JPH0943421A - Production of color filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color filter in which irregularity of colors or reduction in flatness which deteriorate the display quality of a color liquid crystal display device are relieved. SOLUTION: In the production method of a color filter by successively forming a light-shielding layer and color pixels of three colors on a transparent substrate, the temp. of a laminating roll is controlled in temp. so that the film is fluidized, and the glass substrate is maintained at temp. lower than that by 10-40 deg.C. Thus, flowing of the resist into steps of adjacent pixels is promoted, while the temp. of the film in contact with the glass substrate is decreased so that the hardness of the film is increased. Thus, collapse of the film is prevented.

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 used in a color liquid crystal display device.

[0002]

2. Description of the Related Art Liquid crystal displays (hereinafter abbreviated as LCDs).
Utilizing features such as thinness, small size, and low power consumption, is currently used for display units such as watches, calculators, TVs, and personal computers. In recent years, color LCDs have been developed and OA / AV
It has begun to be used in many applications such as navigation systems and viewfinders, mainly in equipment, and the market is expected to expand rapidly in the future.

As shown in FIG. 1, a color filter for displaying an LCD in color is R (red) G (green) on a substrate 2 such as a glass plate on which a BM (black matrix) 1 having a lattice pattern is formed. ) B (blue) color pixels 3 (about 100 × 100 × 2 μm) are sequentially formed, and a transparent overcoat layer (OC) 4 is formed thereon. 5 is a polarizing plate and 6 is an ITO electrode.

[0004] In the color LCD, the color filter 7 has an LC
D, the display screen can be colored by transmitting backlight light through a color filter. 8 is an alignment film, 9 is a liquid crystal, 10 is a seal material, 11 is a top coat layer, 12 is an ITO electrode, 13 is a substrate such as a glass plate, 14
Is a polarizing plate.

At present, color filters are mainly manufactured using a dyeing method. However, in this method, a step of forming a pixel by applying a transparent photosensitive resin on a glass substrate, drying, exposing, and developing, dyeing with a dye, and then forming a color mixing prevention layer is required to be repeated three times. Therefore, the number of steps is large and the cost is high. Further, since a dye is used as a coloring agent, there is a disadvantage that reliability (weather resistance and heat resistance), which is an important issue of a color filter, is inferior.
Therefore, some color filters using a pigment as a coloring agent have been proposed, among which are an electrodeposition method, a printing method, and a photolithography method (photolithography method).

However, the electrodeposition method requires the formation of an electrode pattern. (1) The degree of freedom of the pattern is small.
(2) The cost is high, and the printing method has problems such as (1) it is difficult to align a large substrate and the resolution is low, so it is difficult to cope with miniaturization, and (2) the flatness of the pattern is poor. The photolithography method is considered to be the mainstream. For photolithography, liquid resists and films are contemplated. In the liquid resist, color pixels are formed by applying a varnish in which a pigment is dispersed in a photosensitive resin on a glass substrate with a spinner, drying, exposing, and developing. On the other hand, the film is a varnish formed into a film like the photosensitive film for printed boards, and after being laminated on a substrate, color pixels are formed by exposure and development.

[0007]

In a method of manufacturing a color filter for a color liquid crystal display device using a film method, when forming pixels for the second and subsequent colors, a colored photosensitive material is formed on the unevenness of pixels already formed. To form a conductive resin layer,
An uneven film thickness such as “J-shaped” or “M-shaped” occurs, which causes “color unevenness” or “low flatness” that deteriorates the display quality of the color liquid crystal display device. ing. The present invention provides a method for manufacturing a color filter that reduces “color unevenness” and “low flatness” that deteriorate the display quality of a color liquid crystal display device.

[0008]

SUMMARY OF THE INVENTION The present invention is a method of manufacturing a color filter in which a light shielding layer and three colored pixels are sequentially formed on a transparent substrate.
In the method for producing a color filter, the temperature of the laminator roll is set to a temperature at which the flume flows and the temperature of the transparent substrate is set to 10 to 40 ° C. lower than that.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In view of the physical properties of the film, the present invention controls the temperature of the laminator roll and the substrate glass to prevent the film from collapsing during the second and subsequent laminae, and is an image generator. Is to be flattened. Generally, the resist film has a thermoplasticity in which the hardness (viscosity) decreases as the temperature rises above a certain temperature. In order to obtain adhesion between the film and glass during lamination, it is necessary to heat above the glass transition point, and in order to fill the step between adjacent pixels with resist without entrainment of air, the hardness must be high enough for the resist to flow. Heating to reduce (viscosity) is required. On the other hand, when the hardness is lowered in this way, the film already formed on the glass between the pixels is crushed by the pressure of the laminar roll and the film thickness becomes thin. In the present invention, the laminator roll temperature is set to a temperature at which the flume flows, and the glass substrate is set to be 10 to 40 ° C. (or higher) lower than that to promote the flow of the resist into the adjacent pixel step, and to make the glass substrate. Since the hardness of the touched portion of the film increases as the temperature decreases, the film is prevented from being crushed.

[0010]

EXAMPLES The present invention will be described below based on examples. Two
35 parts by weight of 2'-bis [4-methacryloxy, polyethoxyphenyl] propane, γ-chloro-β-hydroxypropyl-β'-methacryloyloxyethyl-o-
Phthalate 15 parts by weight, methacrylic acid / ethyl acrylate / ethyl acrylate (18/30/53 weight ratio)
Copolymer resin 50 parts by weight, 1,7 bis (9-acridinyl) heptane 2 parts by weight, hexamethoxymethylmelamine, methyl ethyl ketone, anthraquinone (red), halogenated copper phthalocyanine (green), copper phthalocyanine (blue) The components were made uniform to obtain a photosensitive resin layer coating solution. The solution is coated on a polyethylene terephthalate film having a thickness of 6 μm by a gravure coater (manufactured by Hirano Seiki Co., Ltd.) and a 30 μm polyethylene film is laminated as a protective film to obtain a photosensitive film. The colored photosensitive resin layer had a thickness of 1.5 μm. Next, a chrome film (film thickness 0.
1 μm) attached glass substrate (1.1 mm × 200 mm × 3)
Roll laminator HLM15 on a glass substrate on which a black matrix is formed with (00 mm, made by Geomatec).
00 (manufactured by Hitachi Chemical Techno Plant Co., Ltd.), substrate temperature 90 ° C., roll temperature 110 ° C., roll pressure 6 kg / c
A photosensitive film is laminated so that the colored photosensitive resin faces the substrate at m2 and a speed of 0.5 m / min, and a parallel light exposure machine MAP1200L is passed through a predetermined negative mask.
(Manufactured by Dainippon Screen Co., Ltd.) using 100 mJ / cm2
After exposure, the polyethylene terephthalate film was removed, and 0.2 wt% Na2B2 was added at 25 ° C. using a spray type developing device DVW911 (manufactured by Dainippon Screen).
An unexposed portion is removed by spray development with an O5 aqueous solution for 20 seconds, and heated at 150 ° C. in a clean oven CSO-402 (manufactured by Kusumoto Kasei) to be cured to form a colored pattern of one color. In this coloring pattern forming step, the laminating direction of the second color and the third color is repeated in parallel with the existing pattern to form a pattern of three colors. The film thickness on the glass after the second color was 1.4 μm or more, and almost no decrease in film thickness was observed.

[0011]

The color filter obtained according to the present invention reduces "color unevenness" and "low flatness" which deteriorate the display quality of a color liquid crystal display device.

[Brief description of drawings]

FIG. 1 is a sectional view of a liquid crystal display.

[Explanation of symbols]

 1. 1. BM (black matrix) Glass substrate 3. Color pixels 4. 4. Overcoat layer (OC) Polarizing plate 6. ITO electrode 7. Color filter 8. Alignment film 9. Liquid crystal 10. Seal material 11. Top coat layer 12. ITO electrode 13. Glass substrate 14. Polarizer

Claims (1)

[Claims] 1. In a method of manufacturing a color filter in which a light-shielding layer and three colored pixels are sequentially formed on a transparent substrate, the lamine roll temperature for laminating a colored photosensitive resin film is such that flume flows. Temperature, transparent substrate 1
A method for manufacturing a color filter, which is set at 0 to 40 ° C. lower.