Optics: image projectors – Color filter
Patent
1998-01-30
1999-01-26
Dowling, William
Optics: image projectors
Color filter
353 31, 353 20, 348743, G03B 2114
Patent
active
058631259
ABSTRACT:
A display is disclosed operating in a field-sequential color mode having at least two light valves which are simultaneously illuminated with different color beams having the same polarization provided from a color wheel. The light valves provide an image forming light to a projection lens for projecting the image forming light onto a screen. The wheel has front and back surfaces which are displaced from each other and have segments of different colors for separating a polarized light into the simultaneous different color beams when the different colors of the front and back color segments overlap. The two beams from the front and back surfaces are parallel to each other when the front and back surfaces are parallel. Alternatively, when the front and back surfaces meet to form a wedge, the two beams have different directions. The front and back color segments are offset relative to each other and each has clear segments so that one colored beam is provided to one of the light valves. The front and back clear segments are also offset relative to each other. The wheel is rotated for sequentially illuminating the light valves with different colors simultaneously.
REFERENCES:
patent: 3597069 (1971-08-01), Heinonen
patent: 5463433 (1995-10-01), Koo
patent: 5517340 (1996-05-01), Doany et al.
patent: 5612753 (1997-03-01), Poradish
patent: 5668572 (1997-09-01), Meyer et al.
patent: 5777694 (1998-07-01), Poradish
Dowling William
International Business Machines - Corporation
Morris Daniel P.
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