High contrast illumination system for video projector

Details High contrast illumination system for video projector High contrast illumination system for video projector

1994-05-10

1995-08-15

Cuchlinski, Jr., William A.

Optics: image projectors

Reflector

353122, 348771, 359224, 359291, G03B 2128

Patent

active

054424143

ABSTRACT:
A high contrast illumination system particularly suitable for use with light valves that have an array of reflective pivotable pixels. The light valve is arranged in light path which extends from a projection lamp to a projection lens. By the action of the pivotable pixels the light is directed either into the projection lens (ON) or away from the projection lens (OFF) to modulate the light with video information. An asymmetric aperture is disposed in the light path with its longitudinal axis located along the pivot axis of the pixels. This configuration provides maximum brightness without adversely affecting contrast. The system may be used in either a monochrome or color (RGB) system and in single or multiple light valve systems.

REFERENCES:
patent: 3989890 (1976-11-01), Nathanson et al.
patent: 4592628 (1986-06-01), Altman et al.
patent: 4615595 (1986-10-01), Hornpeck
patent: 4641193 (1987-02-01), Glenn
patent: 5159485 (1992-10-01), Nelson
patent: 5245369 (1993-09-01), Um et al.
patent: 5319214 (1994-06-01), Gregory et al.

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