Imaging light source with polarization and color recovery
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United States of America Patent
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Dec 25, 2007
Grant Date -
Aug 24, 2006
app pub date -
May 17, 2002
filing date -
May 17, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention provides a polarized colored light source for a display system in which light of other polarization states and colors are recycled. The color can be scrolled synchronously with a display. In one embodiment, the invention includes a tunnel having an entrance aperture facing a lamp to receive light having multiple polarization states from the lamp and direct the light from the lamp to an exit aperture opposite the entrance aperture, the tunnel having a reflective face about the entrance aperture to reflect light within the tunnel toward the exit aperture, a reflective polarizer to reflect light of one polarization state toward the entrance aperture and transmit light of another polarization state, and a color reflector to transmit light within one color range and reflect light of another color range toward the entrance aperture.
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