Light source apparatus using a cone-shaped element and an applie

Details Light source apparatus using a cone-shaped element and an applie Light source apparatus using a cone-shaped element and an applie

1997-01-10

1998-12-01

Sikes, William L.

Liquid crystal cells, elements and systems

Liquid crystal system

Projector including liquid crystal cell

349 67, 362308, G02F 11335, H04N 931, G03B 2120

Patent

active

058446389

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.

REFERENCES:
patent: 4498742 (1985-02-01), Vehara
patent: 5398081 (1995-03-01), Jones
patent: 5422691 (1995-06-01), Ninomiya et al.
patent: 5692819 (1997-12-01), Mitsutake et al.
patent: 5719704 (1998-02-01), Shiraishi et al.

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