Projection display device
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United States of America Patent
Stats
-
Aug 10, 2004
Grant Date -
Dec 5, 2002
app pub date -
May 22, 2002
filing date -
May 22, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a projection display device comprising an illumination system having a light source and an optical guiding means for providing an illumination beam, and an image display system for modulating the illumination beam with image information and projecting the image on a screen, and means for selectively transmitting a portion of the illumination beam having a desired characteristic to the image display system, and means for feeding back an unused portion of the illumination beam to the illumination system for re-illumination of the image display system. In order to improve the efficiency of the projection display device, a reflection means is provided at a portion of an entrance surface of the light-guiding means and the unused portion of the illumination beam is fed back into the light-guiding means.
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Cited Art Landscape
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