Compact rear projection system using birefringent optics
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United States of America Patent
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May 13, 2003
Grant Date -
N/A
app pub date -
Jul 7, 2000
filing date -
Jul 9, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A rear projection system provides for reduced cabinet depth by folding the optical path with polarization sensitive mirrors. In one aspect, the projector outputs linearly polarized light to a quarter-wave polarizing sheet, which circularly polarizes the projector output. A mirror directs the projected light back through the quarter-wave material to a polarization-dependent reflector. The light has a reflective polarization state. The polarization-dependent reflector reflects the light back to the quarter-wave material and mirror. Upon traversing the path a second time, the light is in a transmissive polarization state.
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