JPH04143729A - Color liquid crystal display device - Google Patents

Abstract

PURPOSE:To obtain a color filter with high flatness by forming a transparent organic high polymer layer of a thin film on a flat color filter in specific pattern, removing a flattening film from a seal part and a mount terminal part, and also laminating an inorganic thin film. CONSTITUTION:On a transparent glass substrate 1, color filters 2a - 2c are formed by a back exposure system for one of many colors and the transparent organic high polymer layer 3 is selectively patterned and formed on the color filter surfaces by a flexographic printing method; and the inorganic thin film 5 and a transparent electrode 6 are laminated in this order and an orienting film 9 is formed. Thus, the organic high polymer film 3 is patterned selectively and thinnly on the surfaces of the color filters 2a - 2c. Consequently, the color liquid crystal display device which has the highly flat color filters and superior mount reliability, optical characteristics, and chemical resistance is obtained.

Description

[Detailed description of the invention] [Industrial application field 1 The present invention relates to a color liquid crystal display device.

[Prior Art] As color liquid crystal televisions and color liquid crystal displays for office automation have become larger, high-quality color liquid crystal display devices have been developed.

Traditionally, dyeing methods have been used to form color filters.
Electrodeposition, printing, and dispersion methods are used. In order to flatten the color filter surface, a transparent organic polymer layer is formed on the color filter surface, and this transparent organic polymer layer is polished or transparent. By forming a thick organic polymer film,
A technique is used to flatten the surface of the color filter.

Hereinafter, an example of a color filter surface planarized by a conventional planarization method will be described.

FIG. 2 is a cross-sectional view that has been planarized by conventional planarization processing. In FIGS. 2(A) and (B), color filters 2a, 2b, and 2c are formed on a glass substrate 1, and a transparent organic polymer 3 is formed to cover the surface of the color filter. A flattening layer is provided to alleviate the unevenness of the portion.

The transparent organic polymer layer 3, which is a flattening layer, is formed by coating using a spin coater method, a roll coke method, or the like. On this transparent organic polymer layer 3, an inorganic thin film 5,
A color liquid crystal display device can be obtained by bonding the glass substrate 1 on which the transparent electrode 6 and alignment film 9 are formed and the opposing glass substrate 7 and injecting liquid crystal.

[Problems to be Solved by the Invention] However, in the flattening method using flattening treatment as described above, a transparent organic polymer layer is formed so as to cover the unevenness of a part of the color filter, so it is difficult to achieve good flatness. is difficult to obtain. Therefore, in order to obtain good flatness, it is necessary to laminate transparent organic polymer layers to increase the film thickness. Alternatively, if a thick transparent organic polymer layer is formed and then flattened using polishing, damage such as fine scratches will remain on the surface of the transparent organic polymer layer. need to be formed.

When performing planarization treatment using such a method, there are problems in that the number of manufacturing steps increases and the optical characteristics deteriorate due to the thickening of the transparent organic polymer layer.

In addition, when the film thickness of the inorganic thin film is 200A or less, the inorganic thin film is formed in an island shape, so the adhesion between the transparent polymer layer and the transparent electrode layer and the chemical resistance of the transparent organic polymer layer are improved. However, the problem was that the passivation effect could not be achieved. In addition, when forming an inorganic thin film with a thickness of 5000 Å or more, the film formation cost is high and it is difficult to reduce the cost.6 In view of the above problems, the present invention has been developed to provide a simple manufacturing method. The present invention provides a liquid crystal display device having a highly flat color filter.

[Means for Solving the Problems 1] The present invention includes a pair of transparent substrates facing each other with a liquid crystal layer interposed therebetween;
In a color liquid crystal display device equipped with a plurality of color filters arranged in a predetermined multi-color pattern on the liquid crystal side of one transparent substrate, the color filter is a pigment-dispersed color filter using a color resist, and is a multi-color filter. A transparent organic polymer film, an inorganic thin film, and a transparent electrode film are laminated in this order so as to cover a flat color filter in which one color is formed using a back exposure method. This is a color liquid crystal display device having a highly flat color filter on which no organic polymer film is formed.

[Function] According to the above-described manufacturing method, the present invention has a highly flat color filter by selectively patterning a transparent organic polymer film in a thin film using a flexographic printing method on the flattened color filter surface, and has a high level of mounting reliability. A color liquid crystal display device with good application properties, optical properties, and chemical resistance can be realized.

[Example] Hereinafter, a color liquid crystal display device according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a color liquid crystal display device according to an embodiment of the present invention.

In Figure 1, color filters 28.2b and 2c are formed on a transparent glass substrate l by back exposure of one of many colors, and a transparent organic polymer layer 3 is formed on the surface of the color filter by flexographic printing. Selected pattern is formed,
Furthermore, it is a sectional view of a color liquid crystal display device in which an inorganic thin film 5 and a transparent electrode 6 are laminated in this order, and an alignment film 9 is formed.

In the embodiment, color filter layers 2a, 2b, and 2c having a thickness of about 2 μm are formed by a spin coater method using a dispersion type color resist.

The color filter shape is R with a 110μm wide stripe.
, G, and B, and one of these colors serves both as a pixel display and as a black stripe section.

Color resists are applied for the first and second colors using a spin coater, and after baking, exposure using a predetermined photomask, development, and post-bake treatment are performed to form a stripe pattern of color filters of each color.

After applying a color resist for the third color using a spin coater and baking, the previously formed two-color stripe pattern is used as a light-shielding mask to form a resist through back exposure, development, and post-baking.

By this back exposure method, flat color filters 28.2b and 2c without overlapping color filter layers can be formed.

On the surfaces of the completed three-color color filters 2a, 2b, and 20, a transparent organic polymer film 3 is selectively patterned by flexographic printing and fired.

At this time, the transparent organic polymer film is formed as a thin film on the order of lum, and can be filled without being affected by the unevenness of the surface of the color filters 2a, 2b, 2c, so that a highly flat color filter can be formed.

Next, in order to improve the chemical resistance, liquid crystal resistance, and adhesion to the transparent electrode film 6 of the transparent organic polymer film 3, an inorganic thin film 5 of SiO After laminating the electrode films 6 in this order, a good transparent electrode pattern can be formed using a predetermined photomask.

The reason why the thickness of the inorganic thin film 5 of the 5102 film is limited is that when the film thickness is less than 200 Å, the SiO□ film is formed in an island shape, so the close contact between the transparent organic polymer film 3 and the transparent electrode film 6 is reduced. In addition, if the 5102 film thickness is 4000 Å or more, the adhesion between the transparent organic polymer film 3 and the transparent electrode film 6 is good, but the film formation cost increases due to the increase in the film formation time of the inorganic thin film, etc. is undesirable because it increases the

[Effects of the Invention] As described above, the present invention is a color filter that uses a color resist to selectively apply one color out of multiple colors onto a flat color filter formed by a back exposure method. A structure in which a transparent organic polymer layer is formed as a thin film in a predetermined pattern and used as a flattening film to eliminate unevenness in the color filter part, and the flattening film is removed from the seal part and mounting terminal part, and an inorganic thin film is laminated. By making
It is possible to provide a low-cost color liquid crystal display device that provides high flatness, chemical resistance, IIT liquid crystal properties, and mounting reliability, and has excellent optical characteristics due to uniform cap control.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a color liquid crystal display device of the present invention;
FIGS. 2A and 2B are schematic cross-sectional views of a conventional color liquid crystal display device. 1.7...Transparent glass substrates 2a, 2b, 2
c...Color filter layer 3...Transparent organic polymer film 5...Inorganic thin film 6.8...Transparent electrode film・More than alignment film sealant

Claims (3)

[Claims] (1) In a color liquid crystal display device comprising a pair of transparent substrates facing each other with a liquid crystal layer interposed therebetween, and a plurality of color filters arranged in a predetermined multi-color pattern on the liquid crystal side of one of the transparent substrates, the color The filter is a pigment-dispersed color filter using a color resist, and consists of a transparent organic polymer film, an inorganic thin film, and a transparent electrode film covering a flat color filter in which one of the many colors is formed using a back exposure method. A color liquid crystal display device characterized in that the transparent organic polymer film is removed from the seal portion and the mounting terminal portion. (2) Form a transparent organic polymer film using flexographic printing method,
Claim 1 characterized in that the film thickness is about 1 μm.
The color liquid crystal display device described. (3) The color liquid crystal display device according to claim 1, wherein the inorganic thin film is made of silicon oxide, silicon nitride, or alumina oxide, and has a thickness of about 200 Å to 4000 Å.