Liquid crystal cells – elements and systems – Liquid crystal system – Projector including liquid crystal cell
Patent
1994-05-26
1997-03-11
Sikes, William L.
Liquid crystal cells, elements and systems
Liquid crystal system
Projector including liquid crystal cell
349 86, G02F 11335, G02F 11333
Patent
active
056107358
ABSTRACT:
A light valve projection apparatus includes a light source, a light valve used for forming optical images in response to a change in light scattering conditions in the light valve of light irradiated from the light source, a projection lens for projecting the optical images on a screen, and a shield for shielding the optical images formed at or near a pupil of the projection lens. If the brightness of light exiting from the light valve, which is in a light scattering state, in a direction tilted by .theta. degrees from a normal dissection of the light valve is assumed to be half as bright as the light outgoing in the normal direction at .theta..sub.1/2, .theta..sub.1/2 of the light valve is less than 23.degree.. The light valve may be a polymer dispersion liquid crystal display panel. When the polymer dispersion liquid crystal display panel is in a transparent state, light transmitted through the liquid crystal display panel is shielded by the shield, thus showing a black display on a screen. When the polymer dispersion liquid crystal display panel is in a light scattering state, light is scattered by the panel so that images formed in the panel are enlarged and projected by way of the projection lens onto the screen, thereby showing a bright white display.
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Kichiji Tsuzuki, Projection Type Display Device, Japanese Publication No. 4-147290, dated May 20, 1992.
Nobuo Minoura, Projection Type Liquid Crystal Display Device, Japanese Publication No. 4-194921, dated Jul. 14, 1992.
Junichi Nakamura, Projection Type Liquid Crystal Display Devie, Japanese Publication No. 4-240979, dated Aug. 28, 1992.
Ohmae Hideki
Takahara Hiroshi
Matsushita Electric - Industrial Co., Ltd.
Miller Charles
Sikes William L.
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