Liquid crystal cells – elements and systems – Particular structure – Particular illumination
Patent
1995-09-01
1997-02-04
Sikes, William L.
Liquid crystal cells, elements and systems
Particular structure
Particular illumination
349 66, 349 95, 349112, G02F 11335
Patent
active
056004567
ABSTRACT:
A transmission liquid crystal display comprises a liquid crystal panel including at least two substrates spaced apart from one another through spacers to confine a liquid crystal between the two substrates; a surface light source provided at a first side of the liquid crystal panel; and an optical diffusion lens having a plate-like shape provided at a second side of the liquid crystal panel, the lens having first and second surfaces, the first surface facing to a display screen and the second surface facing to a liquid crystal panel, entire parts of the first surface is flat, and the second surface comprises alternating flat portions and convex or concave portions having a predetermined curvature, the convex or concave portions having a difference in level of a top portion thereof from the flat portions, the convex or concave portions being arranged at a predetermined pitch, wherein a ratio of the difference in level to the pitch is in the range from 2.9:10 to 0.8:10.
REFERENCES:
patent: 5151801 (1992-09-01), Hiroshima
patent: 5161041 (1992-11-01), Abileah et al.
Kashimoto Koji
Maruyama Muneo
NEC Corporation
Sikes William L.
Trice Ron
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