Projected image blending for multiple images

Details Projected image blending for multiple images Projected image blending for multiple images

1997-07-07

2000-01-25

Dowling, William

Optics: image projectors

Composite projected image

353 94, 353 97, G03B 2114

Patent

active

060171235

ABSTRACT:
A projection system includes first and second light valve projectors which project a composite image onto a screen by overlapping the first and second images in an overlap region. Each projector includes a light source, a light valve for reflecting or transmitting image light, a condensing lens for directing light from the light source to the light valve, and a projection lens. An improved light valve projector includes a blending device, associated with the first and second light valve projectors and being located in the path of the light between the light valve and the projection lens, the light source and the condensing lens, or the projection lens and the screen. The blending device smoothes off-state and on-state illumination levels in the overlap region without reducing the contrast ratio of said light valve projector. The blending device includes physical devices such as filters, solid masks, and/or a combination thereof as a substitute for electronic blending. By physically blending off-state illumination levels, the present invention avoids loss of contrast ratio associated with electronic blending.

REFERENCES:
patent: 4505558 (1985-03-01), Albers et al.
patent: 4974073 (1990-11-01), Inova
patent: 5077154 (1991-12-01), Corley
patent: 5136390 (1992-08-01), Inova et al.
patent: 5437946 (1995-08-01), McCoy
Patent Abstracts of Japan, vol. 096, No. 003, Mar. 29, 1996 and JP 07 302064 A, Canon Inc., Nov. 14, 1995 *abstract*.

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