Liquid crystal cells – elements and systems – Liquid crystal system – Projector including liquid crystal cell
Patent
1993-10-07
1997-08-19
Sikes, William L.
Liquid crystal cells, elements and systems
Liquid crystal system
Projector including liquid crystal cell
353 37, 349 67, G02F 11335, H04N 931
Patent
active
056594097
ABSTRACT:
A projection type display apparatus comprising a light source apparatus which is provided with an elliptic mirror 12, a light source 11 disposed at the first focal point, a cone-like material disposed at the second focal point, a condenser lens 13, display elements 15R-15B, a color separating and synthesizing optical system, second condenser lenses 16R-16B and a projection lens 19. The cone-like material is one selected from the group of a convex cone lens, a concave cone lens 2, a convex cone-like reflector and a concave cone-like reflector 20. In the projection type display element, light emitted from the light source is introduced into the cone-like material and is emitted as divergent light through the conical surface of the cone-like material. The divergent light is introduced into the condenser lens 13 so that the light is rendered to be parallel light fluxes, which are color-separated and introduced into the display elements 15R-15B disposed for each color in order to form light fluxes of display colors. The light fluxes are again subjected to color synthesization, and the synthesized light is projected as a full color picture image on a screen through the projection lens 19. The projection type display apparatus provides a display having uniformity, a good contrast ratio and brightness.
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Ooi Yoshiharu
Serizawa Shigeyuki
Sonda Yoshiyuki
Wakabayashi Tsuneo
AG Technology Co., Ltd.
Duong Tai V.
Sikes William L.
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