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United States of America Patent
Stats
-
Oct 22, 2002
Grant Date -
N/A
app pub date -
Jun 20, 2000
filing date -
Jun 21, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
White light L11 emitted from a white light source 11 is split into R, G, B effective light beams L12 and reflected in an opposite direction with respect to the white light source 11 by a reflection type color wheel 17. The beams strike a spatial light modulator where they are modulated to R, G, B optical images L13, and the images are projected to a screen by a projection lens 18. Consequently, the diameter of the color wheel can be made larger without increasing the overall height of the apparatus. Further, unwanted light L14 transmitted through the reflection type color wheel 17 is prevented from causing heating or is transformed to electricity by a solar battery etc.
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