JPH0943419A - Production of color filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To relieve irregularity in colors or decrease in flatness which deteriorate the display quality of a color liquid crystal display device by laminating a color photosensitive resin film of a second or succeeding colors in the parallel direction to the stripe pixels preliminarily formed. SOLUTION: A color filter is produced by successively forming a light- shielding layer and color pixels of three colors on a transparent substrate. In this method, a color photosensitive resin film of the second or succeeding colors is laminated in the parallel direction to the stripe pixels which are already formed on the transparent substrate. Namely, when the film of the second or succeeding colors is to be laminated, the film is laminated in the parallel direction to the stripe pixels already formed on the substrate glass so as to reduce the width of recesses and projections of the pixels. If the film is laminated in the perpendicular direction, the roll moves over the pixels already formed and this reduces uniform distribution of the film thickness in the pixel. By laminating parallel to the pixel direction already formed, flow of the film from the adjacent pixels is made uniform and the pressure is made uniform to reduce steps in the pixel.

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]

The present invention relates to a method of manufacturing a color filter in which a light shielding layer and three colored pixels are sequentially formed on a transparent substrate, and a colored photosensitive resin film for the second and subsequent colors is already formed on the transparent substrate. This is a method of manufacturing a color filter, which comprises laminating parallel to the stripe-shaped pixels formed above.

[0009]

That is, according to the present invention, when laminating the second and subsequent colors, the film is already laminated on the substrate glass in the direction parallel to the stripe-shaped pixels so that the concavities and convexities of the pixels are targeted as the right tilted shape to reduce the width of the concavities and convexities. It alleviates. When laminating the film in the second and subsequent colors, when laminating in the direction perpendicular to the stripe-shaped pixels, the roll will be over the existing pixels, and the existing pixels will be located near the pixels in front of the roll advancing direction. The film is thickened because it flows and flows onto the glass, but conversely, in the vicinity of the pixel in the back of the roll advancing direction, there is no flow from the existing pixel and the film is crushed by the roll pressure, so the film thickness It becomes a thin J-shape. This shape causes a reduction in the film thickness distribution in the pixel. In the present invention,
The laminator direction is horizontal to the existing pixel direction, the film flow from the adjacent pixels is made uniform, and the pressure is made uniform so as to prevent crushing and reduce the step in the pixel.

[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. As a result, it was possible to reduce to 0.5 μm or less as compared with 0.9 to 1.1 μm in the case of laminating the step difference in the pixels of the second color and the third color in the direction perpendicular to the pattern.

[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. A method for manufacturing a color filter in which a light-shielding layer and three colored pixels are sequentially formed on a transparent substrate, and a colored photosensitive resin film for the second and subsequent colors is already formed on the transparent substrate in a stripe shape. A method of manufacturing a color filter, which comprises laminating in a direction parallel to a pixel.