JPH10197718A - Production of color filters for liquid crystal display, color filters for liquid crystal display and liquid crystal panel including these color filters - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to easily form black matrices and colored pixel parts and to improve the characteristics required as color filters by immersing a substrate formed with the colored pixel parts into black ink, thereby forming light shielding parts. SOLUTION: An ink absorptive resin layer 2 is formed on a transparent substrate 1 and photosetting inks of red, green and blue (R, G, B) contg. a photosetting resin compsn. are discharged onto the transparent substrate 1 by using an ink jet recorder, by which the colored pixels are formed. The photosetting resin compsn. is exposed via a photomask 4 and is cured to fix the color materials, by which the colored pixel parts 5 are formed. The substrate 1 is immersed into the photosetting black ink in which the photosetting resin compsn. similar to the photosetting resin compsn. of the R, G, B inks and a black coloring agent, such as carbon black, are incorporated to have the black ink absorbed in the ink absorptive resin layers 2 of the region exclusive of the colored pixel parts 5. For example, the entire surface of the transparent substrate 1 is exposed to cure the photosetting resin compsn. in the black ink, by which the black light shielding parts 7 are formed between the colored pixel parts 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a color filter for a color liquid crystal display used for a color television, a personal computer, etc., and more particularly to a method for manufacturing a color filter for a liquid crystal display using an ink jet recording technique. The present invention relates to a color filter for liquid crystal display manufactured by the method, and a color liquid crystal panel including the color filter.

[0002]

2. Description of the Related Art In recent years, the research and development of liquid crystal display panels has been steadily expanding, and the market for liquid crystal display panels has been greatly expanded. The components that make up a liquid crystal display panel can be broadly divided into
Polarizing plate, glass substrate, alignment film, liquid crystal material, spacer,
Although color filters are divided into color filters, etc., the percentage of the price occupied by these filters is relatively expensive, and the reduction of the production cost of color filters is a key point in providing a reasonably priced liquid crystal display panel. It is said that there is. For this reason, various methods have been heretofore attempted to produce an inexpensive color filter while satisfying the characteristics required for a color filter.

[0003] Here, the color filter is composed of a large number of picture elements each having three primary color pixels of red (R), green (G) and blue (B) formed on a transparent substrate. .
In general, a light-shielding region having a certain width is provided between pixels having different colors in order to increase display contrast. Usually, this light-shielded region is called black matrix because it is black.

[0004] As for the method of producing a color filter, a coloring method for coloring a colored pixel portion is performed by dyeing a dyeable medium formed by using a photolithography technique, and a photosensitive composition in which a pigment is dispersed is used. In addition to the pigment dispersion method used, the electrodeposition method using a patterned electrode, and the like, there is a method of forming a colored portion by an inkjet recording method as a low-cost manufacturing method.

[0005] Can provide color filters at low cost
How to make a color filter using the inkjet method
As the method, for example, JP-A-59-75205,
JP-A-63-294503, JP-A-2-1562
No. 02 and the like. Immediately
JP-A-59-75205 discloses that a glass substrate
To prevent the color material from spreading out of the desired colored area.
Substances that have poor wettability to the coloring material on the glass substrate
To form a diffusion prevention pattern with a glass substrate
By forming a pattern on the
It is described that the color material is fixed only in the coloring area.
ing.

[0006] Further, Japanese Patent Application Laid-Open No. 63-294503 discloses
Form a colorable layer in advance on a glass substrate
Ink jet at a desired position on the surface of the layer to be colored.
Ink is ejected by the recording method, and a predetermined dye is
A method of dyeing a desired position of the layer to be colored by diffusion has been developed.
It is shown. Further, Japanese Patent Laid-Open No. 2-156202 discloses
Has a black matrix pattern on a transparent substrate
After forming the black matrix pattern,
Active diffusion in the other areas.
Inkjet recording method using energy ray curable ink
The desired color area is colored by discharging the ink according to the following formula.
Irradiate after-light to cure the ink, fix the colorant, and
A method for forming a turn-shaped colored pixel portion is shown.

On the other hand, as a method of forming a black matrix for preventing color mixing, a chromium film is generally formed on the entire surface of a substrate by a method such as vacuum evaporation or sputtering.
Apply a photosensitive resist, expose and develop, etch,
A black matrix is formed by leaving a chromium film only in a necessary portion after resist stripping. However, such a method requires expensive vacuum equipment and resist, and requires complicated steps such as resist coating, exposure / development, baking, etching, and resist peeling, and thus has a problem that the production cost is high. In addition, the conventional method requires extremely high precision for the alignment between the black matrix and the colored pixel portion, and this also requires considerable manufacturing costs.

As a method for simply forming a black matrix, for example, Japanese Patent Application Laid-Open No. 5-297221 discloses a method of forming a three-primary-color pixel pattern using inks having red, green, and blue coloring materials (hereinafter also referred to as coloring agents). Is formed on a transparent substrate, and then a material for forming a photosensitive dyeable medium is applied thereon, and selectively exposed and developed from the back side of the substrate, and the dyeable dye is formed only between the colored pixel portions. Medium layer (ink absorption layer)
Is formed, the substrate is immersed in a black ink tank, and the dyeable medium layer is dyed to form a light-shielding portion. However, in this method, since the ink absorption layer is formed on the three primary color pixel patterns, color mixing may occur between the pixels, and there is a manufacturing restriction because the exposure and development must be performed from the back side of the substrate. Was.

[0009]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, wherein a black matrix and a colored pixel portion are formed by a simple method, and the required characteristics as a color filter are obtained. Excellent,
In particular, it is an object of the present invention to provide a method for producing a color filter capable of obtaining a liquid crystal display color filter having excellent color characteristics without color mixture, a liquid crystal display color filter produced by the method, and a color liquid crystal panel using the color filter. It is in. Further, an object of the present invention is to provide a color liquid crystal panel at a reasonable price to which the color filter is applied by developing a manufacturing method capable of reducing the manufacturing cost and providing an inexpensive color filter. It is in.

[0010]

The above object is achieved by the present invention described below. That is, the present invention provides a process of forming colored pixel portions of three primary colors of red, green and blue on the surface of a light-transmitting substrate, and immersing the substrate having the colored pixel portions formed in black ink performed thereafter. Forming a light-shielding portion by performing the method, a method of manufacturing a color filter for a liquid crystal display, a color filter manufactured by the method, and a color liquid crystal panel including the color filter.

[0011]

Next, the present invention will be described in more detail with reference to preferred embodiments. The method of manufacturing a color filter of the present invention includes the steps of forming colored pixel portions of three primary colors of red, green and blue on the surface of the light-transmitting substrate, and forming the colored pixel portions in black ink performed thereafter. And forming a light-shielding portion by immersing the substrate in the substrate. The preferred method of the present invention includes the following method.

First, as a first method, a photocurable ink containing at least a photocurable resin composition is discharged by an ink jet recording apparatus on a transparent substrate on which an ink absorbing resin layer is formed in advance. After arranging the colored pixels, after forming the colored pixel portion by curing the ink by exposing the entire substrate or a predetermined pattern,
After immersing the substrate in a photocurable black ink containing at least a photocurable resin composition to form a black portion in a region other than the colored pixel portion, the substrate is exposed to light to cure the black portion and shield light. And a method of forming the portion.

As a second method, the same photocurable resin composition as used as a component of the ink in the first method described above is used, and of the components constituting the composition, An ink-absorbing resin containing at least one low-molecular-weight material or one component thereof is previously coated on a transparent substrate, and a photo-curable resin composition is formed on the transparent substrate using an inkjet recording apparatus. By arranging desired colored pixels by discharging ink containing at least a material and a colorant comprising the remaining components constituting the above, all the components of the photocurable resin composition are mixed on the substrate, and then A colored pixel portion is formed by curing the photocurable resin by exposing the entire substrate or the colored pixel portion in a predetermined pattern, and thereafter, the substrate on which the colored pixel portion is formed is contained in the ink. ing Immerse in a photocurable black ink having the same constituent material of the photocurable resin composition to form a black portion in a region other than the colored pixel portion, and then cure the black portion by exposure to form a light-shielding portion. Forming method.

Further, as a third method, an ink-absorbing resin composition containing at least one of two or more kinds of resin raw materials composed of two or more materials which react and crosslink by mixing, or one such material is used. An object is applied in advance on a transparent substrate, and an ink containing another type of resin material and a colorant is ejected onto the transparent substrate by using an ink jet recording apparatus to apply the desired colored pixel. By arranging, after mixing all of the above resin raw materials on the substrate, and reacting and cross-linking these raw materials to form a colored pixel portion, the substrate on which the colored pixel portion is formed is placed in the ink. By immersing in a black ink having the same resin material as that contained in the resin material, all of the resin material is mixed in a region other than the colored pixel portion, and these materials react and crosslink to form a black portion. Way And the like.

Hereinafter, a method of manufacturing a color filter for a liquid crystal display according to the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a method for manufacturing a color filter according to the first method described above. In the figure, 1 is a transparent substrate,
Reference numeral 2 denotes an ink absorbing resin layer, 3 denotes an inkjet head, 4 denotes a photomask, 5 denotes a colored pixel portion, 6 denotes a black ink, 7 denotes a light shielding portion, and 8 denotes a protective film.

First, as shown in FIG. 1A, an ink-absorbing resin is applied on a transparent substrate 1 and pre-baked as necessary to form an ink-absorbing resin layer 2 on the transparent substrate in advance. . At this time, a glass substrate is generally used as the transparent substrate 1. In the present invention, a glass substrate is used as a substrate for a color filter as long as it has necessary characteristics such as transparency and mechanical strength. The invention is not limited thereto, and a transparent plastic substrate or the like may be used.

Examples of the ink-absorbing resin used above include cellulose derivatives such as polyvinyl alcohol, polyvinylpyrrolidone and hydroxypropyl cellulose, and water-soluble acrylic resins. As a method for applying the ink-absorbing resin on the transparent substrate, any method may be used as long as it can be uniformly applied to a desired film thickness. For example, spin coating, roll coating, bar coating, dip coating, etc. Coating method.

Next, as shown in FIG. 1B, using an ink jet recording apparatus, at least a red light containing a photocurable resin composition is formed on the transparent substrate 1 on which the ink absorbing resin layer 2 is formed. (R), green (G) and blue (B) photo-curable inks are ejected to form colored pixels. The photocurable resin composition used in this case includes, for example, photopolymerizable oligomers such as epoxy acrylate, urethane acrylate, polyester acrylate, and polyether acrylate, and monofunctional acrylates, which are cured by irradiation with ultraviolet rays or electron beams. And a photopolymerizable compound such as a photopolymerizable monomer such as a polyfunctional acrylate and a photopolymerization initiator such as a benzoin-based, acetophenone-based, thioxanthone-based, and peroxide-based photopolymerization initiator. The present invention is not limited only to these.

Examples of the ink used in this case include, for example, inks prepared from inks of RGB using monoazo, disazo, phthalocyanine, etc. dyes or pigments as coloring materials. . Further, when used for a liquid crystal display, it is preferable to use an ink having good light resistance since the light of the backlight is applied. For example, in the present invention, it is preferable to use an organic pigment-based ink in which an organic pigment is dispersed in a liquid medium containing a desired organic solvent with a dispersant, but the present invention is not limited thereto.

The ink jet head of the ink jet recording apparatus suitably used in the above case includes a bubble jet type using an electrothermal converter as an energy generating element, a piezo jet type using a piezoelectric element, and the like. That is, by using such a type of inkjet head, it is possible to easily and accurately apply ink of a desired color to a desired position by arbitrarily setting a coloring area and a coloring pattern.
The colored pixel pattern of the color filter can be easily formed.

Next, exposure is performed on the entire surface of the substrate on which the colored pixels 5 are arranged, or via a photomask 4 having a predetermined pattern (see FIG. 1C). The coloring material portion 5 is formed by curing the resin composition and fixing the coloring material in the ink. The entire substrate may be exposed, but in this case, if the ink enters the area of the ink-absorbing resin layer 2 other than the colored pixel portion, the photocurable resin composition in the ink is also cured. Therefore, the present invention is preferably applied to the case where the precision of the formed colored pixel pattern does not require much precision.

Next, as shown in FIG. 1D, the substrate 1 on which the colored pixel portions 5 are formed is made of the same photocurable resin composition and carbon black as those used as the components of the RGB ink. It is immersed in a photocurable black ink 6 containing a black colorant, and the black ink is absorbed by the ink-absorbing resin layer 2 in a region other than the colored pixel portion 5.

Next, after pulling up the transparent substrate 1 from the black ink 6, the entire surface of the transparent substrate 1, for example, is exposed to cure the photo-curable resin composition in the black ink, and the colored pixel portion 5 is cured. A black light-shielding portion 5 is formed between them (FIG. 1 (e)).
reference).

Next, as shown in FIG. 1G, a protective layer 8 is formed thereon as required. As a material for forming the protective layer 8, a resin material of a photo-curing type, a thermo-setting type, or a combination of light and heat, an inorganic film formed by vapor deposition, sputtering, or the like can be used. In particular, when a color filter is used, any color filter can be used as long as it can withstand the ITO film forming process and the alignment film forming process in the subsequent steps without impairing the transparency. Specifically, for example, a bisphenol A type epoxy resin, which is a two-part type thermosetting resin, and dicyandiamide, which is a curing agent, may be mentioned. As a method for forming the protective layer 8, for example, a coating method such as spin coating, roll coating, bar coating, or dip coating is used.

Next, the above-mentioned second method suitable for the present invention will be described below. In the second method of the present invention, instead of applying the ink-absorbing resin composition performed in the step of FIG. 1A of the first method on a transparent substrate, the components of the ink are formed by the first method. The same photocurable resin composition as used in Example 1 is used. Then, at least one of the low molecular weight materials among the components constituting the photocurable resin composition is used.
The same ink-absorbing resin as used in the first method containing the seed or one kind of the component is applied on a transparent substrate in advance.

In the second method, an ink containing a component material consisting of the remaining components other than the above components and a colorant, which constitutes the photocurable resin composition, and a colorant are used, and the ink is discharged by an ink jet recording apparatus. Applied on a transparent substrate,
The colored pixels are arranged so that all components of the photocurable resin composition are mixed on the substrate. Thereafter, the photocurable resin composition is cured by exposing the entire substrate or the colored pixel portion in a predetermined pattern to fix the coloring agent, thereby forming a colored pixel portion (see FIGS. 1B and 1C). ).

In the second method, when the light shielding portion is formed, the above-described RGB is used as a component of the black ink.
By using the same constituent material of the photocurable resin composition as contained in the ink, and immersing the substrate in this black ink, all of the photocurable resin composition in the region other than the colored pixel portion And then exposing the entire surface of the substrate, for example, to cure the photocurable resin composition to form a light-shielding portion. With the above-described material configuration, the curing time of the photocurable resin composition in the ink can be shortened, and the pot life of the ink material can be prolonged, so that stable production can be achieved.

The low molecular weight material which is a component of the photocurable resin composition suitably used in the above case includes, for example, photopolymerizable oligomers such as epoxy acrylate, urethane acrylate, polyester acrylate, and polyether acrylate; And monofunctional acrylates and polyfunctional acrylates, and photopolymerization initiators such as benzoin, acetophenone, thioxanthone, and peroxide. The term "at least one of these" refers to, for example, the photopolymerizable oligomer or the photopolymerizable monomer described above, or a mixture thereof, but is not limited thereto.

Further, the case of the above-mentioned third method suitable for the present invention will be specifically described. In the third method of the present invention, unlike the first and second methods, without using the photocurable resin composition, instead of the composition, two or more kinds which react and crosslink when mixed are mixed. Use resin material. And at least one of these resin raw materials is used.
After applying the seed or a material containing one of them on a transparent substrate in advance, the ink mounted on the ink jet recording apparatus and the black ink for immersing the base material contain another kind of resin material together with a colorant. Only when these inks are applied on the transparent substrate, all the resin raw materials are mixed and the resin reacts and cures. As a result, in the third method, unlike the first and second methods,
The colored pixel portion and the light-shielding portion can be formed more easily without an exposure operation or a heating operation. That is, by mixing these resin raw materials as appropriate, two or more kinds of resin raw materials are reacted and cross-linked and cured,
The coloring agent is fixed to the colored pixel portion and the light shielding portion.

Examples of the resin used in the above, which reacts and crosslinks when mixed, include thermosetting resins such as unsaturated polyester resins and epoxy resins.
Examples of the resin raw material of more than one kind include, for example, a combination of an epoxy resin and a curing agent, a constituent raw material of an unsaturated polyester resin, an unsaturated dicarboxylic acid such as maleic acid or fumaric acid, ethylene glycol, propylene glycol,
Examples include dihydric alcohols such as di- or triethylene glycol. That is, the epoxy resin is crosslinked by being mixed with a curing agent to become a thermosetting resin having various performances. Also, when the unsaturated dicarboxylic acid and the dihydric alcohol are mixed, they undergo polycondensation to form a liquid unsaturated polyester resin. This liquid unsaturated polyester resin is easily copolymerized by heating or an initiator, crosslinked, and made three-dimensional.

FIG. 2 is a schematic sectional view showing an example of a TFT color liquid crystal panel incorporating the color filter of the present invention manufactured by the above method. Note that the present invention is not limited to this. In general, a TFT color liquid crystal panel is composed of a substrate on a color filter side and a TFT.
It is formed by fitting the side substrates and sealing the liquid crystal compound between these substrates.

In the color liquid crystal panel shown in FIG. 2, a liquid crystal compound 11 is sealed between a color filter side substrate A on which the color filter of the present invention is disposed and a TFT side substrate B facing the substrate. ing. A TFT (not shown) and a transparent pixel electrode 1 are provided inside the TFT side substrate B.
2 are formed in a matrix. On the other hand, on the inside of the substrate A, the color filter of the present invention is arranged so that pixel portions colored with RGB are arranged at positions facing the pixel electrodes 12, and a transparent common electrode 9 is provided thereon. Formed on one side. Further, alignment films 10 and 10 'are formed inside the substrates A and B, respectively. Alignment film 1
0 and 10 'align the liquid crystal molecules in a certain direction by rubbing.

The polarizing films 11 and 11 'are adhered to the outside of the transparent substrates 1 and 1'. The liquid crystal compound 13 is filled between the color filter side substrate A and the TFT side substrate B (2 to 5 μm).
As a backlight, a direct type or a side light type combining a cold cathode tube (not shown) and a scattering plate (not shown) is generally used. An image is displayed by functioning as an optical shutter for changing the transmittance of the light.

[0034]

EXAMPLES Next, the present invention will be described more specifically with reference to examples, but the present invention is not limited to the following examples. The following colorants were used. Each color pigment used: Cyan (pigment name: CI Pigment Blue)
e) magenta (pigment name: CI Pigment Re)
d) Yellow (pigment name: CI Pigment Yel)
low) Black (pigment name: carbon black)

Example 1 First, an ink-absorbing resin composition comprising the following (1) and (2) was applied on a glass substrate by spin coating so as to have a dry film thickness of 1 μm. An ink-absorbing resin layer was formed on the substrate (see FIG. 1A). (1) 10 parts by weight of a terpolymer of N-methylolacrylamide, methyl methacrylate and hydroxyethyl methacrylate (monomer composition ratio = 20: 30: 50) (2) triphenylsulfonium trifluoromethylsulfonate (Midori Chemical Co., Ltd.) TSP-105: acid generator) 0.2 parts by weight

Next, using an ink jet recording apparatus, a photocurable ink having the following composition was discharged to arrange colored pixel patterns (see FIG. 1B). -40% by weight of polyester acrylate-40% by weight of dipentaerythritol hexaacrylate-5% by weight of 1-hydroxycyclohexylphenyl ketone-15% by weight of each pigment Pre-baking was performed for 15 minutes. Thereafter, the substrate surface was exposed through a photomask at an exposure amount of 300 mJ / cm ² to cure the photocurable ink, thereby forming a colored pixel portion on a transparent substrate.

Thereafter, the substrate on which the colored pixel portion was formed was immersed in a tank containing black ink in which the pigment in the composition of the photocurable ink used above was replaced with carbon black. As a result, the black ink was absorbed by the ink absorbing resin layer other than the portion where the colored pixel portion was formed. Next, the substrate is pulled up from the black ink tank and prebaked at 100 ° C. for 15 minutes as in the case of forming the colored pixel portion, and then exposed at an exposure amount of 300 mJ / cm ² to fix the black ink. Thus, a light shielding portion was formed.

Further, a urethane-modified polyester acrylate, which is a two-component thermosetting resin, is spin-coated thereon so that the cured film thickness becomes 1 μm.
The protective layer was formed by performing a heat treatment at a temperature of 1 ° C. for 1 hour to cure the composition. When the color filter for liquid crystal display produced as described above was observed with an optical microscope, no color mixture was observed between colored pixel portions having different colors.

Example 2 First, 50% by weight of urethane acrylate (photopolymerizable oligomer) as a photocurable resin composition was placed on a glass substrate.
And a mixture of 50 wt% of trimethylolpropane triacrylate (photopolymerizable monomer) with a dry film thickness of 0.6 μm
m (see FIG. 1A). Next, an ink containing at least α, α-dimethoxy-α-phenylacetophenone, which is a photopolymerization initiator, and a pigment is ejected thereon using an ink jet recording apparatus to arrange the colored pixel patterns. I let it.

Next, the colored pixels on the transparent substrate were formed in Example 1.
In the same manner as described above, pre-baking is performed at 100 ° C. for 15 minutes, and then the base material surface is exposed through a photomask with an exposure amount of 300 mJ / cm ² , and further heat treatment is performed at 200 ° C. for 30 minutes. Then, the ink was cured to form a colored pixel portion. After that, the transparent substrate on which the colored pixel portion is formed is coated with α,
It was immersed in a black ink tank having α-dimethoxy-α-phenylacetophenone and carbon black. As a result, the black ink was absorbed in the area of the ink absorbing resin layer other than where the colored pixel portion was formed. After that, the substrate is pulled up from the black ink tank, pre-baked at 100 ° C. for 15 minutes in the same manner as in the case where the colored pixel portion is formed, and then exposed at an exposure amount of 300 mJ / cm ² ,
Heat treatment was performed at 0 ° C. for 30 minutes to fix the black ink and form a light-shielding portion.

Further, a urethane-modified polyester acrylate, which is a two-component thermosetting resin, is spin-coated on the entire surface of the substrate so as to have a cured film thickness of 1 μm.
The protective layer was formed by performing a heat treatment at a temperature of 1 ° C. for 1 hour to cure the composition. As a result of observing the produced liquid crystal color filter with an optical microscope as described above, no color mixture was observed.

Example 3 First, 30 wt% of polyester acrylate (photopolymerizable oligomer) and 70 wt% of dipentaerythritol hexaacrylate (photopolymerizable monomer) were placed on a glass substrate.
Of the following (1) and (2) containing 50% of a mixture of the above is applied so as to have a dry film thickness of 1.0 μm, and the ink-absorbing resin is applied on a glass substrate. A layer was formed (see FIG. 1A). (1) 10 parts by weight of a terpolymer of N-methylolacrylamide, methyl methacrylate and hydroxyethyl methacrylate (monomer composition ratio = 20: 30: 50) (2) triphenylsulfonium trifluoromethylsulfonate (Midori Chemical Co., Ltd.) TSP-105: acid generator) 0.2 parts by weight

Next, an ink containing at least 1-hydroxycyclohexyl phenyl ketone, which is a photopolymerization initiator, and various pigments is discharged using an ink jet recording apparatus to arrange the colored pixel patterns. I let it. Next, the colored pixels on the transparent substrate were prebaked at 100 ° C. for 15 minutes in the same manner as in Example 2, and then exposed at an exposure amount of 300 mJ / cm ² ,
The ink was cured by performing a heat treatment at 0 ° C. for 30 minutes to form a colored pixel portion.

Thereafter, the transparent substrate on which the colored pixel portions were formed was immersed in a black ink tank containing 1-hydroxycyclohexylphenyl ketone having the same components as those used in the ink and carbon black. As a result, the black ink was absorbed in the area of the ink absorbing resin layer other than where the colored pixel portion was formed. Thereafter, the substrate is pulled out of the black ink tank, pre-baked at 100 ° C. for 15 minutes in the same manner as in the case of forming the colored pixel portion, and then exposed at an exposure amount of 300 mJ / cm ² , and further exposed to light for 20 minutes.
Heat treatment was performed at 0 ° C. for 30 minutes to fix the black ink and form a light-shielding portion.

Further, a urethane-modified polyester acrylate, which is a two-component thermosetting resin, was spin-coated on the entire surface of the substrate so as to have a cured film thickness of 1 μm.
The protective layer was formed by performing a heat treatment at a temperature of 1 ° C. for 1 hour to cure the composition. As a result of observing the produced liquid crystal color filter with an optical microscope as described above, no color mixture was observed.

Example 4 First, a bisphenol A type epoxy resin having a dry film thickness of 1.0 μm was used as at least one of two or more kinds of resin raw materials which reacted and crosslinked by being mixed on a glass substrate. (Fig. 1)
(A)). Next, on top of this, by using an inkjet recording apparatus, by discharging ink having metaphenylenediamine and various pigments as a curing agent for epoxy resin, the epoxy resin and metaphenylenediamine are mixed on the substrate, The epoxy resin was cured by the reaction and crosslinking to form a colored pixel portion in which three colors of RGB were arranged in a pattern.

Thereafter, the substrate on which the colored pixel portion was formed was immersed in a black ink tank containing metaphenylenediamine and carbon black. When the substrate was lifted from the black ink tank, the epoxy resin and metaphenylenediamine were mixed, and the reaction
The non-colored pixel portion region was cured by crosslinking, and a light-shielding portion was formed. Further, a urethane-modified polyester acrylate, a two-component thermosetting resin, is spin-coated on the entire surface of the substrate so as to have a cured film thickness of 1 μm, and is cured by heat treatment at 230 ° C. for 1 hour. A layer was formed.
When the color filter for liquid crystal produced without performing light irradiation or heat treatment as described above was observed with an optical microscope, no color mixture was observed as in the case of Examples 1 to 3.

Example 5 First, a mixture of an ink-absorbing resin composition composed of hydroxypropylcellulose and methylolchloramine and a bisphenol A type epoxy resin similar to that used in Example 4 was dried on a glass substrate. It was applied by spin coating to a thickness of 1 μm (see FIG. 1A). Next, by using an ink jet recording apparatus, an ink having metaphenylenediamine and a variety of pigments as a curing agent for the epoxy resin is ejected on the substrate, the epoxy resin and the metaphenylenediamine are mixed on the substrate. Then, the epoxy resin was cured by reaction and crosslinking to form a colored pixel portion in which three colors of RGB were arranged.

Thereafter, the substrate on which the colored pixel portion was formed was immersed in a black ink tank containing metaphenylenediamine and carbon black. When the substrate was lifted from the black ink tank, the epoxy resin and metaphenylenediamine were mixed, and the reaction
The non-colored pixel portion region was cured by crosslinking, and a light-shielding portion was formed. Further, a urethane-modified polyester acrylate, a two-component thermosetting resin, is spin-coated on the entire surface of the substrate so as to have a cured film thickness of 1 μm, and is cured by heat treatment at 230 ° C. for 1 hour. A layer was formed.
When the color filter for liquid crystal produced without performing light irradiation or heat treatment as described above was observed with an optical microscope, no color mixture was observed as in the case of Examples 1 to 3.

A color liquid crystal panel was manufactured by using the color filters obtained in Examples 1 to 5 in combination with a TFT-side substrate as shown in FIG. When an image was displayed using the obtained color liquid crystal panel, a good color image could be displayed.

[0051]

As described above, according to the present invention, the black matrix and the colored pixel portion can be formed by a simple method, and the obtained color filter has the required characteristics as a color filter. It is a color filter for liquid crystal display which is excellent, particularly excellent in color characteristics without color mixing. Further, according to the present invention, a reduction in manufacturing cost is achieved and an inexpensive color filter is provided, so that a color liquid crystal panel at a reasonable price can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram schematically illustrating an example of a method for manufacturing a color filter of the present invention.

FIG. 2 is a schematic sectional view of an example of a color liquid crystal panel incorporating the color filter of the present invention.

[Explanation of symbols]

 1: transparent substrate (glass substrate for color filter) 1 ′: transparent substrate (glass substrate for TFT) 2: ink-absorbing resin layer 3: inkjet head 4: photomask 5: colored pixel section 6: black ink 7: light shielding Part 8: protective layer 9: common electrode 10, 10 ': alignment film 11, 11': polarizing film 12: pixel electrode 13: liquid crystal compound A: color filter side substrate B: TFT side substrate

Claims (6)

[Claims] 1. A process of forming colored pixel portions of three primary colors of red, green and blue on the surface of a light-transmitting substrate, and thereafter immersing the substrate on which the colored pixel portions are formed in black ink. Forming a light-shielding portion by using the method. 2. The step of forming a colored pixel portion comprises, after forming an ink-absorbing resin layer on a transparent substrate in advance, using a photo-curing resin containing at least a photo-curable resin composition thereon by an ink jet recording apparatus. The colored pixels are arrayed by ejecting the non-reactive ink, and thereafter, the photo-curable ink is cured by exposing the entire substrate or a predetermined pattern to form a colored pixel portion, and a light-shielding portion is formed. Step, after forming a black portion in a region other than the colored pixel portion by immersing the substrate in a photocurable black ink liquid containing at least the photocurable resin composition, the black portion by exposing 2. The method for producing a color filter for a liquid crystal display according to claim 1, comprising curing to form a light shielding portion. 3. The ink-absorbing resin layer in the step of forming a colored pixel portion, wherein the ink-absorbing resin layer is formed of at least one low-molecular-weight material among components of a photocurable resin composition for forming a photocurable ink, or The colored pixel portion is formed by previously applying an ink-absorbing resin containing at least one of the above components on a transparent substrate, and the colored pixel portion contains at least the remaining material of the components of the photocurable resin composition and a coloring agent. A step of applying ink by an ink jet recording apparatus and forming all the components of a photocurable resin composition for forming a photocurable ink on a transparent substrate, and further forming a light shielding portion The photo-curable black ink in the above has a material similar to the constituent material of the photo-curable resin composition contained in the ink ejected by the ink jet recording apparatus. 3. The method for producing a color filter for a liquid crystal display according to claim 2. 4. The step of forming a colored pixel portion comprises applying at least one of two or more resin raw materials which react and crosslink by mixing, or a material containing one of them, on a transparent substrate in advance. After that, an ink containing at least another kind of resin material and a colorant is ejected onto the transparent substrate by an ink jet recording apparatus and applied onto a transparent substrate, and all the resin materials are mixed on the substrate. Reaction of raw materials
By forming a colored pixel portion by crosslinking, and
The step of forming the light-shielding portion is performed by immersing the substrate in a black ink liquid containing a resin material similar to the resin material contained in the ink to be ejected by the inkjet recording apparatus, and excluding the colored pixel portion. 2. The method for producing a color filter for a liquid crystal display according to claim 1, wherein after forming a black portion in the region, the black portion is cured by exposing to form a light shielding portion. 5. A color filter for a liquid crystal display, produced by the method according to claim 1. Description: 6. A liquid crystal panel, wherein a liquid crystal compound is sealed between a substrate provided with the color filter for liquid crystal display according to claim 5 and a counter substrate facing the substrate. .