Projector

Details Projector Projector

2007-05-08

2007-05-08

Perkey, W. B. (Department: 2851)

Optics: image projectors

Composite projected image

Multicolor picture

C353S034000, C353S037000, C353S082000, C349S008000, C348S603000, C348S678000, C348S687000, C348S751000, C348S757000, C348S758000, C359S242000, C359S639000, C345S077000, C345S589000, C345S617000, C345S690000

Reexamination Certificate

active

11043465

ABSTRACT:
Aspects of the invention provide a projector capable of comparatively easily achieving a contrast ratio higher than the original contrast ratio of the liquid-crystal light valve by a simple mechanism. The illumination light modulated by liquid-crystal light valves, i.e., image light, can be combined together in a cross dichroic prism, and then light intensity of suitable pixels is reduced by a proper amount by a liquid-crystal light valve, and then sent to a projection lens. The image light entering the projection lens can be projected to a projection surface. Because the light intensity of the image light formed by the liquid-crystal light valves is appropriately attenuated at suitable pixel areas by the liquid-crystal light valve, image light projection with a contrast ratio exceeding by far the contrast ratio achievable by the liquid-crystal light valves alone is possible due to cumulative light-intensity adjustment.

REFERENCES:
patent: 6327093 (2001-12-01), Nakanishi et al.
patent: 6943756 (2005-09-01), Choi
patent: 2001-100699 (2001-04-01), None
patent: 2002-365720 (2002-12-01), None

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