LCD having a polarization or diffusion plate with an irregularly

Details LCD having a polarization or diffusion plate with an irregularly LCD having a polarization or diffusion plate with an irregularly

1996-01-11

1997-11-25

Sikes, William L.

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

349110, 349112, G02F 11335, G02F 11333

Patent

active

056917880

ABSTRACT:
A liquid crystal display with an improved viewing angle is disclosed which prevents gray scale inversion within a range of 60.degree. in every direction because the change of a gray level according to the viewing angle is small. Light transmitted through the liquid crystal is scattered by a diffusion plate so that the brightness in front can be improved instead of narrowing the viewing angle, or uniform screen quality can be obtained by widening the viewing angle. The diffusion coefficient of the diffusion plate can be easily controlled. Further, it is possible to prevent a decrease in contrast due to external ambient light by screen-printing a black matrix pattern or atomizing a black dye on the diffusion plate.

REFERENCES:
patent: 4984872 (1991-01-01), Vick
patent: 5150138 (1992-09-01), Nakanishi et al.
patent: 5159478 (1992-10-01), Akiyama et al.
patent: 5161041 (1992-11-01), Abileah et al.
S. Kaneko et al., "Wide-Viewing-Angle Improvements for AMLCDs", SID 93 Digest, pp. 265-268.
Y. Mesaki et al., "New Backlighting Technologies for LCDs", SID 94 Digest, pp. 281-284.
"Up-to-Date Trends of Polarization and Phase Difference Plate", Semiconductor World, p. 256.

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