Liquid crystal projector

Details Liquid crystal projector Liquid crystal projector

1987-03-12

1988-09-13

Haroian, Harry N.

Optics: image projectors

Miscellaneous

353 38, 353102, 353 84, 353 95, G03B 2100

Patent

active

047705256

ABSTRACT:
In a liquid crystal projector wherein a light source is arranged behind a transmission liquid crystal display panel having a rectangular display portion, an image displayed on the liquid crystal display panel is enlarged by a projection lens, and an enlarged image is projected on the screen located in front of the liquid crystal display panel, a linear Fresnel lens is arranged between the light source and the liquid crystal display panel to narrow illumination light beam from the light source along only the widthwise direction of the rectangular display portion. When the illumination light beam from the light source is narrowed along only the widthwise direction of panel, the amount of unused light beam emitted outside the long sides of the display portion can be reduced, and the light beam from the light source can be effectively utilized for image projection.

REFERENCES:
patent: 1762932 (1930-06-01), Mihalyi
patent: 3844650 (1974-10-01), Nicholson
patent: 3895866 (1975-07-01), De Quervain
patent: 4012136 (1977-03-01), de la Croix et al.
patent: 4294524 (1981-10-01), Stolov
patent: 4368963 (1983-01-01), Stolov
patent: 4613207 (1986-09-01), Fergason
patent: 4671634 (1987-06-01), Kizaki
Patent Abstracts of Japan, vol. 8, No. 113 (P-276) (1550), 26th May 1984; & JP-A No. 59 19924 (Aporon Ongaku Kogyo) 01-02-1984.
Patent Abstracts of Japan, vol. 8, No. 92 (P-271) (1529), 27th Apr. 1984; & JP-A-59 7928 (Alps Denki) 17-01-1984.
Patent Abstracts of Japan, vol. 9, No. 116 (P-357) (1839), May 1985; & JP-A-No. 60 2916 (Suwa Seikosha) 09-01-1985.

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