Optical filter employing holographic optical elements and image generating system incorporating the optical filter
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United States of America Patent
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Jan 13, 2004
Grant Date -
N/A
app pub date -
Jan 5, 2000
filing date -
Jan 7, 1999
priority date (Note) -
Expired
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Abstract
The present invention relates to a solid state filter used in sequentially illuminating an image display, directly or indirectly, with first, second, and third bandwidth light. The solid state filter includes at least one hologram that is switchable between active and inactive states. While in the active state, the at least one switchable hologram diffracts a first bandwidth light. In contrast, the switchable hologram transmits the first bandwidth light without substantial alteration when operating in the inactive state. In one embodiment, the diffracted first bandwidth light is used to illuminate a monochrome image presented on a display device. In another embodiment, the transmitted first bandwidth light is used to illuminate the monochrome image presented on the image display.
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