Liquid crystal device using a Fresnel collimating lens for impro

Details Liquid crystal device using a Fresnel collimating lens for impro Liquid crystal device using a Fresnel collimating lens for impro

1987-07-02

1988-07-12

Miller, Stanley D.

350445, 350452, 350334, 350345, G02F 113, G02B 1700, G02B 308

Patent

active

047566043

ABSTRACT:
There is disclosed a liquid crystal display device having very uniform contrast ratio for use with such a projector as an overhead projector. The liquid crystal display device comprises a liquid crystal display cell having a thin film of liquid crystal material sandwiched between transparent electrodes formed on opposing transparent substrates and a Fresnel collimating lens disposed before the cell in the direction of light traveling through the cell and for collimating the light in parallel light beams from a condenser lens in the projector.

REFERENCES:
patent: 3731986 (1973-05-01), Fergason
patent: 3844650 (1974-10-01), Nicholson et al.
patent: 4613207 (1986-09-01), Fergason
patent: 4653861 (1987-03-01), Kando et al.
patent: 4660936 (1987-04-01), Nosker
patent: 4693557 (1987-09-01), Fergason
patent: 4704004 (1987-11-01), Nosker

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