Stock material or miscellaneous articles – Liquid crystal optical display having layer of specified... – With charge transferring layer of specified composition
Patent
1994-06-10
1995-12-26
Ahmad, Nasser
Stock material or miscellaneous articles
Liquid crystal optical display having layer of specified...
With charge transferring layer of specified composition
359 59, 359 66, 359 68, 428426, 428432, C23C 1808, G02F 113
Patent
active
054786118
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a glass substrate for liquid crystals for obtaining high-contrast TFT (thin film transistor) liquid crystal displays, which can completely interrupt unnecessary light of an area other than PIXEL electrodes of the liquid crystal panel, suppress TFT optical leak current, and depress nearly completely light reflection at a black matrix section, as well as to color filters for TFT liquid crystals, TFT liquid crystal displays for projection, and color TFT liquid crystal displays using the glass substrate for liquid crystals.
BACKGROUND OF THE INVENTION
In a color filter used for liquid crystal displays, it has been recommended to form black matrix with light-shielding film for filling up the space between pixels to have high-contrast images. Examples of such black matrix generally include the following.
1. Using ink or photosensitizer containing black pigment, black matrix is formed in a portion to be shielded on a transparent substrate.
2. A metal thin film such as chromium is formed on the entire transparent substrate by sputtering or evaporation method, and thereafter resist to shield light is formed by applying photosensitive resist on the metal thin film, exposing through a mask, and developing, and unnecessary portions are removed by etching to form black matrix.
However, the black matrix of the above 1 can suppress reflection of black matrix from the glass surface but the film thickness must be increased in order to achieve satisfactory light shielding effects. When the black matrix is printed with ink, satisfactory film thickness is unable to be obtained and it is difficult to suppress TFT optical leak current. It cannot form fine black matrix, neither. When photosensitizer is used to increase the film thickness, light does not penetrate inside the film which remains unexposed, due to the black color of the photosensitizer. When it is intended to achieve an optical density of 3.5 or higher, the black matrix film is too thick to maintain smoothness and becomes inadequate for assembling liquid crystal panels.
The black matrix of the above 2 is formed by evaporation or sputtering method, but because these have metallic luster, reflection of black matrix when seen from the glass surface is extremely large as 59%, causing the panel contrast to markedly lower. In addition, these forming methods require expensive vacuum equipment, and if optical density exceeding 3.5 is intended to achieve, long-term treatment is required, resulting in extremely poor productivity and high costs.
Consequently, the object of the present invention is to solve the problems described above and to provide glass substrate for liquid crystals with the total reflection ratio of 6% or less by seeing through from the glass surface and optical density of 3.5 or higher as well as color filters for TFT liquid crystals, TFT liquid crystal displays for projection, and color TFT liquid crystal displays using the glass substrate for liquid crystals.
DETAILED DESCRIPTION OF THE INVENTION
The present invention provides a glass substrate for liquid crystals, comprising a glass plate and a porous transparent active layer on the glass plate wherein said porous transparent active layer is prepared by hydrolyzing an organic metal compound represented by the general formula magnesium, calcium, zirconium, titanium, hafnium, germanium, yttrium, indium, aluminum, gallium, tin, and silicon, R.sub.1 and R.sub.2, the same or different, denote a hydrogen atom, an alkyl group, or an acyl group, X and Y, the same or different, denote a hydrogen atom, a chlorine atom, or a hydroxyl group, m, n, p, q stand for integers of 0 to 8, and m+n+p+q is equal to the valence of M, baking to form said porous transparent active coating layer, and the active coating layer contains therein black matrix having 6% or less of a total reflection ratio by seeing-through from the glass surface and 3.5 or higher of an optical density.
In the glass substrate for liquid crystals of the present invention, the metal may be se
REFERENCES:
Patent Abstracts of Japan, vol. 14, No. 94 (P-1010), Feb. 21, 1990 & JP-A-01 302 223 (Nissha Printing), Dec. 6, 1989 & Database WPI Week 9004, Derwent Publications Ltd., London, GB; AN 90-025334.
Patent Abstracts of Japan, vol. 13, No. 253 (P-883), Jun. 13, 1989 & JP-A-01 052 156 (Nippon Shashin Insa), Feb. 28, 1989 & Database WPI Week 8914, Derwent Publications Ltd., London, GB; AN 89-104652.
Patent Abstracts of Japan, vol. 13, No. 172 (P-862), Apr. 24, 1989 & JP-A-01 007 003 (Nissha Printing), Jan. 11, 1989.
Patent Abstracts of Japan, vol. 14, No. 48 (P-997), Jan. 29, 1990 & JP-A-01 277 804 (Seiko Epson), Nov. 8, 1989 & Database WPI Week 8951, Derwent Publicatons Ltd., London, GB; AN 89-373056.
Patent Abstracts of Japan, vol. 13, No. 443 (P-941), Oct. 5, 1989 & JP-A-01 170 901 (Nissha Printing), Jul. 6, 1989 & Database WPI Week 8933, Derwent Publications Ltd., London, GB; AN 89-237082.
Ahmad Nasser
Nissha Printing Co. Ltd.
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