JPH01206302A - Manufacture of color filter - Google Patents

Abstract

PURPOSE:To simply manufacture the title color filter at low cost by using a photographic system by forming at least one color of blue, green and red by a developer containing at least two kinds of pigments which are varied from diffusivity to non-diffusivity. CONSTITUTION:An emulsion layer 26 corresponding to an opening part 25 of a photomask 24 which has been placed on a silver halide photosensitive material 23 having an emulsion layer 22 is exposed selectively. By a first developer, for instance, a developer containing a cyan pigment and a magenta pigment, the exposed part is developed to blue. Also, even if any developer of a developer for green and a developer for red is used, the development can be executed. In the same way, a formation of a chromatic part after second and third exposures is executed by a pigment developer. These pigment developers become alkali-insoluble and immobile since the pigment developer is oxidized, in a part where silver halide has been exposed. In such a way, a color filter of three colors or four colors can be manufactured at a low cost in a short process.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a color filter, and more particularly to a method for manufacturing a color filter useful for color displays and image pickup tubes.

[Background of the invention]

2. Description of the Related Art Methods for producing color filters using color silver salt photographic materials using internal development methods and external development methods are known.

For example, in JP-A-62-148952, a photographic material having three silver halide layers containing two different couplers among yellow, magenta and cyan couplers was used, and a color filter was formed by an internal development method. The technology to obtain this technique is also disclosed in JP-A-55-6342, in which a photographic material having a black and white silver halide emulsion layer is subjected to pattern exposure, and the process of external color development is repeated to form a pattern of two or more colors on a support. A method is disclosed. Furthermore, JP-A-56-
No. 91203 discloses a method for producing a color filter by an external color development method using a developer containing a dye developer.

The color filters obtained by these photographic methods are: 1) excellent in flatness, 2) inexpensive because the processing process is simple,
■Although it has the advantage of being able to obtain any hue with excellent color purity by selecting a coupler, it has the disadvantage of poor heat resistance (particularly pigments on the long wavelength side are susceptible to deterioration) and lack of sufficient light resistance. I can't say that.

Among the above techniques, the color filter obtained by JP-A No. 56-91203 has considerably improved heat resistance, but the color filter has only one type of dye developer contained in the developer, and the hues of tame, yellow, magenta, and cyan are Easy to form, blue,
In order to obtain green and red hues, one color must be formed, then rehalogenated, and another color must be layered, resulting in high costs due to complicated processes and unstable quality due to difficulty in reproducibility, which is a major problem. It becomes.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for inexpensively manufacturing a color filter with improved heat resistance and excellent color purity through a simple process using a photographic method. It's about doing.

[Structure of the invention]

The above object of the present invention includes a step of forming at least one color of blue, green, and red using a development bath containing at least two types of dyes that change from diffusible to non-diffusible through development processing,
Other colors are formed using external color development method: blue, green, and red.
This was achieved by a method of manufacturing a color filter consisting of four colors: blue, green, red, and black.

Hereinafter, the present invention will be explained in more detail with reference to the drawings.

FIG. 1 shows an example of a photographic material used in the present invention, in which a fine grain black and white silver halide emulsion layer 12 is provided on a support 11.

This support 11 has light transmittance. Furthermore, when assembling LCD color displays, color filters may be exposed to high temperatures during the vapor deposition process.
The material for the support is preferably one having good heat resistance.

Examples of materials constituting such a light-transmitting support include polymeric compounds such as polyethylene terephthalate, polystyrene, polycarbonate, and cellulose acetate;
Glass (for example, borosilicate glass, etc.), inorganic materials such as quartz and sapphire, etc. can be mentioned. The light-transmitting support can be used in the form of a plate, sheet, or film using the above-mentioned materials.

The thickness of the light-transmitting support can be appropriately set depending on the intended use, but it is usually preferably 0.5 μm=10 mm. Especially in the case of LCD color display, 0.3
It is preferable to use a light-transmitting support having a thickness of 2111111 mm.

The support needs to be optically transparent and therefore
In the present invention, not only a transparent support but also a translucent support can be used. Note that a light-transparent backing layer for antihalation may be provided on the surface of the light-transparent support on which the emulsion layer is not provided. Furthermore, the light-transmitting support may be colored within a range that does not impair the properties of the color filter.

The emulsion layer can be directly coated on the light-transmitting support, but the emulsion layer can also be provided via a subbing layer in order to reinforce the adhesive force between the emulsion layer and the support. .

Examples of materials forming the subbing layer include gelatin, albumin, casein, cellulose derivatives, starch derivatives,
Examples include sodium alginate, polyvinyl alcohol, polyvinylpyrrolidone, polyacrylic acid copolymers, and polyacrylamide. The undercoat layer is preferably thin considering the spectral characteristics of the color filter, and is usually 1 μm or less (preferably 0.05 to 0.5 μm or less).
μm).

The emulsion layer is a layer in which silver halide is dispersed in a water-soluble binder, and can be formed by coating a known silver halide. However, in the present invention, in order to obtain a color filter with good spectral characteristics, it is desirable to use silver halide with a small average particle size.
It is preferable to use a so-called Lippmann emulsion having an average grain size of 0.1 μm or less.

As the silver halide, those used in ordinary photographic materials can be used. Namely, silver chloride, silver iodide, silver bromide, silver chloroiodide, silver chlorobromide and silver iodobromide can be mentioned. These can be used alone or in combination, and it is particularly preferable to use silver bromide or silver iodobromide.

As the water-soluble binder in the emulsion layer, conventional binders can be used. For example, gelatin albumin,
Examples include casein, cellulose derivatives, starch derivatives, sodium alginate, polyvinyl alcohol, polyvinylpyrrolidone, polyacrylic acid copolymers, and polyacrylamide. These can be used alone or in combination. Among these water-soluble binders, gelatin is particularly preferred.

The emulsion layer contains the above-mentioned silver halide and a water-soluble binder.
It is desirable that it be contained in a weight ratio of 20 to 8:l.

Note that the emulsion layer may contain additives used in emulsion layers of ordinary light-sensitive materials.

The thickness of the emulsion layer is usually preferably 0.5 to 10 μm. If the thickness is less than 0.5 μm, sufficient color development may not be achieved, and if it is thicker than 10 μm,
The light transmittance may decrease and the brightness of the color filter may become insufficient. In particular, in the present invention, by setting the thickness of the emulsion layer within the range of 0.5 to 3 μm, the spectral characteristics of the resulting color filter can be improved.

The emulsion layer (and subbing layer) is coated using a conventional photographic material coating method.

A back layer for preventing halation may be provided on the back surface of the support 11 of the photographic material thus formed, if necessary.

The color filter of the present invention using the above silver halide photosensitive material and developer is produced as follows.

First, the silver halide photosensitive material described above is exposed in a pattern (first exposure).

Pattern exposure can be performed by a conventional method. For example, as shown in FIG. 2, a silver halide photosensitive material 2 having an emulsion layer 22 laminated on a light-transmitting support 21
By placing a photomask 24 on the photomask 3 and applying light from above the photomask 24, portions 26 of the emulsion layer to be exposed corresponding to the openings 25 provided in the photomask 24 are selectively exposed.

The size of the scheduled exposure portion 26 in the color filter,
That is, the size of the opening 25 of the photomask can be appropriately set according to the intended use of the resulting color filter. However, if the width of the opening 25 is narrower than the wavelength of the structure used for exposure, effective exposure cannot be performed, so the width of the opening 25 is made wider than this wavelength. of\
Since silver halide has effective photosensitivity to light of 340 to 420 nm, the width of the opening 25 is 340 nm.
m or more, and furthermore, considering the use as a color filter, it is preferably 1 μm or more. In addition, in the case of a color filter for a liquid crystal display, the width of the opening 25 must be 1 in order to effectively reproduce colors through additive color mixing of each colored portion developed in red, blue, and green. ,000 μm or less (particularly preferably 500 μm or less).

Regarding other conditions such as exposure time and light source in manufacturing the color filter of the present invention, usual conditions can be followed.

After performing the first pattern exposure in this manner, the exposed portion is first developed using a color filter dye developer. For example, by performing development using a developer (blue developer) containing a magenta dye and a magenta dye as dyes, the exposed portion is developed into a blue color. Also,
By using a developer containing a cyan dye and a yellow dye (green developer), the exposed areas are developed into green.

Further, by using a developer containing a magenta dye and a yellow dye (red developer), the exposed area is developed in red.

The first exposed area may be developed using any of the above-mentioned blue developer, green developer, and red developer.

Development can be carried out according to the development method used in ordinary photographic technology. For example, the development temperature is usually 10 to 40°
C1 development time is usually 30 seconds to 30 minutes.

After developing the first exposed area in this way, the silver halide photosensitive material is usually immersed in a stop solution containing acetic acid, sodium sulfate, etc. to stop the reaction involved in development, and then the silver halide photosensitive material is Rinse the material with water and dry.

In the emulsion layer of the silver halide light-sensitive material thus obtained, the pattern-exposed portion becomes a colored portion colored in a color corresponding to the phenomenon liquid used.

Using a photomask different from that used in the first step above, the unexposed portion adjacent to the first colored portion formed in the first step is exposed in a pattern in the same manner as the first exposure. Then, development is performed using one type of external developer that provides a hue different from that of the dye developer used in the first step. Further, if desired, a second colored portion can be formed by performing steps such as immersion in a stop solution, washing with water, and drying.

Similarly, the unexposed area adjacent to the second colored area is pattern exposed and developed using an external developer that provides a hue other than that used in the first and second steps. A colored part can be formed.

After forming the first to third colored parts in this way, a step of removing the silver component in the photosensitive layer (bleach-fixing step) is usually carried out.
Fix the colored parts.

In this way, a light-transmitting support 31 as shown in FIG.
A color filter having red (R), blue (B), and green (G) light-transmitting colored portions 32 formed thereon can be manufactured.

Further, in the present invention, as shown in FIG. 4, red (R), blue (B) and green (G
) is formed with a gap therebetween, the gap is pattern-exposed, and then developed using an external developer containing a cyan coupler, a magenta coupler, and a yellow coupler. A light-impermeable section (black stripe) 43 can be formed in the gap between the red part (R), the blue part (B), and the green part (G) of the colored part 42.

Various aspects can be considered in the method for manufacturing a color filter of the present invention. That is, first exposure → formation of blue area by dye development process → second exposure → formation of green area by external color development process → third foggy light → formation of red area by external color development process - take bleach-fixing process as an example. For example, changing the colored part formed by dye development to green or red,
The colored portion formed by external color development may be red, blue, blue, or green. In addition, colored areas are formed after the first and second exposures using an external developer (blue→
There are 6 types: green, green → red, red-blue, blue → red, red → green, green-blue), after the third exposure, the colored area is formed using a dye developer, and then the fourth exposure is applied to create yellow. Embodiments in which black stripes are provided by an external color developing solution containing , magenta and cyan couplers are also included in the present invention.

Further, it is also possible to form a colored part after the second exposure using a dye developer, and to form a colored part after the first and third exposures by external color development.

Next, in the present invention, a dye that changes from diffusible to non-diffusible through development processing will be explained.

Examples of the above-mentioned compounds include compounds described in JP-A-51-63618, JP-A-53-69033, JP-B-57-22099, etc.; , Ph.
ot, ), vol. 110, p. 76 (1963), Photographic Journal (Photo, J), vol. 114, p. 338 (1974), U.S. Patent No. 3.173.92
No. 9, No. 3,209.016, No. 3,336.287
No. 3,362,819, No. 3,482.972, No. 3,544.545, No. 3,579.334,
Dye Developer described in No. 3,597.200, No. 3,888.875, etc.
is preferred.

These dye developers have a structure having both a silver halide developer part and a dye part, and are alkali-soluble as they are, and flow out of the photosensitive material in an aqueous alkali solution having a pH above a certain level. Furthermore, in the exposed areas of silver halide, the dye developer is oxidized to become alkali-insoluble and immobilized. Therefore, depending on the exposure pattern of silver halide, unexposed areas lose color due to dye developer flowing out, while dye developer remains in exposed areas to form a color image.

The dye developer preferably used in the present invention is represented by the following general formula CI).

General formula (r)
represents a benzene developer residue, L represents a divalent linking group, and Dye represents a dye residue.

The dye represented by Dye includes various dyes such as azo, anthraquinone, metal chelate, indoaniline, and azomethine, and is freely selected depending on the desired color tone such as yellow, magenta, and cyan. Among them, azo dyes, anthraquinone dyes, and metal chelate dyes are preferred from the viewpoint of fastness.

The linking group represented by is not particularly limited, but preferably does not have a large hydrophobic group that would inhibit the alkali solubility of the dye developer.

Particularly preferred are lower alkylene, aralkylene, arylene, and -Z-NCR)-(L')n-.

Here, Z represents a lower alkylene group containing at least one methylene group (e.g., methylene, ethylene, i-propylene group) or an aralkylene group (e.g., an alkyl group (e.g., methyl, ethyl, butyl group), and L' represents a sulfonyl group. group, carbonyl group, etc., and n represents 0 or l.

As a guideline for lower alkyl groups and alkylene groups, the number of carbon atoms is 1 to 6, which does not interfere with the alkali solubility of the dye developer.
Although those having 6 or more carbon atoms are preferred, there is no problem as long as the alkali solubility can be maintained.

The developer residue represented by X is preferably p-dihydroxyphenyl group, 0-dihydroxyphenyl group, etc.
These may further have a substituent.

Typical examples of dye developers are shown below, but the present invention is not limited thereto.

5O1 15C, 85 υ OH The total amount of the dye developer in the dye developer lI2 used in the present invention is usually preferably 0.5 to 30 g.

If less than 0.5 gJ, the color may not develop sufficiently, while if more than 30 g is used, so-called capri may occur. In particular, in the present invention, developer I
By setting the total amount of the dye developer in Q to 1 to 15 g, a color filter with less color turbidity and good spectral characteristics can be produced.

Further, the blending ratio of dye developers having different hues in the developer can be appropriately set in consideration of the coloring properties of the dye developers used. For example, when combining a cyan dye developer and a magenta dye developer, the weight ratio of both is
Usually l:9-7:3 (preferably 1:9-4
: within the range of 6). In addition, in the combination of a cyan dye developer and a yellow dye developer, l is usually 9 to 7.
:3 (preferably 1:9 to 4:6). Furthermore, the combination of magenta dye developer and yellow dye developer is usually in the range of 9:1 to 8:2 (preferably 8:2 to 6:4).

The dye developer includes an auxiliary developer (for example, tolylhydroquinone, phenidone, metol, etc.) to amplify color development by the dye developer, a pH adjuster (for example, sodium hydroxide, sodium carbonate, sodium phosphate, etc.), Control agents (e.g. potassium bromide, potassium iodide), auxiliary agents (
For example, additives such as water quality conditioners such as polyethylene glycol, color toning agents such as imidazole derivatives, hardening agents such as sodium sulfate, etc.) may be included.

The developer is used after being adjusted to have a pH within the range of 9.0 to 13.0 at a normal use temperature (for example, 20 to 35°C).

Next, the external color developing solution used in the present invention will be explained.

The developer of the present invention contains one type of developing agent and two or more types of couplers.

The developing agent used in the present invention is not particularly limited as long as it can be dispersed or dissolved in the developer.

As the developing agent that can be used in the present invention, C.
E.K. Meese, J.T. James (C
, E., Mees and J., T., James)
Author: The Theory of the Photographic Process, 3rd Edition
PhotographicProcess 3rd,
(1) 4-amino-3-methyl-N-ethyl-N-(2
-hydroxyethyl)aniline sulfate (2) 4-amino-3-methyl-N-ethyl-N-(2
-Medquinethyl) aniline p-toluenesulfonate (3) 4-amino-3-methyl-N-ethyl-N-(2
-methanesulfonamidoethyl) aniline sulfate hydrate (4) 4-amino-N,N-diethylaniline sulfate (5) 4-amino-3-methyl-N,N-diethylaniline sulfate etc. can be mentioned.

In the color filter developer used in the present invention, one type of developing agent is selected and used from among the developing agents listed above.

The selection of a developing agent is usually made in consideration of the type and combination of couplers, etc.

The developing agent in the developing solution is usually developer IQ,
It is contained in the range of 0.1 to 10 g. Content is 0.
If it is less than 1g, it may not be possible to develop effectively, and even if it is more than 10g, not only will there be no significant improvement in developability, but depending on the type of developing agent, it may not dissolve sufficiently. be.

It is preferable to use 0.5 to 7 g per developer iff,
Furthermore, it is particularly preferred to use 1 to 5 g of developing agent.

By setting the blending amount of the developing agent within this range, regardless of the type of coupler used, the development time at normal temperatures can be kept within an appropriate range (for example, within a range of 1 to 10 minutes). This results in very good workability. Furthermore, by keeping it within this range, coloring properties tend to be particularly good.

Among the pullers contained in the external color developing solution, yellow couplers include open-chain ketomethylene compounds (e.g. α-(
4-carboxyphenoxy)-α-pivaloyl-2,4
- Anruacetonitrile such as dichloroacetanilide U.S. Pat. Nos. 3,510,306 and 3,619,139
Those described in Japanese Patent Publication No. 40-33775, Japanese Patent Publication No. 44-3664, etc. can be used.

In addition, as magenta couplers, active methylene compounds (for example, 1-(2,4,6-1-dichlorophenyl)-
3-(4-nitroanilino)-5-1:' lazolone, anruacetonitrile), furthermore, OLS 2,016,587, U.S. Pat. 3,615,502, Japanese Patent Publication No. 44-133111, etc. can be used.

Furthermore, examples of cyan couplers include phenolic compounds (e.g. 2-acetamido-4,6-dichloro-5-methylphenol) or naphthol compounds (e.g. N-
(2-acetamidophenethyl)-1-hydroxy-2
In addition, those described in U.S. Pat. No. 3,00,836, U.S. Pat. No. 3,542,552, U.S. Pat. .

Typical examples of yellow couplers, magenta couplers and cyan couplers that can be used in the present invention are shown below, but the invention is not limited thereto.

(Yellow coupler) (Magenta coupler) (Cyan coupler) I2 In addition to the above couplers, the couplers that can be used in the present invention include rThe Theory of
he Photographic Process
3rd EditionJ (mentioned above), Chapter 17, 38
Those described on pages 2 to 395 can also be used.

Power used in the present invention) - The total amount of couplers in the filter developer 112 is usually preferably 0.5 to 20 g. If it is less than 0.5 g, the color may not develop sufficiently, while if it is more than 20 g, so-called fog may occur. In particular, in the present invention, by setting the total amount of couplers in the developer 112 to 1 to 10 g, a color filter with less color turbidity and good spectral characteristics can be manufactured.

In addition, the compounding ratio of couplers with different hues in the developer is
It can be appropriately set in consideration of the coloring property of the coupler used. For example, when combining a cyan coupler and a magenta coupler, the weight ratio of both is usually 1
:9 to 7:3 (preferably l:9 to 4:6). Further, in the case of a combination of a cyan coupler and a yellow coupler, the ratio is usually within the range of 1:9 to 7:3 (preferably 1:9 to 4:6). Furthermore, in the combination of magenta coupler and yellow coupler,
Usually 9:1 to 8:2 (preferably 8:2
~6:4). When combining the kings of cyan coupler, magenta coupler and yellow coupler, it is preferable to mix approximately the same amount of each of the three couplers.

In addition, the weight ratio of the total amount of couplers to the developing agent in the developer can be set as appropriate by taking into consideration the types and content of the couplers and developing agent.
Usually, the compounding weight ratio of the coupler and the developing agent is adjusted to 1
:9 to 9 : within the range of l (preferably l :5 to 5
: within the range of l).

Furthermore, the developer contains preservatives (e.g., sodium sulfite,
hydroxylamine), alkaline agents (e.g., sodium hydroxide, sodium carbonate), inhibitors (e.g., potassium bromide, potassium iodide), auxiliary agents (e.g., water conditioners such as polyethylene glycol, citrazic acid, imidazole derivatives, etc.) It can contain additives used in ordinary external color developing solutions, such as color toning agents).

〔Effect of the invention〕

According to the present invention, since a dye developer containing at least two kinds of dyes and an external color developer containing at least two kinds of couplers are used, three colors of blue, green, and red or the addition of black can be produced in a shorter process than conventionally. Color filters consisting of four colors can be provided at low cost and with stable quality.

Furthermore, the obtained color filter has very poor heat resistance.

〔Example〕

Hereinafter, the present invention will be specifically explained with reference to Examples.

Example 1 (Preparation of silver halide photographic material) A silver nitrate aqueous solution and an aqueous solution containing potassium bromide and potassium iodide were simultaneously added to a 10% aqueous solution of gelatin, thereby containing 2.5 mol% silver iodide. A silver iodobromide emulsion was made. The addition conditions were regulated so that a Lippmann emulsion having an average grain size of 0.05 μm was obtained. This emulsion was chemically ripened with sodium thiosulfate at 55°C for 1120 minutes.

The above emulsion coating solution was applied to a transparent blue plate glass substrate (30 cm x 30 cm) with a dry film thickness of 1.1++++n.
．． A silver halide photographic light-sensitive material was prepared by coating to a thickness of 5 μm. The amount of rooting was 1.1 g/m''.

(Preparation of color filter) A chromium mask for a color filter having a square opening with a side of 165 μm was placed on top of this photographic material, and a first exposure was performed using a mercury lamp.

Place the exposed photographic material in the following blue dye developer at 23°C.
immersed in water for 2 minutes.

Blue dye developer composition Anhydrous sulfite].Rium 5g Dye developer (Exemplary compound 8) 2 g Dye developer (Exemplary compound 17) 1.5g Sodium hydroxide
0.5g sodium sulfate
30 g tolylhydroquinone
4.5g dimethylformamide
Add 10 mQ water to make the total volume IQ.

Next, the substrate was immersed in a stop solution (containing 32 mα of 28% acetic acid and 20 g of sodium sulfate in 14) for 30 seconds, washed with water for 5 minutes, and dried to form a blue portion on the substrate.

Next, another chrome mask for color filter is placed immediately next to the formed blue part, and a second chrome mask is placed in the same manner as above.
The second exposure was made.

The photosensitive material subjected to this second exposure was developed for 3 minutes at 23°C using the following green external developer, then stopped, washed with water, and dried to form a green color on the substrate in the same manner as the first time. The division was formed.

After adding the coupler methanol solution A to the developing agent aqueous solution B, add water to make 1Q, and adjust the pH with sodium hydroxide.
Adjusted to 11.5.

Furthermore, a third color filter chrome mask was placed on the right side of the formed green area (that is, on the left side of the blue area), and a third exposure was performed in the same manner as above.

The photosensitive material exposed for the third time was developed and stopped in the same manner as the second time, except that the following red external developer was used, and then fixed in a bleaching solution with the composition shown below for 5 minutes. A red portion was formed on the support by immersing it in the solution for 5 minutes at 23°C (desilvering treatment).

Methanol 50mQ Same as the previous recording extrachromatic developer, methanol solution A was added to aqueous solution B, then water was added to make the solution 1 (2) and the pH was adjusted to 11.5.

Bleach solution composition Ammonium bromide 160.0g Ammonia water (28%) 25.0++
+Q ethylenediaminetetraacetic acid iron sodium salt 130.0
g Rice vinegar R14, Om Q Add water to bring the total volume to 1Q.

Fixer composition Sodium tetrapolyphosphate 2.0 g Anhydrous sodium sulfite 4.0 g Ammonium thiosulfate (70% aqueous solution) 175.0 mQ Sodium bisulfite 4.0 g Add water to bring the total amount to 14.

After desilvering, the color filters obtained by washing with water for 10 minutes and drying have a blue part, a green part, and a red part of a square with a side of 165 μm uniformly formed on the entire blue plate glass substrate, and each color In both cases, no color turbidity was observed.

In addition, we measured the spectral transmittance of each color after placing the color filter in the open and keeping it at 180°C for 6 hours.
Almost no change was observed in each color, which was similar to the heat resistance.

[Example 2] In Example 1, after the first exposure, the photosensitive material treated with a blue dye developer to form a blue area was given a second exposure, and then treated with the following green dye developer at 23°C. immersed in water for 2 minutes.

Green dye developer composition Anhydrous sodium sulfite 59 Dye developer (Exemplary compound 17) 1.2g Dye developer (Exemplary compound 6) 1.89 Sodium hydroxide
0.5g sodium sulfate
309 Tolylhydroquinone 4
．． 5g dimethylformamide lOI+I
Add Q water to bring the total volume to 1Q.

After stopping the development, washing with water, and drying in the same manner as in Example 1, a third exposure was applied, and the magenta coupler in the red external developer of Example 1 was converted into 7-chloro-3,6-cymethyl-1).
1-pyrazolo[5,1-c] ]1,2.4-triazole was used in the same external developer except that 1.28 was used.
After developing at 3°C for 3 minutes, the film was bleached, fixed, washed with water and dried in the same manner as in Example 1 to obtain a color filter having three colors of blue, green and red.

The obtained filters had good purity in each color and excellent heat resistance (particularly in blue and green parts).

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a silver halide photographic material used for manufacturing the color filter of the present invention, FIG. 2 is a cross-sectional view showing an example of pattern exposure in the method of carrying out the present invention, and FIGS. 3 and 4. 1 is a sectional view showing an example of a color filter obtained according to the present invention. 11.21, 31.41...light-transmitting support, 12.
22...Silver halide emulsion layer, 13.23...Silver halide photographic material, 24...Photomask, 25...Opening 26...Exposed portion, 32,42.43.・・Colored section

Claims (1)

[Claims] A step of forming at least one color of blue, green, or red using a developing bath containing at least two types of dyes that change from diffusible to non-diffusible through development processing, and forming other colors by an external color development method. A method for producing a color filter consisting of three colors, blue, green, and red, or four colors, blue, green, red, and black, characterized by the following.