JPS61233704A - Manufacture of color filter - Google Patents

Abstract

PURPOSE:To obtain a color filter which has a finer colored image pattern by transferring images of red, blue and green which are formed by exposing and developing photoresist and can be transferred to a transparent base. CONSTITUTION:The photosensitive resin sheet consisting of a temporary base 1, an undercoat layer 2, a photosensitive resin layer 3 and a protective layer 4 is superposed on a matrix type exposure mask, and exposure and development are carried out to obtain sheets which have matrix type images of red, blue, and green on different temporary bases. The temporary base having the image of red is superposed and then laminated on image receiving sheets 6, 7 and 8 so that the image side contacts image receiving layers of the image receiving sheets, and only the temporary base of the image sheet is peeled off the undercoat layer 2, thereby transferring the image of red to the image receiving sheet. Then, images of blue and green are transferred similarly and a polarizing film 11 is superposed and laminated, and the polarizing film is peeled off the image receiving sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a color filter. Recently, liquid crystal, plasma EL (electroluminescence),
LEDs (light emitting diodes), fluorescent display tubes, etc. were used. e
Research on flannel is underway. Among these, liquid crystal displays are being actively researched because they can be driven with low voltage and low power.

In order to display color on a liquid crystal display, a cell is created in which a transparent substrate with transparent electrodes arranged in a matrix and a transparent substrate with transparent electrodes placed on the entire surface (= transparent substrate with transparent electrodes placed on the entire surface) are pasted together via a sweeper with the transparent electrodes on the inside. A liquid crystal sealed inside is sandwiched between two polarizing plates, and a color filter is superimposed on this.

A color filter is one in which red, blue, and green images are provided in a matrix on a transparent support.

The color filter may be used by being sandwiched between a transparent substrate provided with transparent electrodes and a polarizing plate. In addition, a transparent substrate with two transparent electrodes on the entire surface is used as a transparent substrate for a color filter, and a matrix with red, blue, and green images provided on the surface of the transparent electrode or the opposite surface of the substrate can also be used as a color filter. It will be done.

[Conventional technology]

Conventional manufacturing methods for color filters include printing images of each color in a matrix on a transparent substrate with transparent electrodes arranged in a matrix. A photoresist is applied on top of the photoresist, imagewise exposed in a matrix, and developed to form a resist mask in a matrix, and then the colored layer in the areas not covered by the resist mask is selectively removed by etching. There is a method in which the process is carried out for three colors, red, green and green.

However, with method (1), an image with clear boundaries cannot be obtained due to bleeding of printing ink, and therefore,
There were disadvantages in that color images with finer patterns could not be obtained, and it was difficult to accurately align the three-color image patterns during printing, resulting in images partially overlapping.

The method (11) has the drawbacks of requiring many complicated manufacturing steps, resulting in high costs, and difficulty in accurately aligning the images of each color. In addition, when forming colored layers of different hues on the pattern of the colored image, it is necessary to use a resist dyeing method that prevents the pattern of the colored image from being dyed, which has the disadvantage of further complicating the process. There is.

[Problems to be solved by the present invention]

The objects of the present invention are to provide a method for producing a color filter having a finer colored image pattern, to provide a method for producing a color filter having a clear colored image pattern without image boundaries (bleeding), To provide a method for manufacturing a color filter that makes it easy to align image patterns of each color, to provide a method for producing a color filter that allows the color filter to be obtained at low cost through a simpler production process. It is in.

[Means for solving problems]

The object of the invention is achieved by transferring transferable red, blue and green images created by exposing and developing a photoresist to a transparent support.

These three color images were created on different temporary supports (:
These may be prepared in advance and transferred to the final transparent support by performing three transfer operations.

In addition, three-color images created on different temporary supports were once transferred onto seven temporary image-receiving sheets by three transfer operations to create sheets carrying three-color images, and these three The color image may be transferred to the final transparent support in seven transfer operations.

This way, you can check the alignment during the process, so
Advantageously, there is less loss of final transparent support due to misalignment.

A method of creating a colored image by exposing and developing a photoresist and transferring this to a final support is disclosed in JP-A-Sho! 27/4tO.

Tokukaisho also applies to this invention! Materials described in Tartuff/4tO can be used.

There are no particular restrictions on the type of transparent support that is the substrate, but it is necessary that it does not undergo significant deformation, shrinkage, or elongation under heating and/or pressure. Examples of such supports include polyethylene terephthalate film, cellulose triacetate film, polystyrene film, polycarbonate film, and polymer laminated paper. Among these, transparent supports are preferable because alignment using transmitted light is easy. Biaxially oriented polyethylene terephthalate film is particularly preferred in terms of dimensional stability and transparency.

As the substantially transparent support to which the image is finally transferred, a polarizing film may be used, or a transparent substrate provided with a transparent electrode may be used.

Polymer as a polarizing film! ! , // issue pr3゜~rj4
t (/?l'4t) and JP-A-Shoj3-1014t! r
The one described in is used. Examples of products on sale include "Parilite" manufactured by Royal Electric.

The transparent electrode is made of polymer 33. Those described in p♂33 to r34 of // issue and θ of JP-A-40-371 are used.

A specific example is S”02+InzOa *IT
A transparent conductive film such as O (Indium Tin Oxide) or a metal thin film such as Au*AJ HPd is used.

An undercoat layer may be applied to the surface of the temporary support for the purpose of facilitating peeling off of the colored image and transfer to an image-receiving sheet. The undercoat layer may be an organic polymer such as a polyamide, and more specifically, an N-cocondensate of caprolactam-adipic acid-hexamethylene diamine-lauryllactam.
Examples include methoxymethylated products. Other examples include polyvinyl alcohol, polystyrene, polyvinyl acetate, polyacrylate, copolymer of polymethyl methacrylate and heptaacrylate, copolymer of methyl methacrylate and vinyl acetate, polyvinyl chloride, polyvinyl chloride and acetic acid. Examples include vinyl copolymers, polyvinyl butyral, and the like.

A single layer of organic polymer may be provided as an image-receiving layer on the surface of the temporary image-receiving sheet for the purpose of facilitating transfer or re-transfer. As the material and structure of this organic polymer layer, Tokko Sho 4t4-/j326, Tokko Sho Meta-4t4t/
, Japanese Patent Publication Showa Guku 4t1130゜ Japanese Patent Publication Showa 4t/-9337
, Unexamined Japanese Patent Application Shoj/-j10/.

Tokukai Akira! Those described in Tartuff/4tO etc. can be used.

As the organic polymer, an organic polymer substance having a softening point of about tθ0C or less according to the yicat method (specifically, a polymer softening point measurement method according to the American Testing Method for Materials AS TMD/JZR) is preferable, and more preferably, to
It is preferably 0c or less, more preferably ro0c or less.

Specific examples of those having a softening point of about rθ0C or lower include polyolefins such as polyethylene and polypropylene. Ethylene copolymers such as ethylene and vinyl acetate, and ethylene and acrylic ester. PVC. Vinyl chloride copolymers such as vinyl chloride and vinyl acetate. Polyvinylidene chloride. Vinylidene chloride copolymer. polystyrene. Styrene copolymers such as styrene and (meth)acrylic acid esters. Holihinyltoluene. Copolymerization of vinyltoluene and vinyltoluene such as (meth)acrylic acid ester. Poly(
meth)acrylic acid ester.

A copolymer of butyl (meth)acrylate and (meth)acrylic ester such as vinyl acetate. At least seven materials are preferably selected from polyamide resins such as vinyl acetate copolymer nylon, copolymer nylon, N-alkoxymethylated nylon, synthetic rubber, and organic polymer materials such as chlorinated rubber.

It is also possible to lower the substantial softening point by adding various plasticizers that are compatible with these organic polymeric substances. Furthermore, by adding a plasticizer that is compatible with organic polymer substances having a softening point of 2066 or higher, the softening point can be substantially reduced to rθ. It is possible to lower it to below C.

To create a colored image on a temporary support by exposing and developing a photoresist, JP-A-Sho! A photosensitive resin sheet described in Tartuff/4tO is used.

A photosensitive resin sheet is a layer containing a photosensitive resin and a coloring material provided on a temporary support.

The coloring material is used by being mixed into the photosensitive resin, but it may also be provided on the temporary support in the form of a laminated layer of a photosensitive resin layer and a layer containing the coloring material.

As the red, back color, and green coloring materials, various materials are appropriately selected and used. For example, Dye Handbook (published by Maruzen Co., Ltd./TakuO), Color Materials Engineering Handbook (Asakura Shoten/published in 1997), Latest Pigments Handbook (edited by Japan Pigment Technology Association/published in 1997), Tokkai Sho! ? -733-03, etc., are selected in consideration of stability with respect to liquid crystals, color reproducibility, desired hue, heat resistance, etc.

The photosensitive resin layer usually has a pressure of 7! at normal pressure. photopolymerization activated by an organic polymer binder, an organic polymer binder, and an actinic ray; It consists of an initiator, and if necessary, a thermal polymerization inhibitor is added.

The vinyl monomer or vinylidene compound that can be used to form the photosensitive resin layer is preferably, for example, an unsaturated ester of a polyol, particularly an ester of acrylic acid or methacrylic acid. Specific examples include ethylene glycol diacrylate, glycerin triacrylate, polyacrylate, ethylene glycol dimethacrylate, /, J--
10/q diol dimethacrylate, polyethylene glycol dimethacrylate), /, 2. Q-butane trio-rotrimethacrylate, trimethylolethane triacrylate, pentaerythritol dimethacrylate,
Pentaerythritol trimethacrylate, pentaerythritol tetramethacrylate, intererythritol diacrylate, hantaerythritol triacrylate, hantaerythritol tetraacrylate, dipentaerythritol-polyacrylate, /13-propanediol-diacrylate, / ,! -pentanediol dimethacrylate), bisacrylates of polyethylene glycol with a molecular weight in the range 200-4 tOθ, bismethacrylates and similar compounds.

As the monomer compound, unsaturated amides can also be used, examples of which include unsaturated amides of acrylic acid and methacrylic acid with α,ω-diamines and ethylene bismethacrylamide. The alkylene chain of an unsaturated amide may therefore be open to 1 carbon atom. However, the photopolymerizable polymer is not limited to these compounds.

Examples of photopolymerization initiators include benzophenone, Michler's ketone [4t,4t'-bis(dimethylamine)]
benzophenone), “l”I-bis(dimethylamino)
Aromatic ketones such as benzophenone, Q-meth)"?cy'-dimethylaminobenzophenone, coethyl anthraquinone, phenanthraquinone, and other aromatic ketones: benzoin, benzoin methyl ether,
Benzoin ethers such as benzoin ether ether and hypenzoin phenyl ether; methylbenzoin, ethylbenzoin and other benzoins; 5-(O-chlorophenyl)-a in narahi.

! -diphenylimidazole dimer 1.2-(0-chlorophenyl) @, j (m-methoxyphenyl)imidazole dimer, 2-(o-fluorophenyl)-4
t, Z-diphenylimitasol dimer, 2-(0-methoxyphenyl)-4t, -diphenylimidazole dimer, -1(p-methoxyphenyl)-4t, t-diphenylimidazole dimer , 2 + 4t-shi (1)
-methoxyphenyl)-j-phenylimidazole dimer, co(λ.

Goodimethoxyphenyl)-a,r-diphenylimidazole dimer, -1(p-methylmercaptophenyl)
-y, t-diphenylimitasol dimer, and U.S. Pat. No. 3,4t7di,/l! British Patent No. 1,0417
．． J-49 and U.S. Pat.
Mention may be made of lyacrylimidazole dimers.

As the organic polymer binder, vinyl polymer substances are particularly preferred from the viewpoint of compatibility with the above-mentioned monomer compounds and photopolymerization initiators. Examples of vinyl polymer substances include polyvinyl chloride, polyacrylic acid, polymethyl acrylate, polyethyl acrylate, polybutyl acrylate,
Various examples include, but are not limited to, polymethacrylic acid, polyethyl acrylate, polyvinyl ether, polyvinyl acetal, and copolymers thereof.

Here, the proper mixing ratio of the monomer compound and the organic polymer binder varies depending on the combination of the monomer compound and the organic polymer binder used, but in general, /:/
The range of θ to Koni/(weight ratio) is preferable. Further, at this time, the amount of the photopolymerization initiator added is preferably in the range of 0.607 to 20% by weight based on the weight of the monomer compound used.

Examples of thermal polymerization inhibitors include p-methoxyphenol, hydroquinone, alkyl- or aryl-substituted hydroquinone, tertiary-butylcatechol, pyrogallol, naphthylamine, β-naphthol, zenathiazine, pyridine, nitrobenzene, 0-torquinone, and aryl phosphite. However, it is not limited to these.

The thickness of the photosensitive resin layer is generally in the range of 20, oi to 10 μm, preferably in the range of 0.0 J to 6 μm.

For details on the materials of these light -sensitive resin layers and the method for forming them, for example, the Special Prince 4TJ -11326, the Special Prince Akita! ! ;-3! /s♂ko issue, Tokukai Sho Tough-411fu No. 30, Tokukai Sho 4t? No.-93337, JP-A-Sho Geter-1
Q issue, JP-A-7/-J10/, JP-A-Sho! Tartafu/'
It is described in various publications such as No. 70.

Furthermore, a protective layer can be provided. The protective layer can be formed, for example, by applying a solution of a polymeric substance such as polyvinyl alcohol, polyvinyl acetate, methyl vinyl ether/maleic anhydride copolymer, polyvinylpyrrolidone, gelatin, gum arabic, and drying.

A pack layer containing acetyl cellulose, a matting agent, etc. can also be provided on the back side of the photosensitive resin sheet for the purpose of blocking resistance, prevention of halation, etc.

The present invention will be explained below with reference to Examples.

〔Example/〕

Create a transferable image according to the following steps.

First, a solution having the following composition was prepared as a coating solution for forming an undercoat layer.

This coating solution was uniformly applied and dried on a polyethylene terephthalate film (thickness: 1100 μm) serving as a temporary support to form an undercoat layer having a dry film thickness of 0.7 μm.

Next, red (R),
The three color photosensitive solutions of blue (B) and green (G) are placed in the cylinders below (see table below).
: The photosensitive solutions of these three colors were applied and dried on three temporary supports each having a subbing layer, so that the composition shown below was obtained. Layers were provided.

Separately, a coating solution for forming a retention layer with the following composition was prepared, and this coating solution was applied to each color of photosensitive resin layer and dried.
A protective layer with a dry thickness of 0.3 μm was provided.

In this way, three kinds of photosensitive resin sheets (negative-tone coloring photosensitive sheets) as shown in FIG. 1 were produced, each consisting of a temporary support, an undercoat layer, a photosensitive resin layer, and a protective layer in this order.

The photosensitive resin sheets of each of the three colors were overlapped with a matrix-like exposure mask and heated using a 1.2 KW ultra-high pressure mercury lamp.
Image exposure was performed from a distance of cm. The exposed photosensitive resin sheet was subjected to 3z using a developer having the following composition. The red, blue, and green matrix-like images were developed on different temporary supports by developing at a temperature of c/0-J for 0 seconds.
: A sheet as shown in Figure 1 was obtained.

developer On the other hand, an image-receiving sheet material was manufactured as follows.

Polyethylene terephthalate film (thickness: iooμ
m) was prepared, and coating solutions A and B having the following compositions were sequentially applied onto the film to produce an image-receiving sheet material having a two-layer structure with a dry film thickness of 20μ and jμ, respectively.

Next, first, a temporary support having a red (R) image is superimposed on the image-receiving sheet so that the image side is in contact with the image-receiving layer of the image-receiving sheet, and then a laminator (first laminator/B-J-!0-♂ Lamination was carried out under the conditions of pressure-pearl, roller temperature/2Q0C laminator speed 0 (7ff1rn, 7 minutes) using a laminator (manufactured by Taisei Shoji ■). Only the temporary support of the image sheet was peeled off from the undercoat layer. On the image receiving sheet (- a red (R) image was transferred. Then,
A temporary support having a blue (B) image is superimposed on this image-receiving sheet, aligned accurately so that the blue image is adjacent to the red image, and fixed using register pins. The green image was transferred in the same way. Next, the green color was transferred in the same manner to obtain a sheet having three-color images on a temporary image-receiving sheet as shown in FIG.

Next, the sheet having the three-color image thus obtained was superimposed on a polarizing film "Varilite" manufactured by Royal Electric Co., Ltd., and then laminated under the same conditions as above.

Next, by peeling off this temporary image receiving sheet and the polarizing film,
, B and G matrix images are the first! A polarizing film with a color filter as shown in Fig. 3 was obtained by transferring the pattern shown in the figure.

Example In Example 1, a photosensitive solution having the composition shown in Table 2 below was prepared, and the dry film thickness θ,! Each was coated so as to give μ, and a positive type photosensitive resin sheet was prepared.

In the same manner as in Example/, this time we used a positive type matrix exposure mask to create red, blue and green images that can be exposed and developed and transferred, and then as in Example/, temporary images were created. Transfer was performed to an image receiving sheet. The sheet having the three-color images thus obtained was laminated with a polarizing film 1Varilite manufactured by Royal Electric Co., Ltd., and then laminated.

By peeling off this temporary image-receiving sheet and polarizing film, the red
A polarizing film with a color filter to which blue and green matrix images were transferred was obtained.

Example 3 A color filter was obtained using a polyethylene terephthalate film having a thickness of about 70 θμ in place of the polarizing film in Example 3.

Example 2 A color filter was produced by using a polycarbonate film provided with a transparent electrode instead of the polarizing film in Example 2 and transferring an image to the opposite side of the electrode.

Example! Coating liquids A and B having the following compositions were coated with a thickness of 20 μm and 62 μm, respectively.
An image receiving layer was formed by sequentially coating the polarizing film to a thickness of m and drying.

Next, the temporary supports carrying the red (R) matrix image obtained in Example 1 were stacked one on top of the other so that the image side was in contact with the image receiving layer of the polarizing film, and then laminated using a laminator. Only the support of the color sheet was peeled off from the release layer, and a red (R) image was transferred onto the polarizing film. A similar operation was later carried out for blue and green to obtain a polarizing film provided with color filters for three-color images in a matrix.

Example B Example! A transparent electrode with a color filter was prepared by using a polyimide film provided with a transparent electrode instead of a polarizing film and transferring an image to the opposite side of the electrode.

In the color filters obtained in Examples/--6, it was possible to form fine patterns, and accurate pattern alignment was possible. Also, these color filters are 77
No change in the spectra was observed even after being left in the air at 0°C for 2 hours.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a photosensitive resin sheet for obtaining a transferable image, and Figure 2 is a cross-sectional view of the photosensitive resin sheet. Figure 3 is a cross-sectional view of a sheet with a transferable image supported on a temporary support; Figure 3 is a cross-sectional view of a temporary image-receiving sheet with one image transferred thereto; Figure D is a cross-sectional view of a color filter. , FIG. 1 shows a matrix colored image pattern, where B indicates blue, R indicates red, and G indicates green. / Temporary support Undercoat layer 3 Photosensitive resin layer Protective layer! Colored image wall turn 6 Temporary image-receiving sheet support 7 Image-receiving layer/layer r Image-receiving layer 2nd layer T Colored image wall turn 70 Colored image pattern // Polarizing film, transparent support, or transparent electrode provided Transparent support patent applicant Fuji Photo Film Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A method for producing a color filter, which comprises transferring red, blue and green images created by exposing and developing a photoresist onto a substantially transparent support. 2. The color according to claim 1, wherein the red, blue and green images created by exposing and developing the photoresist are respectively created on different temporary supports. How to manufacture filters. 3. The red, blue, and green images created by exposing and developing the photoresist are created on one temporary image-receiving sheet, according to claim 1. Method of manufacturing color filters. 4. The method for producing a color filter according to claims 1, 2, and 3, wherein the substantially transparent support is a polarizing film. 5. The method for producing a color filter according to claims 1, 2, and 3, wherein the substantially transparent support is a transparent support provided with a transparent electrode. .