907 manufactured by Ciba Specialty Chemicals)     ・ Solvent: 500 parts by weight       (Propylene glycol-1-monomethyl ether-2-acetate)

Impurity forced extraction of resin member for color filter
Output treatment test (1) Production of liquid crystal cell for measurement Low expansion non-alkali glass substrate (7059 glass manufactured by Corning Co., Ltd. 100 mm × 100) on which an ITO electrode was formed
mm, thickness 0.7 mm) was prepared and washed according to a standard method.

Next, each of the prepared 6 kinds of resin compositions of G1 and G2 was applied onto the ITO electrode of each glass substrate by a spin coating method, prebaked under the condition of 80 ° C. for 3 minutes, and then framed. -Shaped photomask exposed (150mJ /
cm ² ), spray development using a 0.05% KOH aqueous solution was performed for 60 seconds, and then post-baking was performed at 230 ° C. for 20 minutes to form a resin member having a thickness of 1.5 μm on the ITO electrode. .

On the other hand, as a counter electrode substrate, a low expansion non-alkali glass substrate (7059 glass manufactured by Corning Co., Ltd. 100 mm × 100 mm, thickness 0.7 mm) on which an ITO electrode was formed was prepared and washed by a conventional method.

Next, the glass substrate on which the resin material layer is formed as described above and the counter electrode substrate are opposed to each other so that the distance between the ITO electrodes is in the range of 5 to 15 μm, and the peripheral portion is sealed with a seal member. Then, liquid crystal (liquid crystal for TFT manufactured by Chisso Corporation) was injected between both substrates, and the injection port was sealed to prepare a liquid crystal cell for measurement. The liquid crystal used had a voltage holding ratio of 95% measured under the following voltage holding ratio measuring conditions with the above-mentioned liquid crystal cell for measurement before the forced impurity extraction treatment.
That is all.

(2) Forced extraction of impurities and measurement of voltage holding ratio The liquid crystal cell for measurement produced in (1) above was subjected to heat treatment (in an oven at 105 ° C. for 2.5 hours),
Impurity forced extraction processing was performed on the resin member layer. Next, the liquid crystal cell for measurement subjected to the forced impurity extraction treatment as described above was returned to room temperature and the voltage holding ratio was measured under the following conditions. The results are shown in Table 1 below. (Voltage holding rate measurement conditions) -ITO electrode distance: 5 to 15 m-Applied voltage pulse amplitude: 10 V-Applied voltage pulse frequency: 60 Hz-Applied voltage pulse width: 16.67 msec

Preparation of color filter As a substrate for the color filter, 100 mm × 100 m
m, 1.1 mm thick glass substrate (Corning 70
59 glass) was prepared. After washing this substrate according to a standard method, each of the prepared six kinds of G1 and G2 resin compositions was applied onto each glass substrate by spin coating, and prebaked at 80 ° C. for 3 minutes. It was
After that, using a predetermined photomask, exposure (150 mJ
/ Cm ² ) and spray developing with a 0.05% KOH aqueous solution for 60 seconds, and then post-baking it.
A green colored layer having a thickness of 1.5 μm was formed on the substrate. still,
The post-baking conditions were 230 ° C. and 20 minutes. As a result, 12 types of color filters (Samples 1 to 12) were produced.

Preparation of Liquid Crystal Display Device A transparent common electrode made of indium tin oxide (ITO) was formed on each of the above color filters (Samples 1 to 12). A glass substrate (7059 glass manufactured by Corning Incorporated) having a size of 100 mm × 100 mm and a thickness of 1.1 mm was prepared as a transparent substrate. After cleaning this substrate according to a standard method, thin film transistors (TFTs) are formed at a plurality of predetermined locations on the substrate, and transparent pixel electrodes are connected to indium tin oxide (ITO) transparent electrodes so as to be connected to the drain electrodes of the respective TFTs.
To form a counter electrode substrate.

Next, a polyimide resin coating material is applied so as to cover the transparent common electrode of the color filter and the transparent pixel electrode of the counter electrode substrate and dried to form an alignment layer (thickness 0.07 μm).
m) was provided and orientation treatment was performed. Next, liquid crystal display devices (Samples 1 to 12) were produced using these color filters and the counter electrode substrate. A liquid crystal for TFT manufactured by Chisso Corporation was used as the liquid crystal.

Evaluation of Liquid Crystal Display Device The 12 types of liquid crystal display devices (Samples 1 to 12) produced were subjected to continuous image display for 72 hours under the conditions of 23 ° C. and 60% RH, and the display quality was determined according to the following criteria. The evaluation results are shown in Table 1 below. (Evaluation criteria for display quality) ○: No display unevenness, display quality is extremely good ×: Display unevenness is observed, and a display defect phenomenon is recognized.

[0046]

[Table 1]

As shown in Table 1, the weight ratio (P / V) of the pigment to the film-forming resin component is in the range of 0 to 0.3, and the formed resin member is in contact with the liquid crystal. A color filter (Samples 1 to 4) produced by using the resin composition of the present invention which is subjected to the forced extraction of impurities with the resin composition and maintains the holding ratio of the voltage applied to the liquid crystal through the resin member at 80% or more.
The liquid crystal display device provided with No. did not cause a display defect phenomenon even when performing image display continuously for 72 hours under the conditions of 23 ° C. and 60% RH. On the other hand, the liquid crystal display device provided with the color filter (Samples 5 to 12) produced by using the comparative resin composition had a temperature of 7% under the conditions of 23 ° C. and 60% RH.
In the image display for 2 hours continuously, a display defect phenomenon was recognized.

Example 2 First, the weight ratio (P / V) of the pigment and the film-forming resin component (the total amount of the dispersant, the monomer, the polymer, the polymerization initiator, and the additive) was 0.2. A resin composition R having a composition was prepared. (Resin Composition R) -Pigment (P.R. 209) 8 parts by weight-Pigment (PY 150) 2 parts by weight-Dispersant (Disper Bic 161 manufactured by Big Chemie) 4 parts by weight Monomer 40 Weight part (pentaerythritol hexaacrylate) Polymer (styrene / acrylic acid copolymer) 60 parts by weight (copolymerization weight ratio = 80/20, weight average molecular weight = 20000) Photoinitiator ... 20 parts by weight (Ciba) Specialty Chemicals Irgacure 907) ・ Solvent: 500 parts by weight (propylene glycol-1-monomethyl ether-2-acetate)

Next, in the same manner as in Example 1, the resin composition R was subjected to forced impurity extraction treatment and the voltage holding ratio was measured. As a result, the voltage holding ratio was 84%. Next, using the above resin composition R, a color filter was produced in the same manner as in Example 1, and a liquid crystal display device was produced using this color filter. When this liquid crystal display device was subjected to continuous image display for 72 hours under the conditions of 23 ° C. and 60% RH, there was no display unevenness and the display quality was extremely good.

Example 3 First, the weight ratio (P / V) of the pigment and the film-forming resin component (the total amount of the dispersant, the monomer, the polymer, the polymerization initiator, and the additive) was 0.2. A resin composition B having a composition was prepared. (Resin composition B) -Pigment (P.B.15: 6) 4 parts by weight-Dispersant (Solsperse 24000 manufactured by Avicia) 2 parts by weight-Monomer 40 parts by weight (pentaerythritol hexaacrylate) -Polymer (styrene / Acrylic acid copolymer): 60 parts by weight (copolymerization weight ratio = 80/20, weight average molecular weight = 20000) Photoinitiator: 20 parts by weight (Ciba Specialty Chemicals Irgacure 907) Solvent: 500 parts by weight (Propylene glycol-1-monomethyl ether-2-acetate)

Next, in the same manner as in Example 1, the resin composition B was subjected to forced impurity extraction treatment and the voltage holding ratio was measured. As a result, the voltage holding ratio was 86%. Next, using the above resin composition B, a color filter was produced in the same manner as in Example 1, and a liquid crystal display device was produced using this color filter. When this liquid crystal display device was subjected to continuous image display for 72 hours under the conditions of 23 ° C. and 60% RH, there was no display unevenness and the display quality was extremely good.

[0052]

As described in detail above, according to the present invention, the weight ratio (P / V) of the pigment constituting the resin composition and the film-forming resin component is within a specific range, and the formed resin is When the member is subjected to the forced impurity extraction treatment in a state of being in contact with the liquid crystal, the holding rate of the voltage applied to the liquid crystal through the resin member is 80% or more.
A color filter including a resin member formed of this resin composition does not cause display unevenness even when it comes into contact with a liquid crystal layer in a liquid crystal display device, and enables a liquid crystal display device with excellent display quality. Further, as each material constituting the resin composition, a material satisfying the above-mentioned specific condition can be selected and used, so that the selection range of the constituent material to be used becomes wide.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a configuration of a measurement liquid crystal cell for performing an impurity forced extraction process and a voltage holding ratio measurement.

FIG. 2 is a schematic cross-sectional view showing an example of a color filter.

FIG. 3 is a schematic cross-sectional view showing another example of a color filter.

FIG. 4 is a schematic cross-sectional view showing another example of a color filter.

[Explanation of symbols] 10 ... Liquid crystal cell for measurement 13, 16 ... ITO electrode 17 ... Resin member 18 ... Liquid crystal 21, 31, 41 ... Color filter 22, 32 ... Transparent substrate 42 ... substrate 23, 33 ... Black matrix 24, 34, 46 ... Colored layer 43 ... Driving element layer 44 ... Reflective electrode layer

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 2H048 BA45 BA47 BB01 BB02 BB08                       BB37 BB44                 2H091 FA02Y FA14Z GA01 GA13                       GA16 LA30                 2H096 AA00 AA28 AA30 BA05 LA17                       LA30

Claims (5)

[Claims] 1. A film-forming resin component (V) and a solvent are contained, and the weight ratio (P / V) of the film-forming resin component (V) is in the range of 0 to 0.3. When the resin member containing the pigment (P) is subjected to the forced impurity extraction treatment in a state of being in contact with the liquid crystal, the holding rate of the voltage applied to the liquid crystal through the resin member is 80.
% Or more, a resin composition for a color filter. 2. A transparent substrate and a colored layer having a colored pattern of a plurality of colors provided on the transparent substrate, wherein the colored layer is formed by using the resin composition for a color filter according to claim 1. A color filter characterized in that 3. A transparent substrate, a colored layer having a colored pattern of a plurality of colors provided on the transparent substrate, and a transparent protective layer formed so as to cover the colored layer, and at least the protective layer. A color filter formed using the resin composition for a color filter according to claim 1. 4. A transparent columnar protrusion formed at a plurality of predetermined sites on the transparent substrate and protruding from the protective layer,
The color filter according to claim 3, wherein the columnar convex portion is formed by using the resin composition for a color filter according to claim 1. 5. A substrate, a drive element layer and a reflective electrode layer which are sequentially laminated on the substrate, and a colored layer formed on the reflective electrode layer and having a colored pattern of a plurality of colors, wherein the colored layer is formed by: Item 1. A color filter formed using the resin composition for a color filter according to Item 1.