JP2001272526A - Color filter and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color filter which is free from any inconvenience such as color mixing and comprised a pixel part formed on a photocatalyst containing layer with an inkjet method. SOLUTION: The color filter is characterized by having a transparent substrate, light shielding parts arranged at positions on the boundaries of the pixel part on the transparent substrate, a primer layer formed on the light shielding parts and the transparent substrate with the protrusions and recessions of the surface falling within ±10,000 Å, the photocatalyst-containing layer formed on the primer layer, containing at least a photocatalyst and a binder and being a layer with the wettability varied by exposure so as to lower the contact angle with a liquid and the pixel part formed by the inkjet method on the photocatalyst containing layer with plural colors in a pattern specified by the position between the light shielding parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a color filter suitable for a color liquid crystal display device, which is obtained by coloring a pixel portion by an ink jet method, and a method of manufacturing the same.

[0002]

2. Description of the Related Art In recent years, with the development of personal computers, especially portable personal computers, the demand for liquid crystal display devices, especially color liquid crystal display devices, has been increasing. However, since the color liquid crystal display device is expensive, there is an increasing demand for cost reduction, and in particular, there is a high demand for cost reduction for a color filter having a high specific gravity in terms of cost.

Such a color filter usually has three primary color patterns of red (R), green (G), and blue (B), and has electrodes corresponding to respective pixels of R, G, and B. Is turned on and off, the liquid crystal operates as a shutter, and light passes through each pixel of R, G, and B to perform color display.

In the conventional method of manufacturing a color filter, the same process is generally repeated three times in order to color R, G, and B colors. There is a problem that the yield is reduced due to repetition. As a method of avoiding such a problem and obtaining a color filter at low cost, various methods of forming a colored layer (pixel portion) by spraying a colored ink by an inkjet method have been proposed (JP-A-59-75205).
JP, JP-A-9-203803, JP-A-8-2803
30314, and JP-A-8-227012). However, none of these methods is necessarily satisfactory in terms of the process and the quality of the obtained color filter.

The present inventors have proposed a method using a photocatalyst-containing layer as a method for forming a colored layer (pixel portion) by spraying a colored ink by an ink jet method (Japanese Patent Laid-Open No. 11-337726). According to this method, it is possible to easily form a pattern having different wettability by exposure, and by forming a colored layer (pixel portion) thereon,
An inexpensive and high-quality color filter can be provided.

When a color filter is manufactured using such a photocatalyst-containing layer, usually, for example, as shown in FIG. 3, a light-shielding portion 2 is formed on a transparent substrate 1 (FIG. 3A). The photocatalyst-containing layer 3 is applied over the entire surface of the portion 2 (FIG. 3B), and pattern exposure is performed using a photomask 4 or the like to make the pixel portion forming portion 5 a lyophilic region (FIG.
(c)) The pixel portion forming ink 7 is attached to the pixel portion forming portion 5 which is the lyophilic region using the ink jet device 6 (FIG. 3 (d)). At this time, the pixel portion forming ink 7
Is uniformly spread in the exposed pixel portion forming portion 5 and does not spread to a non-exposed portion, that is, a lyophobic portion, and is precisely applied to only the pixel portion forming portion 5.
By curing the pixel portion forming ink 7 to form the pixel portion 8, a high-precision and high-quality color filter 9 is formed (FIG. 3E).

However, the photocatalyst-containing layer is prepared by preparing a coating solution for forming the photocatalyst-containing layer and applying the coating solution by a usual method such as spin coating. It is said to be a thin layer. On the other hand, the thickness of the light-shielding portion (black matrix) formed on the glass substrate is about 1000 to 2000 mm even when formed of a metal chromium film. The thickness is 10
More than double. When the photocatalyst-containing layer, which is the thin layer, is formed with such a light-shielding portion formed on a transparent substrate, the following problems occur.

That is, as shown in FIG.
When the light shielding portion 2 is formed thereon (FIG. 4 (a)) and the photocatalyst containing layer 3 is applied thereon, the photocatalyst containing layer 3 is formed as described above.
4B cannot cope with the unevenness of the light-shielding portion 2 because it is necessary to reduce the film thickness in relation to the light transmittance.
As shown in (1), there is a possibility that the photocatalyst containing layer 3 is not formed on the light-shielding portion 2, or even if it is formed, it becomes an extremely thin layer.

As described above, the photocatalyst containing layer 3
In the state where no is formed, pattern exposure is performed through the photomask 4 (FIG. 4C), and the pixel portion forming ink 7 is applied by the inkjet device 6 (FIG. 4C).
(d)) Since the photocatalyst-containing layer 2 is not formed on the light-shielding portion 2 or becomes a very thin layer, the liquid-repellent region normally formed on the light-shielding portion 2 is not formed. Or, sufficient liquid repellency cannot be exhibited. Therefore, as shown in FIG. 4E, the applied inks for forming the pixel portions of a plurality of colors are mixed at the boundary portion M, and a problem arises in that a high-quality color filter cannot be obtained. It is.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is intended to provide a color filter in which a pixel portion is formed on a photocatalyst-containing layer by an ink-jet method without a defect such as color mixing. It is intended to provide a filter.

[0011]

To achieve the above object, according to the present invention, a transparent substrate, a light-shielding portion provided on the transparent substrate and at a boundary portion of a pixel portion, and A primer layer formed on the light-shielding portion and the transparent substrate, and formed on the surface of the primer layer so that the unevenness of the surface is within ± 10000 °, and formed on the primer layer,
And a photocatalyst-containing layer that contains at least a photocatalyst and a binder and that changes wettability so that the contact angle with a liquid is reduced by exposure, and a plurality of colors formed on the photocatalyst-containing layer by an ink-jet method. And a pixel portion formed in a predetermined pattern determined at a position between them.

As described above, the present invention provides a photocatalyst-containing layer formed on a transparent substrate on which a light-shielding portion is formed, since the surface of the primer layer has irregularities within the above range. Can be formed so as not to cause a problem. Therefore, it is necessary to provide a color filter of good quality without the problem of forming the photocatalyst-containing layer directly on the light-shielding portion, that is, the problem of color mixing in the pixel portion without forming the photocatalyst-containing layer on the light-shielding portion. Can be.

[0013] In the invention described in claim 1, as described in claim 2, the primer layer comprises:
It is preferable to have a thickness within a range of ± 50% based on the thickness of the light-shielding portion. If the thickness of the primer layer is thinner than this range, when the photocatalyst-containing layer is formed on the primer layer, the unevenness of the primer layer surface becomes large due to the unevenness caused by the light shielding portion, and the photocatalyst-containing layer is uniformly applied. It is not preferable because the possibility that the color filter is not formed is not preferable, and if the film thickness is larger than this range, the film thickness of the finally obtained color filter becomes too thick. For example, it is difficult to use the color filter as a color liquid crystal display device. It is not preferable for some reasons, for example, a problem with transparency may occur.

According to the first or second aspect of the present invention, as described in the third aspect, the width of the pixel portion is formed to be larger than the width of the opening formed by the light shielding portion. It is preferred that This is because in the finally obtained color liquid crystal display device, a high-quality color filter free from defects such as color omission can be obtained.

[0015] In the color filter according to any one of the first to third aspects, the photocatalyst containing layer, which is one of the components constituting the photocatalyst containing layer, is described in the fourth aspect. As shown, titanium oxide (Ti
O ₂ ), zinc oxide (ZnO), tin oxide (SnO ₂ ), strontium titanate (SrTiO ₃ ), tungsten oxide (WO ₃ ), bismuth oxide (Bi ₂ O ₃ ), and iron oxide (Fe ₂ O ₃ ) Preferably, the material is one or two or more materials selected from the group consisting of titanium oxide (TiO ₂ ).
This is because titanium oxide has a high band gap energy and is effective as a photocatalyst, and is chemically stable, has no toxicity, and is easily available.

Further, in the color filter according to any one of the first to fifth aspects, the binder as another component constituting the photocatalyst-containing layer may be as described in the sixth aspect. In the formula, Y _n SiX _(4-n) (where Y represents an alkyl group, a fluoroalkyl group, a vinyl group, an amino group, a phenyl group or an epoxy group;
Represents an alkoxyl group or a halogen. n is an integer from 0 to 3. ) Is preferably an organopolysiloxane that is one or more hydrolytic condensates or cohydrolytic condensates of the silicon compound represented by the formula (1). As a binder for the photocatalyst-containing layer, a high molecular compound having a siloxane bond that is not easily decomposed by the action of the photocatalyst is preferable, and by using such an organopolysiloxane, the liquid repellency before exposure can be set. This is because it can be easily performed and has good lyophilicity after exposure.

In the invention described in any one of the first to sixth aspects, as described in the seventh aspect, the surface tension on the photocatalyst containing layer is 40 mN.
It is preferable that the contact angle with the liquid of / m is larger by 1 degree or more in the region not irradiated with energy than in the region irradiated with energy. This is because if there is a difference in the contact angle of at least one degree, it is relatively easy to apply the pixel portion forming ink in a pattern when forming the pixel portion.

According to the present invention, (1) a step of forming a light-shielding portion on a transparent substrate;
(2) On the surface of the transparent substrate on which the light shielding portion is formed,
A step of forming a primer layer formed so that the surface irregularities are in the range of ± 10000 °; and (3) contacting the primer layer with the liquid by irradiating energy with at least a photocatalyst and a binder. Providing a photocatalyst-containing layer which is a layer whose wettability changes so as to reduce the angle; and (4) forming a pixel portion exposure portion by pattern-irradiating energy onto the photocatalyst-containing layer;
(5) a step of forming a pixel portion by applying ink to the exposed portion for the pixel portion by an ink-jet method to form a pixel portion.

When the photocatalyst-containing layer is applied after forming the light-shielding portion on the transparent substrate, the photocatalyst-containing layer can be formed after the primer layer having the surface irregularities within the above range is formed. Therefore, the photocatalyst-containing layer can be spread over the entire surface with a relatively uniform film thickness, and therefore, problems such as color mixing do not occur.

In the method for manufacturing a color filter according to the present invention, it is preferable that the energy applied to the photocatalyst-containing layer is light including ultraviolet light. Since titanium dioxide is preferable as a photocatalyst used in the photocatalyst-containing layer, it is preferable that the irradiation energy be light containing ultraviolet rays for activating the titanium dioxide.

According to a tenth aspect of the present invention, there is provided a color filter according to any one of the first to seventh aspects, and a substrate facing the color filter. Provided is a color liquid crystal display device characterized in that a liquid crystal compound is sealed therebetween. Such a color liquid crystal display device has an advantage of the color filter of the present invention, that is, an effect of achieving high quality without a problem such as color mixing.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the color filter of the present invention,
A method for manufacturing a color filter and a color liquid crystal display device will be described.

1. First, the color filter of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an example of the color filter of the present invention. The color filter shown in FIG. 1 includes a transparent substrate 1 and a light shielding portion 2 formed on the transparent substrate 1.
A primer layer 9 formed so as to cover the light-shielding portion 2 and the transparent substrate 1; a photocatalyst-containing layer 3 formed on the primer layer 9; And a pixel section 8 formed on the pixel section forming section 5 described above.

As described above, in the color filter of the present invention, the primer layer 9 for alleviating unevenness caused by the formation of the light shielding portion 2 on the light shielding portion 2 is formed, and the photocatalyst containing layer 3 is formed thereon. Are formed. Therefore,
Since the photocatalyst-containing layer 3 has irregularities formed on the primer layer within a predetermined range, the photocatalyst-containing layer 3 can be formed to have a uniform thickness. Therefore, there is no possibility that a problem caused by the photocatalyst containing layer 5 not being formed uniformly, such as the photocatalyst containing layer 5 not being formed on the light shielding portion 2 as described above.

The structure of the color filter of the present invention will be described separately.

(Primer Layer) The feature of the present invention resides in that a primer layer 9 is formed on the light shielding portion 2 as shown in FIG. This primer layer has a surface unevenness in the range of ± 10000 °, preferably ± 5000 °.
Å, particularly preferably ± 2000Å. When the unevenness is larger than the above range, when the photocatalyst-containing layer is formed thereon, the thickness of the photocatalyst-containing layer becomes non-uniform. This is because there is a possibility that a region where the pixel portion cannot be obtained may occur, and a problem that the pixel portion cannot be formed with high accuracy may occur.

The specific film thickness of such a primer layer is determined by the relationship with the film thickness of the light-shielding portion, and depends on the material for forming the primer layer, the viscosity of the coating liquid for forming the primer layer, and the like. Although it is variable, it is not particularly limited, but is generally within a range of ± 50%, preferably within a range of ± 20%, based on the film thickness of the light shielding portion.
In particular, it is preferable to be within the range of ± 5%.

If the film thickness is smaller than the above range, unevenness due to the light-shielding portion remains on the primer layer, and there is a possibility that uniform coating may not be performed. Since the thickness of the color filter itself is increased, the thickness of the color filter itself is increased, which is not preferable because it is against the recent demand for downsizing or the like. is there.

The material that can be used for the primer layer is not particularly limited as long as it is a transparent material.
For example, a UV curable resin, a thermosetting resin, or the like can be used. These resins will be specifically described below.

UV Curable Resin The UV curable resin used in the present invention has at least one or more functional groups, and is formed by ion or radical generated by irradiating a photoinitiator with a curing energy ray. A polymer or a monomer that undergoes polymerization or radical polymerization to increase the molecular weight or form a crosslinked structure is used. The term "functional group" as used herein means an atomic group or a bonding mode that causes a reaction such as a vinyl group, a carboxyl group, and a hydroxyl group.

Examples of such monomers and oligomers include epoxy acrylate, urethane acrylate, polyester acrylate, polyether acrylate,
Acrylic type such as silicon acrylate and non-acrylic type such as unsaturated polyester / styrene type and polyene / styrene type are exemplified. Among them, acrylic type is preferable in view of curing speed and a wide range of physical property selection. Representative examples of such an acrylic type are shown below.

First, monofunctional groups include 2-ethylhexyl acrylate, 2-ethylhexyl EO adduct acrylate, ethoxydiethylene glycol acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, and caprolactone addition of 2-hydroxyethyl acrylate. Product, 2-phenoxyethyl acrylate, phenoxydiethylene glycol acrylate, nonylphenol EO adduct, acrylate with caprolactone added to nonylphenol EO adduct, 2-hydroxy-3-phenoxypropyl acrylate, tetrahydrofurfuryl acrylate, caprolactone adduct of furfuryl alcohol Acrylate, acryloyl morpholine, dicyclopentenyl acrylate, Cyclopentanyl acrylate,
Dicyclopentenyloxyethyl acrylate, isobornyl acrylate, acrylate of a caprolactone adduct of 4,4-dimethyl-1,3-dioxolane, 3-
An acrylate of a caprolactone adduct of methyl-5,5-dimethyl-1,3-dioxolane and the like can be mentioned.

The polyfunctional groups include hexanediol diacrylate, neopentyl glycol diacrylate, polyethylene glycol diacrylate,
Tripropylene glycol diacrylate, neopentyl glycol hydroxypivalate diacrylate, caprolactone adduct of neopentyl glycol hydroxypivalate diacrylate, 1,6
-Acrylic acid adduct of diglycidyl ether of hexanediol, diacrylate of acetal compound of hydroxypivalaldehyde and trimethylolpropane, 2,
2-bis [4- (acryloyloxydiethoxy) phenyl] propane, 2,2-bis [4- (acryloyloxydiethoxy) phenyl] methane, diacrylate of hydrogenated bisphenol ethylene oxide adduct, tricyclode Candimethanol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, trimethylolpropane propylene oxide adduct triacrylate, glycerin propylene oxide adduct triacrylate, dipentaerythritol hexaacrylate pentaacrylate mixture, dipentaerythritol caprolactone addition Acrylate, tris (acryloyloxyethyl) isocyanurate, 2-acryloyloxyethyl phosphate, and the like.

The photopolymerization initiator contained in the UV curable resin used in the present invention is not particularly limited, and can be selected from known ones. Specifically, carbonyl compounds such as acetophenone, benzophenone, Michler's ketone, benzyl, benzoin, benzoin ether, benzyldimethyl ketal, benzoin benzoate, α-acyloxime ester, tetramethylthiuram monosulfide, thioxanthones And phosphorus compounds such as 2,4,6-trimethylbenzoyldiphenylphosphinoxide.

Next, the thermosetting resin will be described. Examples of the thermosetting resin composition used in the present invention include those capable of being cured by the application of thermal energy and capable of forming a transparent and flat surface after curing. Representative examples include polycarbonate, polymethyl methacrylate, methyl phthalate homopolymer or copolymer,
Polyethylene terephthalate, polystyrene, diethylene glycol bisallyl carbonate, acrylonitrile / styrene copolymer, poly (-4-methylpentene-
1) and the like.

Since a photocatalyst-containing layer is further formed on such a primer layer, the surface of the primer layer is formed so that the coating liquid for forming the photocatalyst-containing layer is sufficiently wetted and spread to have a uniform film thickness. Is preferably lyophilic. Specifically, the contact angle with a liquid having a surface tension of 40 mN / m is 1
It is preferable to be formed of a material having a temperature of 0 degrees or less.

(Transparent Substrate) As shown in FIG. 1, in the color filter of the present invention, a light-shielding portion 2 and the primer layer 9 are formed on a transparent substrate 1. And at least the pixel portion 8 are formed. Such a transparent substrate is not particularly limited as long as it has been conventionally used for a color filter. For example, a transparent rigid material having no flexibility such as quartz glass, Pyrex (registered trademark) glass, a synthetic quartz plate, or a transparent flexible material having flexibility such as a transparent resin film or an optical resin plate is used. Can be. Among them, especially Corning 70
59 glass is a material having a small coefficient of thermal expansion, excellent in dimensional stability and workability in high-temperature heat treatment, and is a non-alkali glass containing no alkali component in the glass. Suitable for color filters. In the present invention, a transparent substrate is usually used as a transparent substrate, but a reflective substrate or a substrate colored white can also be used.
Further, as the transparent substrate, a substrate which has been subjected to surface treatment for preventing alkali elution, imparting a gas barrier property or other purposes as necessary may be used.

(Light-shielding part) In the present invention, as shown in FIG. 1, the light-shielding part 2 is formed on the transparent substrate 1 at a position corresponding to the boundary of the pixel part 8. This light-shielding portion may be formed of a thin metal film such as chromium, or may be a layer in which light-shielding particles such as carbon fine particles, metal oxides, inorganic pigments, and organic pigments are contained in a resin binder. You may. Regardless of the light-shielding portion, in the present invention, the size of the unevenness caused by the film thickness is reduced,
Since a primer layer having a flatter surface is formed, no problem occurs in the formation of the photocatalyst-containing layer even when a thick resin light-shielding portion is formed, and a problem such as color mixing in the pixel portion occurs. Because there is no.

Examples of the metal light-shielding portion include those formed by forming a metal thin film of chromium or the like on a transparent substrate by a sputtering method, a vacuum evaporation method, or the like, and patterning the thin film. What is the film thickness of such a metal light shielding portion? Generally, 1000 to 2000
About Å.

On the other hand, the resin light-shielding portion is a layer in which light-shielding particles are contained in a binder as described above.
Examples of the resin binder include one or a mixture of two or more resins such as polyimide resin, acrylic resin, epoxy resin, polyacrylamide, polyvinyl alcohol, gelatin, casein, and cellulose; photosensitive resin; and O / W emulsion. Mold resin compositions, for example, those obtained by emulsifying reactive silicone can be used. A commonly used method such as a photolithography method and a printing method can be used as a method for patterning the resin light-shielding portion. It is also possible to form another photocatalyst-containing layer on a transparent substrate, form a pattern having different wettability by exposure, and use this to pattern. The thickness of such a resin light-shielding portion can be generally set within a range of 0.5 to 10 μm, preferably, 1 to 2 μm.

(Photocatalyst-Containing Layer) In the color filter of the present invention, as shown in FIG. 1, the light-shielding portion 2 is formed on the transparent substrate 1 and the transparent substrate 1 on which the light-shielding portion 2 is formed.
A primer layer 9 which is a feature of the present invention for flattening the surface is formed thereon, and a photocatalyst containing layer 3 for forming the pixel portion 8 simply and accurately is provided on the surface thereof. ing.

The photocatalyst-containing layer used in the present invention is a layer having at least a photocatalyst and a binder and having a wettability that changes by exposure so that the contact angle with a liquid is reduced. Although not particularly limited, the photocatalyst-containing layer in the present invention is a layer mainly used for forming a pixel portion. That is, since the photocatalyst-containing layer is such that the wettability changes so that the contact angle with the liquid is reduced by exposure, for example, by performing pattern exposure so as to expose only the portion where the pixel portion is formed, The wettability of a portion where a pixel portion is formed can be easily reduced, and a lyophilic region having a small contact angle with a liquid can be obtained. Therefore, by applying the ink by the ink-jet method to the lyophilic region as described above, the pixel portion is formed only in the portion where the pixel portion is easily formed due to the difference in wettability with the non-exposed lyophobic region. Forming ink can be applied. Thereafter, the pixel portion can be easily formed by curing the applied ink. in this way,
By forming the pixel portion using the photocatalyst-containing layer, the manufacturing cost can be significantly reduced, and the cost of a color liquid crystal display device or the like as a final product can be significantly reduced.

Here, the lyophilic region is a region having a small contact angle with the liquid, and is a region having good wettability with the ink for ink-jet or the like forming the pixel portion. Further, the lyophobic region is a region having a large contact angle with a liquid, and is a region having poor wettability with an ink for inkjet forming the pixel portion.

In the photocatalyst-containing layer used in the present invention, the contact angle with the liquid having a surface tension of 40 mN / m in the unexposed portion not irradiated with the energy is such that the surface tension in the exposed portion irradiated with the energy is 40 mN / m. Preferably, the contact angle is at least 1 degree larger than the contact angle with the liquid, particularly preferably at least 10 degrees. This is because if there is such a difference in the contact angle, the pixel portion forming ink can be applied with high accuracy to the exposed lyophilic region.

Specifically, in the unexposed portion of the photocatalyst-containing layer, the contact angle with a liquid having a surface tension of 40 mN / m is 10 degrees or more, preferably 30 mN / m.
m is 10 degrees or more, especially the surface tension is 20 m
It is preferable that the contact angle with the N / m liquid is 10 degrees or more. This is because the non-exposed portion is a portion requiring liquid repellency in the present invention, so if the contact angle with the liquid is small, the liquid repellency is not sufficient, and the pixel portion is formed. This is because there is a possibility that the ink for ink jetting may remain in a region where the pixel portion is not formed, and the pixel portion cannot be accurately formed.

On the other hand, in the exposed portion, the surface tension is 40 m
The contact angle with a liquid having an N / m of less than 9 degrees, preferably a contact angle with a liquid having a surface tension of 50 mN / m is 10 degrees or less, particularly a contact angle with a liquid having a surface tension of 60 mN / m is 10 degrees or less. Such a layer is preferable. If the contact angle of the exposed portion with the liquid is high, the spread of the ink of the ink jet method for forming the pixel portion in the exposed portion may be inferior, and color loss or the like may occur in the pixel portion. It is.

Here, the contact angle with a liquid is measured by using a contact angle measuring device (CA-Z type manufactured by Kyowa Interface Science Co., Ltd.) to measure the contact angle with a liquid having various surface tensions (micrometer). 30 seconds after dropping the droplet from the syringe), and the result or the result is graphed. In this measurement, wetting index standard solutions manufactured by Junsei Chemical Co., Ltd. were used as liquids having various surface tensions.

The photocatalyst-containing layer used in the present invention is composed of at least a photocatalyst and a binder. With such a configuration, the type of the binder before the exposure can be determined by selecting the type of the binder. This is because adjustments such as reducing the critical surface tension and increasing the critical surface tension after exposure can be easily performed. Specifically, the photocatalyst oxidizes organic groups and additives that are part of the binder,
Using the action of decomposition or the like, the wettability of the exposed portion is changed to make it lyophilic, and a large difference in wettability with the unexposed portion can be caused. Since the photocatalyst-containing layer has a binder as described above, the receptivity (lyophilic property) of the exposed portion with the ink of the ink jet system forming the pixel portion in the exposed portion or the repellency (liquid repellency) of the unexposed portion is increased. As a result, a color filter having good quality and advantageous in cost can be obtained.

In the present invention, when the photocatalyst-containing layer further contains fluorine, and the fluorine content on the surface of the photocatalyst-containing layer is such that the photocatalyst-containing layer is exposed to light, etc. The photocatalyst-containing layer may be formed so that the photocatalyst-containing layer is reduced by the action as compared to before the exposure.

In a color filter having such characteristics, it is possible to easily form a pattern composed of a portion having a low fluorine content by pattern exposure. Here, fluorine has an extremely low surface energy, so that the surface of a substance containing a large amount of fluorine has a smaller critical surface tension. Therefore, the critical surface tension of the portion having a low fluorine content is larger than the critical surface tension of the portion having a high fluorine content. This means that a portion having a low fluorine content is a lyophilic region as compared with a portion having a high fluorine content. Therefore, forming a pattern composed of a portion having a lower fluorine content than the surrounding surface forms a pattern of the lyophilic region in the lyophobic region.

Therefore, when such a photocatalyst-containing layer is used, the pattern of the lyophilic region can be easily formed in the lyophobic region by pattern exposure, so that the lyophilic region It is possible to easily form a pixel portion or the like only on a single pixel, and a low-cost and high-quality color filter can be obtained. In addition, since the lyophilic region can be formed by exposure, the photocatalyst-containing layer that is easily exposed to the gap between the pixel portions is exposed to light when forming the photocatalyst-containing layer removal portion, so that the lyophilic region is formed. Thus, the developer can be accurately adhered thereto.

As described above, the content of fluorine contained in the fluorine-containing photocatalyst-containing layer is determined by the fact that the fluorine content in the lyophilic region formed by exposure and having a low fluorine content is lower than the unexposed portion. When the fluorine content is 100, it is preferably 10 or less, more preferably 5 or less, and particularly preferably 1 or less.

By setting the content within such a range, it is possible to cause a great difference in wettability between an exposed portion and an unexposed portion. Therefore, by forming a pixel portion or the like in such a photocatalyst containing layer, it becomes possible to accurately form a pixel portion or the like only in a lyophilic region having a reduced fluorine content, and to obtain a color filter with high accuracy. Because it can be. In addition, this reduction rate is based on weight.

For the measurement of the fluorine content in the photocatalyst-containing layer, various methods generally used can be used. For example, X-ray photoelectron spectroscopy (X-ray Phot spectroscopy)
oelectron Spectroscopy, ESCA (Electron Spectroscop
y for Chemical Analysis). ), Any method capable of quantitatively measuring the amount of fluorine on the surface, such as X-ray fluorescence analysis and mass spectrometry.

The photocatalyst used in the present invention includes, for example, titanium oxide (TiO ₂ ), zinc oxide (ZnO), tin oxide (SnO ₂ ), strontium titanate (SrTiO ₃ ), and tungsten oxide (W) which are known as optical semiconductors.
O ₃ ), bismuth oxide (Bi ₂ O ₃ ), and iron oxide (F
e ₂ O ₃ ), and one or more of them may be used in combination.

In the present invention, titanium oxide is particularly preferably used because it has a high band gap energy, is chemically stable, has no toxicity, and is easily available. Titanium oxide includes anatase type and rutile type, and both can be used in the present invention, but anatase type titanium oxide is preferable. Anatase type titanium oxide has an excitation wavelength of 380 nm or less.

As such anatase type titanium oxide, for example, hydrolytic peptized anatase type titania sol (STS-02 (average particle size: 7 nm) manufactured by Ishihara Sangyo Co., Ltd.)
ST-K01 manufactured by Ishihara Sangyo Co., Ltd., anatase titania sol of nitric acid peptization type (TA-15 (average particle size: 12 nm) manufactured by Nissan Chemical Industries, Ltd.) and the like can be mentioned.

The smaller the particle size of the photocatalyst is, the more effective the photocatalytic reaction takes place. The average particle size is preferably 50 nm or less, more preferably 20 nm or less. In addition, the smaller the particle size of the photocatalyst is, the smaller the surface roughness of the formed photocatalyst-containing layer is. It is preferable that the particle size of the photocatalyst exceeds 100 nm. It is not preferable because the liquid repellency of the unexposed portion of the containing layer is reduced and the lyophilic property of the exposed portion becomes insufficient.

In the color filter of the present invention, as described above, the surface of the photocatalyst-containing layer contains fluorine, and the surface of the photocatalyst-containing layer is subjected to pattern exposure to reduce the fluorine content on the surface of the photocatalyst-containing layer. A color filter obtained by forming a pattern of a lyophilic region in a lyophobic region and forming a pixel portion or the like on the lyophilic region may be used. Even in this case, it is preferable to use the titanium dioxide as described above as the photocatalyst. However, when titanium dioxide is used in this way, the content of fluorine contained in the photocatalyst containing layer is determined by X-ray photoelectron. When analyzed by spectroscopy and quantified, when the titanium (Ti) element is set to 100, the fluorine (F) element is 500 or more, preferably 80 or more.
It is preferable that fluorine (F) element is contained on the surface of the photocatalyst-containing layer at a ratio of 0 or more, particularly preferably 1200 or more.

When fluorine (F) is contained in the photocatalyst-containing layer to this extent, the critical surface tension on the photocatalyst-containing layer can be sufficiently reduced, so that liquid repellency on the surface can be ensured. This is because the difference in wettability with the lyophilic region on the surface in the pattern portion where the fluorine content has been reduced by exposure can be increased, and the quality of the finally obtained color filter can be improved. .

Further, in such a color filter, the fluorine content in the parent ink region formed by pattern exposure is preferably 50 or less when the titanium (Ti) element is 100, and the fluorine content is preferably 50 or less. Is preferably 20 or less, more preferably 10 or less.

If the content of fluorine in the photocatalyst containing layer can be reduced to this extent, sufficient lyophilic property for forming a pixel portion or the like can be obtained, and the lyophobic property of the unexposed portion can be improved. The difference in wettability makes it possible to form a pixel portion and the like with high accuracy, and to obtain a high-quality color filter.

In the present invention, the binder used in the photocatalyst-containing layer preferably has a high binding energy such that the main skeleton is not decomposed by the photoexcitation of the photocatalyst. For example, (1) chloro or alkoxy by a sol-gel reaction or the like. Examples thereof include organopolysiloxanes that exhibit great strength by hydrolyzing and polycondensing silanes and the like, and (2) organopolysiloxanes obtained by crosslinking reactive silicones having excellent water repellency and oil repellency.

In the case of the above (1), the general formula: Y _n SiX _(4-n) (where Y represents an alkyl group, a fluoroalkyl group, a vinyl group, an amino group, a phenyl group or an epoxy group,
X represents an alkoxyl group, an acetyl group or a halogen. n is an integer from 0 to 3. ) Is preferably an organopolysiloxane that is one or more hydrolytic condensates or cohydrolytic condensates of the silicon compound represented by the formula (1). Here, the carbon number of the group represented by Y is preferably in the range of 1 to 20, and the alkoxy group represented by X is preferably a methoxy group, an ethoxy group, a propoxy group, or a butoxy group. preferable.

Specifically, methyltrichlorosilane, methyltribromosilane, methyltrimethoxysilane, methyltriethoxysilane, methyltriisopropoxysilane, methyltri-t-butoxysilane; ethyltrichlorosilane, ethyltribromosilane, ethyltrichlorosilane Methoxysilane, ethyltriethoxysilane, ethyltriisopropoxysilane, ethyltri-t-butoxysilane; n
-Propyltrichlorosilane, n-propyltribromosilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, n-propyltriisopropoxysilane, n-propyltri-t-butoxysilane; n-
Hexyltrichlorosilane, n-hexyltribromosilane, n-hexyltrimethoxysilane, n-hexyltriethoxysilane, n-hexyltriisopropoxysilane, n-hexyltri-t-butoxysilane; n-decyltrichlorosilane, n-decyltribromosilane,
n-decyltrimethoxysilane, n-decyltriethoxysilane, n-decyltriisopropoxysilane, n-
Decyltri-t-butoxysilane; n-octadecyltrichlorosilane, n-octadecyltribromosilane, n
-Octadecyltrimethoxysilane, n-octadecyltriethoxysilane, n-octadecyltriisopropoxysilane, n-octadecyltri-t-butoxysilane; phenyltrichlorosilane, phenyltribromosilane, phenyltrimethoxysilane, phenyltriethoxysilane, phenyl Triisopropoxysilane, phenyltri-t-butoxysilane; tetrachlorosilane, tetrabromosilane, tetramethoxysilane, tetraethoxysilane, tetrabutoxysilane, dimethoxydiethoxysilane; dimethyldichlorosilane, dimethyldibromosilane, dimethyldimethoxysilane , Dimethyldiethoxysilane; diphenyldichlorosilane, diphenyldibromosilane, diphenyldimethoxysilane, diphenyldiethoxysilane Phenyl methyldichlorosilane,
Phenylmethyldibromosilane, phenylmethyldimethoxysilane, phenylmethyldiethoxysilane; trichlorohydrosilane, tribromohydrosilane, trimethoxyhydrosilane, triethoxyhydrosilane, triisopropoxyhydrosilane, tri-t-butoxyhydrosilane; vinyltrichlorosilane, vinyltribromo Silane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltriisopropoxysilane, vinyltrit
-Butoxysilane; trifluoropropyltrichlorosilane, trifluoropropyltribromosilane, trifluoropropyltrimethoxysilane, trifluoropropyltriethoxysilane, trifluoropropyltriisopropoxysilane, trifluoropropyltri-t-butoxysilane; γ- Glycidoxypropylmethyldimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ
Glycidoxypropyltriisopropoxysilane, γ
-Glycidoxypropyltri-t-butoxysilane; γ-
Methacryloxypropylmethyldimethoxysilane, γ
-Methacryloxypropylmethyldiethoxysilane,
γ-methacryloxypropyltrimethoxysilane, γ
-Methacryloxypropyltriethoxysilane, γ-
Methacryloxypropyltriisopropoxysilane,
γ-methacryloxypropyltri-t-butoxysilane; γ-aminopropylmethyldimethoxysilane, γ-
Aminopropylmethyldiethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-aminopropyltriisopropoxysilane, γ-aminopropyltri-t-butoxysilane;
γ-mercaptopropylmethyldimethoxysilane, γ-
Mercaptopropylmethyldiethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, γ-mercaptopropyltriisopropoxysilane, γ-mercaptopropyltri-t-butoxysilane; β- (3,4-epoxy Cyclohexyl) ethyltrimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltriethoxysilane; and their partial hydrolysates; and mixtures thereof, can be used.

As the binder, particularly, a polysiloxane containing a fluoroalkyl group can be preferably used. Specifically, one or more hydrocondensation products of the following fluoroalkylsilanes, co-hydrolysis Examples thereof include condensates, and those generally known as a fluorine-based silane coupling agent can be used.

CF ₃ (CF ₂ ) ₃ CH ₂ CH ₂ Si (OC
H ₃ ) ₃ ; CF ₃ (CF ₂ ) ₅ CH ₂ CH ₂ Si (OC
H ₃ ) ₃ ; CF ₃ (CF ₂ ) ₇ CH ₂ CH ₂ Si (OC
H ₃ ) ₃ ; CF ₃ (CF ₂ ) ₉ CH ₂ CH ₂ Si (OC
_{H 3) 3; (CF 3} ) 2 CF (CF 2) 4 CH 2 CH 2 Si (O
CH ₃ ) ₃ ; (CF ₃ ) ₂ CF (CF ₂ ) ₆ CH ₂ CH ₂ Si
(OCH ₃ ) ₃ ; (CF ₃ ) ₂ CF (CF ₂ ) ₈ CH ₂ CH ₂ S
i (OCH ₃ ) ₃ ; CF ₃ (C ₆ H ₄ ) C ₂ H ₄ Si (OC
_{H 3) 3; CF 3 (} CF 2) 3 (C 6 H 4) C 2 H 4 Si (OC
H ₃ ) ₃ ; CF ₃ (CF ₂ ) ₅ (C ₆ H ₄ ) C ₂ H ₄ Si (OC
_{H 3) 3; CF 3 (} CF 2) 7 (C 6 H 4) C 2 H 4 Si (OC
H ₃ ) ₃ ; CF ₃ (CF ₂ ) ₃ CH ₂ CH ₂ SiCH ₃ (OCH
₃ ) ₂ ; CF ₃ (CF ₂ ) ₅ CH ₂ CH ₂ SiCH ₃ (OC
H ₃ ) ₂ ; CF ₃ (CF ₂ ) ₇ CH ₂ CH ₂ SiCH ₃ (OCH
₃ ) ₂ ; CF ₃ (CF ₂ ) ₉ CH ₂ CH ₂ SiCH ₃ (OC
H ₃ ) ₂ ; (CF ₃ ) ₂ CF (CF ₂ ) ₄ CH ₂ CH ₂ SiCH
₃ (OCH ₃ ) ₂ ; (CF ₃ ) ₂ CF (CF ₂ ) ₆ CH ₂ CH ₂
Si CH ₃ (OCH ₃ ) ₂ ; (CF ₃ ) ₂ CF (CF ₂ ) ₈
CH ₂ CH ₂ Si CH ₃ (OCH ₃ ) ₂ ; CF ₃ (C ₆ H ₄ )
C ₂ H ₄ SiCH ₃ (OCH ₃ ) ₂ ; CF ₃ (CF ₂ ) ₃ (C ₆
H ₄ ) C ₂ H ₄ SiCH ₃ (OCH ₃ ) ₂ ; CF ₃ (CF ₂ ) ₅
(C ₆ H ₄ ) C ₂ H ₄ SiCH ₃ (OCH ₃ ) ₂ ; CF ₃ (CF
_{2) 7 (C 6 H 4} ) C 2 H 4 SiCH 3 (OCH 3) 2; CF
₃ (CF ₂ ) ₃ CH ₂ CH ₂ Si (OCH ₂ CH ₃ ) ₃ ; CF ₃
(CF ₂ ) ₅ CH ₂ CH ₂ Si (OCH ₂ CH ₃ ) ₃ ; CF
₃ (CF ₂ ) ₇ CH ₂ CH ₂ Si (OCH ₂ CH ₃ ) ₃ ; CF ₃
(CF ₂ ) ₉ CH ₂ CH ₂ Si (OCH ₂ CH ₃ ) ₃ ; CF
₃ (CF ₂ ) ₇ SO ₂ N (C ₂ H ₅ ) C ₂ H ₄ CH ₂ Si (OC
H ₃ ) ₃

By using a polysiloxane having a fluoroalkyl group as described above as a binder,
The liquid repellency of the unexposed portion of the photocatalyst-containing layer is greatly improved, and a function of preventing adhesion of the ink for an inkjet system for forming a pixel portion is exhibited.

The reactive silicone of the above (2) includes compounds having a skeleton represented by the following general formula.

[0070]

Embedded image

Here, n is an integer of 2 or more, and R ¹ ,
R ² is a substituted or unsubstituted alkyl, alkenyl, aryl or cyanoalkyl group having 1 to 10 carbon atoms, and 40% or less of the whole is vinyl, phenyl or halogenated phenyl in a molar ratio. Further, those in which R ¹ and R ² are methyl groups are preferred because the surface energy is minimized, and the molar ratio of the methyl groups is preferably 60% or more. Further, the chain terminal or the side chain has at least one or more reactive group such as a hydroxyl group in the molecular chain.

Further, together with the above-mentioned organopolysiloxane, a stable organosilicon compound which does not undergo a crosslinking reaction such as dimethylpolysiloxane may be mixed with the binder.

In the present invention, the photocatalyst-containing layer may contain a surfactant in addition to the above-mentioned photocatalyst and binder. More specifically, NIKK manufactured by Nikko Chemicals Co., Ltd.
Hydrocarbons such as OLBL, BC, BO, and BB series, ZONYL FSN and FSO manufactured by DuPont, Surflon S-141 and 145 manufactured by Asahi Glass Co., Ltd., and Megafax F-141 manufactured by Dainippon Ink and Chemicals, Inc. 144, Neos Co., Ltd. manufactured by Fategent F-200, F251, Daikin Industries, Ltd. Unidyne DS-401, 402,
Examples include fluorine-based or silicone-based nonionic surfactants such as Florad FC-170 and 176 manufactured by 3M Co., Ltd., and a cationic surfactant, an anionic surfactant, and an amphoteric surfactant are used. You can also.

In the photocatalyst-containing layer, in addition to the above surfactants, polyvinyl alcohol, unsaturated polyester, acrylic resin, polyethylene, diallyl phthalate, ethylene propylene diene monomer, epoxy resin, phenol resin, polyurethane, melamine resin , Polycarbonate, polyvinyl chloride, polyamide, polyimide, styrene butadiene rubber, chloroprene rubber, polypropylene, polybutylene, polystyrene, polyvinyl acetate, polyester, polybutadiene, polybenzimidazole, polyacrylonitrile, oligomers such as epichlorohydrin, polysulfide, polyisoprene, A polymer or the like can be contained.

The content of the photocatalyst in the photocatalyst containing layer is 5 to 5.
It can be set in the range of 60% by weight, preferably 20 to 40% by weight. Further, the thickness of the photocatalyst-containing layer is 0.1 mm.
It is preferably in the range of 05 to 10 μm.

The photocatalyst-containing layer can be formed by dispersing a photocatalyst and a binder, if necessary, in a solvent together with other additives to prepare a coating solution, and applying the coating solution. As the solvent to be used, alcohol-based organic solvents such as ethanol and isopropanol are preferable. The coating can be performed by a known coating method such as spin coating, spray coating, dip coating, roll coating, and bead coating. When an ultraviolet-curable component is contained as a binder, the photocatalyst-containing layer can be formed by irradiating ultraviolet rays and performing a curing treatment.

(Pixel part) As shown in FIG. 1, the color filter of the present invention has a plurality of colors, usually red (R), green (G),
The pixel portion 3 is formed in which three colors of blue and blue (B) are provided in a predetermined pattern.

Here, the predetermined pattern is a pattern usually used in a color filter, and specific examples include a mosaic pattern, a triangle pattern, a stripe pattern and the like.

The ink-jet type ink for forming such a pixel portion is roughly classified into water-based and oil-based inks. In the present invention, any of these inks can be used. Water-based aqueous inks are preferred.

In the aqueous ink used in the present invention, water alone or a mixed solvent of water and a water-soluble organic solvent can be used as a solvent. On the other hand, oil-based inks based on high-boiling solvents are preferably used in order to prevent clogging of the head. Known pigments and dyes are widely used as the colorant used in such an ink-jet type ink. Further, a resin soluble or insoluble in a solvent may be contained for improving dispersibility and fixing property. In addition, surfactants such as nonionic surfactants, cationic surfactants, and amphoteric surfactants; preservatives; fungicides; pH adjusters; defoamers; ultraviolet absorbers; viscosity adjusters: surface tension adjusters; May be added as needed.

Further, ordinary inks of the ink jet system cannot contain a large amount of binder resin due to low suitable viscosity. However, by coloring the colorant particles in the ink into a resin and granulating it, the colorant itself has fixing ability. Can be made. Such an ink can also be used in the present invention. Further, a so-called hot melt ink or UV curable ink can be used.

In the present invention, it is particularly preferable to use a UV curable ink. By using a UV curable ink, after forming a pixel portion by coloring with an ink jet method, the ink can be quickly cured by irradiating UV, and can be immediately sent to the next step. Therefore, a color filter can be efficiently manufactured.

Such a UV curable ink contains a prepolymer, a monomer, a photoinitiator and a colorant as main components. As the prepolymer, polyester acrylate, polyurethane acrylate, epoxy acrylate, polyether acrylate, oligoacrylate, alkyd acrylate, polyol acrylate,
Any of prepolymers such as silicon acrylate can be used without any particular limitation.

Examples of the monomer include vinyl monomers such as styrene and vinyl acetate; monofunctional acrylic monomers such as n-hexyl acrylate and phenoxyethyl acrylate; diethylene glycol diacrylate, 1,6-hexanediol diacrylate, hydroxypiperate ester neopentyl Polyfunctional acrylic monomers such as glycol diacrylate, trimethylolpropane triacrylate, and dipentaerythrol hexaacrylate can be used. The above prepolymer and monomer may be used alone or in combination of two or more.

The photopolymerization initiator includes isobutyl benzoin ether, isopropyl benzoin ether, benzoin ethyl ether, benzoin methyl ether, 1-phenyl-1,2-propadion-2-oxime, 2,2-
Dimethoxy-2-phenylacetophenone, benzyl,
Hydroxycyclohexylphenyl ketone, diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, benzophenone, chlorothioxanthone, 2-chlorothioxanthone, isopropylthioxanthone, 2-methylthioxanthone, chlorine-substituted benzophenone, halogen-substituted Those which can obtain desired curing characteristics and recording characteristics can be selected and used from alkyl-allyl ketones and the like. In addition, if necessary, a photoinitiating auxiliary such as an aliphatic amine or an aromatic amine; a photosensitizer such as thioxanthone may be added.

In the method of forming such a pixel portion, first, as described above, pattern exposure is performed on the photocatalyst-containing layer so as to form a lyophilic region having the same pattern as the pattern of the pixel portion to be formed. Will be applied. Next, an ink for forming a pixel portion is applied to the lyophilic region by an inkjet method. Then, the pixel portion can be formed by curing the pixel portion forming ink.

(Others) The color filter of the present invention includes:
Other members may be formed as necessary, and specifically, a transparent electrode layer, an alignment layer, a protective layer, a columnar member functioning as a spacer, or the like may be formed.

2. Next, a method for manufacturing the color filter of the present invention will be described. The method for manufacturing a color filter according to the present invention includes: (1) a step of forming a light-shielding portion on a transparent substrate; and (2) unevenness on the surface of the transparent substrate on which the light-shielding portion is formed. (3) a step of forming a primer layer formed so as to be within the range of 10,000 °, and (3) containing at least a photocatalyst and a binder on the primer layer so that a contact angle with a liquid is reduced by energy irradiation. Providing a photocatalyst-containing layer that is a layer whose wettability changes; (4)
By pattern irradiation of energy on this photocatalyst containing layer,
It is characterized by having at least a step of forming an exposure section for a pixel section, and (5) a step of forming a pixel section by adhering ink to the exposure section for a pixel section by ink jetting. Hereinafter, each of the above steps will be described.

FIG. 2 is a view for explaining each step in an example of the method for manufacturing a color filter of the present invention.
In this example, first, the transparent substrate 1 is formed by a conventional method.
The light-shielding portion 2 is formed thereon (FIG. 2A). This light shielding part 2
The production method is not particularly limited. For example, as described above, a metal thin film of chromium or the like having a thickness of about 1000 to 2000 ° is formed by a sputtering method, a vacuum evaporation method, or the like, and is formed by patterning the thin film. Methods and the like can be mentioned. The obtained light-shielding portion is the same as the light-shielding portion described in the section of the color filter, and the description is omitted here.

Next, a primer layer 9 which is a feature of the present invention is formed on the transparent substrate 1 on which the light shielding portion 2 is formed so as to cover the light shielding portion 2 and the transparent substrate 1. This primer layer prepares a coating liquid for forming a primer layer,
It can be formed by applying this on the transparent substrate and the light-shielding portion and curing it. The method of applying the primer layer-forming coating liquid is not particularly limited as long as the primer layer surface can be flattened as quickly as possible.Specifically, spin coating, spray coating,
The coating can be performed by a known coating method such as dip coating, roll coating, and bead coating. The coating liquid for forming a primer layer applied in this manner is cured by a curing method according to the type of the coating liquid, specifically, by irradiating ultraviolet rays or heating. Note that the viscosity of the primer layer coating liquid used here is preferably as low as possible from the viewpoint that unevenness of the light shielding portion 2 can be quickly flattened.

The primer layer thus formed has a surface unevenness in the range of ± 10000 °, preferably ± 10000 °, for the reason described in the section of the color filter.
It must be formed so as to be within the range of 5000 °, particularly preferably ± 2000 °.

Next, a photocatalyst-containing layer 3 is formed on the surface of the primer layer (FIG. 2C). The photocatalyst containing layer 3 is formed by dispersing the photocatalyst and the binder as described above in a solvent together with other additives as necessary to prepare a coating solution, applying the coating solution, and then subjecting the coating solution to hydrolysis, It is formed by advancing the polycondensation reaction to firmly fix the photocatalyst in the binder. The solvent used is preferably an alcoholic organic solvent such as ethanol or isopropyl alcohol, and the coating can be performed by a known coating method such as spin coating, spray coating, dip coating, roll coating, or bead coating. In the present invention, since the primer layer is formed, the surface on which the photocatalyst-containing layer is formed is relatively flat, and it is possible to form a photocatalyst-containing layer having a uniform thickness.

The transparent substrate 1 on which the photocatalyst containing layer 3 having a uniform thickness is formed is irradiated with energy 10 such as ultraviolet light by a photomask 4 in a pattern. As a result, a pixel portion exposed portion for forming the pixel portion formation 5 on the photocatalyst containing layer 3 where the pixel portion is formed as a lyophilic region by the action of the photocatalyst in the photocatalyst containing layer 2 is formed. FIG. 2 (d)). The type of pattern irradiation is not limited to the one using a photomask, but may be the one using drawing irradiation using a laser or the like.

The ink 7 for forming the pixel portion is jetted into the lyophilic pixel portion forming portion 5 by using an ink-jet device 6 or the like so as to be colored red, green, and blue, respectively. (FIG. 2 (e)). At this time, since the inside of the pixel portion forming portion 5 is a lyophilic region having a small contact angle with the liquid due to the exposure as described above, the pixel portion forming ink 7 ejected from the ink jet device 6 It spreads uniformly in the forming part 5. In addition, since the region of the photocatalyst containing layer 3 that has not been exposed is a liquid repellent region, the ink is repelled and removed in this region. At this time, as described above, since the photocatalyst-containing layer 3 has a uniform film thickness, the liquid-repellent region between the pixel portion forming portions 5 may be lost, causing a problem such as color mixing. Less is.

The ink-jet device used in the present invention is not particularly limited, but includes a method of continuously ejecting charged ink and controlling it by a magnetic field, and a method of intermittently ejecting ink using a piezoelectric element. Alternatively, an ink jet apparatus using various methods such as a method in which ink is heated and intermittently ejected by utilizing foaming thereof can be used.

Thus, the pixel portion 8 is formed by solidifying the ink adhered in the pixel portion forming portion 5 (FIG. 2 (f)). In the present invention, the solidification of the ink is performed by various methods depending on the type of the ink used. For example, in the case of a water-soluble ink, the water is removed by heating or the like to be solidified.

In consideration of the ink solidification step, the type of ink used in the present invention is preferably a UV curable ink. This is because the UV curable ink can quickly solidify the ink by irradiating the UV, so that the manufacturing time of the color filter can be shortened.

As described above, the photocatalyst containing layer 3 of the present invention
Is formed on the primer layer 9 so that it is formed uniformly over the entire surface and has no defective portion. Therefore, unlike a conventional color filter without the primer layer 9, there is no possibility that a defect such as color mixing of a pixel portion in a defective portion of the photocatalyst containing layer occurs, and a high quality color filter can be obtained.

3. Color liquid crystal display device A color liquid crystal display device is formed by combining the thus obtained color filter with a counter electrode substrate facing the color filter and sealing a liquid crystal compound therebetween. The color liquid crystal display device thus obtained has an advantage of the color filter of the present invention, that is, a high display quality without color mixing or the like in the pixel portion.

The present invention is not limited to the above embodiment. The above embodiment is an exemplification, and has substantially the same configuration as the technical idea described in the scope of the claims of the present invention. It is included in the technical scope of the invention.

For example, in the above description, the wettability of the photocatalyst-containing layer is changed by exposure. However, the term “exposure” used herein does not indicate only visible light exposure, It is meant to include all the irradiation of energy that can change the wettability.

For example, when the photocatalyst in the photocatalyst-containing layer is titanium oxide, the light contains ultraviolet light. Examples of the light source containing such ultraviolet light include mercury lamps, metal halide lamps, xenon lamps, and the like. Excimer lamps and the like can be mentioned. Further, the photocatalyst containing layer may be exposed by applying a photocatalytic reaction start energy to the photocatalyst containing layer and applying a reaction rate increasing energy to a region where the photocatalytic reaction start energy is added. The photocatalytic reaction initiation energy in this case is not particularly limited as long as it is an energy capable of initiating the photocatalytic reaction, but is preferably light including ultraviolet light that initiates the catalytic reaction of titanium dioxide. . Specifically, a range of 400 nm or less, preferably 380 n
Light containing ultraviolet light in the range of m or less is preferred. Also,
It is preferable to use thermal energy as the energy for increasing the reaction rate. Examples of a method for applying such thermal energy include a method using an infrared laser and a method using a thermal head.

[0103]

According to the present invention, since a primer layer is formed on a transparent substrate on which a light-shielding portion is formed so that the surface irregularities are within a predetermined range, the primer layer is formed thereon. The photocatalyst containing layer can be formed to have a uniform thickness. Therefore, there is a problem in forming the photocatalyst-containing layer directly on the light-shielding portion, that is, since the photocatalyst-containing layer cannot be formed according to the unevenness of the light-shielding portion, the color mixture of the pixel portion is not formed on the light-shielding portion without the photocatalyst-containing layer being formed. It is possible to provide a color filter of good quality without any trouble such as occurrence.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of a color filter of the present invention.

FIG. 2 is a schematic sectional view illustrating an example of a method for manufacturing a color filter of the present invention.

FIG. 3 is a schematic sectional view illustrating an example of a conventional method for manufacturing a color filter.

FIG. 4 is a schematic cross-sectional view illustrating an example of a conventional color filter manufacturing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Transparent substrate 2 ... Light shielding part 3 ... Photocatalyst containing layer 6 ... Ink jet apparatus 7 ... Ink for pixel part formation 8 ... Pixel part 9 ... Primer layer 10 ... Energy

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H048 BA02 BA11 BA64 BA66 BB01 BB02 BB10 BB14 BB22 BB28 BB44 2H091 FA02Y FA35Y FB04 FB08 FC02 FC23 4G069 AA03 BA02B BA04A BA04B BA14B BA48A BB04A BB06A02 BC12 BC12A DL021 DL031 DL051 DL071 DL081 DL091 DL121 HA216 KA06 PB08 PC08

Claims (10)

[Claims] 1. A transparent substrate, a light-shielding portion provided on the transparent substrate at a boundary portion of a pixel portion, and a light-shielding portion formed on the transparent substrate and having irregularities of ± 10 on the transparent substrate.
A primer layer formed so as to be within the range of 000 °, and formed on the primer layer and containing at least a photocatalyst and a binder, and the wettability changes so that the contact angle with the liquid is reduced by exposure. A color filter, comprising: a photocatalyst-containing layer as a layer; and a pixel portion in which a plurality of colors are formed on the photocatalyst-containing layer in a predetermined pattern determined by a position between the light-shielding portions by an inkjet method. 2. The color filter according to claim 1, wherein the primer layer has a thickness within a range of ± 50% based on the thickness of the light shielding portion. 3. The color filter according to claim 1, wherein the width of the pixel portion is larger than the width of an opening formed by the light shielding portion. 4. The photocatalyst comprises titanium oxide (Ti)
O ₂ ), zinc oxide (ZnO), tin oxide (SnO ₂ ), strontium titanate (SrTiO ₃ ), tungsten oxide (WO ₃ ), bismuth oxide (Bi ₂ O ₃ ), and iron oxide (Fe ₂ O ₃ ) The color filter according to any one of claims 1 to 3, wherein the color filter is at least one substance selected from the group consisting of: 5. The color filter according to claim 4, wherein said photocatalyst is titanium oxide (TiO ₂ ). 6. The method according to claim 1, wherein the binder is Y _n SiX _(4-n) (where Y is an alkyl group, a fluoroalkyl group, a vinyl group,
X represents an amino group, a phenyl group or an epoxy group, and X represents an alkoxyl group or a halogen. n is an integer from 0 to 3. 6. An organopolysiloxane which is one or more hydrolytic condensates or co-hydrolytic condensates of a silicon compound represented by the formula (1). The color filter according to 1. 7. A surface tension 4 on the photocatalyst containing layer.
The contact angle with a liquid of 0 mN / m is 1 in a region not irradiated with energy compared to a region irradiated with energy.
The color filter according to any one of claims 1 to 6, wherein the color filter is greater than or equal to degrees. 8. A process of (1) forming a light-shielding portion on a transparent substrate, and (2) forming a surface of the transparent substrate on a side where the light-shielding portion is formed, with a surface irregularity of ± 10000 °. A step of forming a primer layer formed so that
(3) providing, on the primer layer, a photocatalyst-containing layer that contains at least a photocatalyst and a binder, and that changes the wettability so that the contact angle with a liquid is reduced by energy irradiation; A step of forming an exposed portion for a pixel portion by pattern irradiation of energy on the photocatalyst-containing layer, and (5) a step of forming a pixel portion by applying ink to the exposed portion for a pixel portion by an ink jet method. A method for manufacturing a color filter, comprising: 9. The method according to claim 8, wherein the energy applied to the photocatalyst-containing layer is light including ultraviolet light. 10. A color filter according to claim 1 and a substrate facing the color filter, wherein a liquid crystal compound is sealed between the two substrates. Color liquid crystal display device.