JPH02191901A - Color filter - Google Patents

Abstract

PURPOSE:To obtain the color filters having high reliability by providing red, green and blue picture elements consisting of photosetting colorable photoresists and black matrix and providing a layer consisting of a photosetting transparent photoresist of only the photosensitive resin thereon. CONSTITUTION:The red, blue and green picture elements 2, 3, 4 consisting of the photosetting photoresist formed by dispersing pigments into the photosensitive resin and the black matrix film 5 are provided on a transparent substrate 1 consisting of glass, etc. Further, the photosetting transparent photoresist layer 6 consisting of only the photosensitive resin is provided thereon. The picture elements 2, 3, 4 and the black matrix film 5 are coated with this photoresist layer 6, by which the projections by the picture elements 2, 3, 4 and the black matrix film 5 are leveled and absorbed and the surface smoothness is improved. In addition, the above-mentioned photoresist layer is of the same photosensitive resin as the photosensitive resin of the underlying picture element films and, therefore, the characteristics, such as thermal expansion, are uniformed and the color filter which is free from peeling, etc., is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a color filter used in color televisions, color cameras, color display devices, color imaging devices, and the like.

Conventional technology In general, color filters used in color LCD televisions, etc. are made by forming red, green, blue, etc. pixels and a black matrix at a predetermined pitch on a glass substrate by dyeing, printing, etc. It is used. In particular, for high-definition images, color filters created by dyeing methods are mainly used.

Color filters made using the dyeing method are made by patterning and curing the dyeing base material, which is a natural photosensitive resin such as gelatin or a photosensitive synthetic resin such as amine-modified polyvinyl alcohol, using photolithography, and then dyeing this with a dye such as an acid dye. However, there are problems with reliability such as light resistance, heat resistance, and moisture resistance, and there are also problems with manufacturing stability as uneven dyeing tends to occur during dyeing.

For this reason, a color filter has been proposed using a colored photoresist method in which a pigment with excellent light resistance and other reliability is dispersed in a photosensitive resin and patterned by photolithography.

Problems to be Solved by the Invention However, in the above colored photoresist method, the size of the dispersed pigment particles is 0. 1 to 0.5 μm, and the particles are exposed on the surface of the pixel and black matrix films, and when an electrode of a transparent conductive film (for example, ITO) is attached thereon, the surface is not smooth, resulting in poor adhesion. It peeled off, causing defects such as counter-sheets. Further, since the photolithography method is used to perform back-to-back alignment, the pixel film and the black matrix film overlap to form protrusions due to alignment errors, resulting in defects similar to those described above.

In view of the above, an object of the present invention is to provide a color filter that is free from defects and has excellent reliability.

Means for Solving the Problems In order to solve the above problems, the present invention provides red, green, and blue pixels and a black matrix made of a photocurable colored photoresist in which a photosensitive resin and a pigment are dispersed on a transparent substrate. , further comprising a layer made of a photocurable transparent photoresist consisting only of the photosensitive resin, preferably a polyfunctional acrylate monomer as the photosensitive resin.
It is preferable to use a photopolymerization initiator consisting of an organic polymer integrator and a trihalomethyl-8-)riazine compound.

Effect According to the present invention, pixels and black matrix film made of a photocurable colored photoresist can be coated with a photocurable transparent photoresist, so that the protrusions are absorbed by leveling and the surface smoothness is improved. Moreover, since it is made of the same photosensitive resin as the underlying pixel film, it has uniform properties such as thermal expansion, and a highly reliable color filter without peeling etc. can be obtained.

Example FIG. 1 shows a cross-sectional view of the color filter of the present invention.

1 is a transparent substrate (e.g. glass), 2.3.4 is a substrate 1
Red, blue, green, and blue pixels are made of a photocurable photoresist in which a pigment is dispersed in a photosensitive resin formed on the photoresist, 5 is a black matrix, and θ is the photosensitive resin formed on the colored photoresist and the black matrix. This is a photocurable transparent photoresist layer made only of a transparent resin.

Here, one example of the material of the color filter used in the present invention will be shown. Examples of the photosensitive resin include ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, t, e
- A polyfunctional acrylate monomer selected from hexanediol diacrylate, pentaerythritol diacrylate, pentaerythritol triacrylate, etc., and chemical properties such as heat resistance and chemical resistance, and surface hardness;
The basic composition of the photopolymerization initiator is an organic polymer binder for imparting mechanical properties such as volume shrinkage and a trihalomethyl-5-)riazine compound. As the organic polymer binder, monomers are unsaturated organic acid compounds such as acrylic acid and methacrylic acid that are compatible with acrylate monomers, and organic acid esters containing vinyl groups such as methyl acrylate, ethyl methacrylate, and benzyl methacrylate. Examples include copolymers.

Having an acidic group such as a carboxyl group enables water-soluble development, which is more economical and safer than organic solvent development. As photopolymerization initiators for trihalomethyl-3-triazine compounds, 2-phenyl-4,B-bis(trichloromethyl)-s-)riazine, 2-(p-chlorophenyl)-4,tobis(trichloromethyl) -s-)
riazine, 2-(p-lyl)-4,6-bis-(trichloromethyl)-8-triazine, 2-(p-methoxyphenyl)-4,17-bis-(trichloromethyl)-s-triazine, 2-(2ゝ,4t-dichlorophenyl)-4,8-bis-(trichloromethyl)-S-)
Examples include riazine and the like.

As the red pigment, an anthraquinone pigment or a perylene pigment may be used alone, or a mixture thereof, or a mixture thereof with a disazo yellow pigment or an isoindoline yellow pigment may be used. For example, as an anthraquinone pigment, C, 1, pigment.

Examples of perylene pigments include C,1, Pigment Red 155. Among these, from the viewpoint of color reproducibility, a mixture of C,1, Pigment Yellow-83 or C11, Pigment Yellow-139 is preferable. As the green pigment, a halogenated phthalocinine pigment alone or a mixture with a disazo yellow pigment or an isoindoline yellow pigment is used, such as C, 1, Pigment Gerinph, 3El, 37 and C11, Pigment Yellow 8.
3 or C,I, and a mixture with Pigment Yellow-139 is preferable.

As the blue pigment, a phthalocyanine pigment alone or a mixture with a dioxazine purple pigment is used, for example, C, l.
, Pigment Blue 15:3 and C,1, Pigment Violet 23 are preferably mixed. Furthermore, by using a powdered cane-processed pigment in which the above-mentioned pigment is finely dispersed in any one of acrylic resin, maleic acid resin, vinyl chloride vinegar picopolymer, and ethyl cellulose resin, pigment-containing photosensitizers with good dispersibility and dispersion stability can be obtained. Resin is obtained. In particular, processed pigments using acrylic resins and ethyl cellulose resins are optimal in terms of transparency and dispersion stability. Further, the average particle diameter of the pigment particle system is smaller than the wavelength of visible light (400 nm to 7θ Onm), more preferably 1/2, which has better light transmittance.

Next, a method for manufacturing the color filter of the present invention will be explained.

The following materials were used as an example of the materials shown above as a photosensitive resin (transparent photoresist) and a colored photoresist in which a pigment was dispersed in the photosensitive resin.

Black photoresist Product name: Color Mosaic K (CK) (Fuji Hunt Electro Technology) Red photoresist Product name: Color Mosaic R (CR) (Fuji Hunt Electro Technology) Green photoresist Product name: Color Mosaic G (CG) (Manufactured by Fuji Hunt Electro Technology) Blue photoresist Product name: Color Mosaic B (CB) (Manufactured by Fuji Hunt Electro Technology) Transparent photoresist Product name: Color Mosaic T (CT) (Manufactured by Fuji Hunt Electro Technology) First, the transparent Apply black photoresist to the substrate using a spinner under the conditions shown in Table 1, pre-baking at 100°C for 1 minute on a hot plate, then applying polyvinyl alcohol using the same spinner and pre-baking at 100°C for 1 minute. rear,
After exposure through a mask with a predetermined pattern drawn on it using a UV exposure machine at the intensity shown in Table 1 (wavelength 366 nm),
Heated at 100°C for 1 minute on a hot plate, immersed in a 1% by weight sodium carbonate aqueous solution for 1 minute, and developed at 200°C.
A black pattern was formed by heating for 15 minutes.

Red, green, and blue pixels were also formed in the same process as described above under the conditions shown in Table 1.

(Margins below) Table 1: On each pixel formed in this way, a transparent photoresist was applied under the conditions shown in Table 1 in almost the same process as above,
A color filter was created by exposing the entire surface to light without a mask and heating without development to form a flat transparent layer.

Next, the operation of the configuration of this embodiment will be explained.

The red, green, and blue pixels are formed by covering the black matrix to prevent white spots due to alignment errors, and the height of the overlapping protrusion is reduced by the leveling effect of the resist, but is approximately 0°4 μm. In addition, the pigment particle diameter is 0.1 to 0.5 μm, and approximately 0.1 μm is distributed on the pixel surface.
A certain amount of pigment is precipitated. When a transparent photoresist with a thickness of 0.5 μm is applied on top of this, the above protrusions are absorbed with the help of the leveling effect of the transparent photoresist, and even if an ITO film of 0.05 to 0.1 μm is applied on top of this, the surface remains smooth. Therefore, there will be no peeling or disconnection.

The thickness of the transparent photoresist film can be reduced to about 0.1 μm if there is no guarantee of fogging due to alignment errors and only guarantees for pigment particles.

Furthermore, since the transparent photoresist film used for pixel and planarization is made of the same photosensitive resin, there is no deterioration of the interface, and the coefficient of thermal expansion remains stable even when heated later, for example, when assembling a liquid crystal panel. Since they are the same, there is no cracking or peeling from the interface.

Effects of the Invention According to the present invention, there is provided a highly reliable color filter that is extremely easy to manufacture, has a smooth surface, and substantially eliminates the problem caused by the presence of a protrusion in a portion of the overlap between each pixel and the black matrix. can.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a color filter according to an embodiment of the present invention. 1...Transparent substrate, 2.3.4...Pixel, 5...
...Black matrix, 6...Transparent photoresist layer.

Claims (2)

[Claims] (1) Red, green, and blue pixels and a black matrix made of a photocurable colored photoresist in which a photosensitive resin and a pigment are dispersed are provided on a transparent substrate, and furthermore, only the photosensitive resin is photocured on top of this. A color filter characterized by having a layer made of transparent photoresist. (2) The color filter according to claim 1, wherein the photosensitive resin comprises a photopolymerization initiator consisting of a polyfunctional acrylate monomer, an organic polymer binder, and a trihalomethyl-s-triazine compound.