Optics: image projectors – Composite projected image – Multicolor picture
Patent
1998-02-27
1999-07-13
Dowling, William
Optics: image projectors
Composite projected image
Multicolor picture
353 20, 353 84, 349 9, 348743, G03B 2114
Patent
active
059216506
ABSTRACT:
A display is disclosed operating in a field-sequential color mode having first and second light valves which are simultaneously illuminated with different color beams having different polarizations 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 white light into the simultaneous different color beams. A retardation film for converting the polarization of colors reflected from the back surface from a first polarization to a second polarization. The wheel is rotated for sequentially illuminating the light valves with different colors of different polarizations simultaneously. The display further includes a polarizing beam splitter assembly for directing the different color light beams from the wheel to the light valves and directing the image forming light to the projection lens. The polarizing beam splitter assembly includes a plurality of polarizing beam splitter sub-assemblies. A clean-up polarizer for absorbing the first or second polarizations is located between two halves of the polarizing beam splitter assembly.
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Doany Fuad Elias
Rosenbluth Alan Edward
Dowling William
International Business Machines - Corporation
Shofi David M.
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