Radiation imagery chemistry: process – composition – or product th – Radiation modifying product or process of making – Screen other than for cathode-ray tube
Patent
1992-02-19
1994-01-11
McCamish, Marion E.
Radiation imagery chemistry: process, composition, or product th
Radiation modifying product or process of making
Screen other than for cathode-ray tube
359 68, 359885, G03F 900
Patent
active
052780090
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a color filter having a colored layer superior in both heat resistance and light resistance and a protective layer that has excellent evenness and high strength. More particularly, the present invention relates to a color filter used in a color liquid crystal display and a method of producing the same.
BACKGROUND ART
A liquid crystal display comprises two transparent substrates, for example, glass substrates, provided with transparent electrodes and disposed with a gap of the order of 1 .mu.m to 10 .mu.m provided therebetween, and a liquid crystal material sealed in the gap, wherein the liquid crystal is orientated in a predetermined direction by application of a voltage between the electrodes, thereby forming transparent and opaque portions, and thus displaying an image. In a color liquid crystal display, a color filter for three colors, i.e., red (R), green (G) and blue (B), corresponding to the three primary colors of light are provided over either of the transparent electrode substrates to effect additive color mixture of the three primary colors by the shutter action of the liquid crystal, thereby displaying a desired color.
Such a color filter for a color liquid crystal display comprises a transparent substrate, a colored layer, a protective film, and a transparent electrically conductive film, which are stacked in the mentioned order. The color filter is disposed to face another transparent substrate, which has electrodes or thin-film transistors formed in opposing relation to the colored pixels of the three primary colors, i.e., R, G and B, with a gap of several .mu.m held therebetween, and a liquid crystal substance is sealed in the gap, thereby forming a liquid crystal display.
FIG. 1 is a sectional view of one example of the color liquid crystal display. The color liquid crystal display 1 includes a color filter 2 and an opposing substrate 3 formed with thin-film transistors (TFT) or transparent electrodes. The color filter 2 and the substrate 3 are disposed to face each other across a predetermined gap and bonded together by using a sealing medium 4 formed by mixing reinforcing fibers with an epoxy resin material or the like. A liquid crystal 5 is sealed in the space defined between the color filter 2 and the TFT substrate 3.
The color filter 2 will be explained below more specifically. A substrate 6, for example, a glass substrate, has a black matrix 7 formed thereon so as to divide adjacent colored pixels by using a metal, e.g., chromium, or a resin material colored with a dye or a pigment, thus forming a colored layer comprising colored pixels of the three primary colors, that is, red colored pixels 8, green colored pixels 9, and blue colored pixels 10, which are divided from each other by the black matrix 7. In addition, a protective film 11 is provided over the colored layer to protect it, and a transparent electrode film 12 for driving the liquid crystal is provided over the protective film 11. Further, an orientation layer 13 for orientating the liquid crystal is formed over the transparent electrode film 12.
Hitherto, colored pixels provided on the color filter are formed as follows. A transparent substrate, for example, a glass substrate, is coated with a transparent resin material obtained by adding a photosensitive material, e.g., a dichromate, a chromate, or a diazocompound, to a hydrophilic resin material, e.g., polyvinyl alcohol, polyvinyl pyrrolidone, gelatin, casein, or glue, thereby forming a transparent photosensitive resin layer. Then, a photomask having an opening pattern with a predetermined configuration is placed over the transparent resin layer, and exposure and development are carried out to form a first resin layer, which is then dyed with a desired dye to form first transparent colored pixels. Next, a transparent hydrophobic resin film for preventing dyeing is formed over the first transparent colored pixels in order to prevent migration of the dye. Thereafter, second transparent colored pixels are formed in the sam
REFERENCES:
patent: 5045418 (1991-09-01), Fukuyoshi
patent: 5051295 (1991-09-01), Mori et al.
Iida Mitsuru
Ishida Takehiko
Tsutsumi Seitaro
Chapman Mark A.
Dai Nippon Printing Co. Ltd.
McCamish Marion E.
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