Optical systems for reflective LCD's
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United States of America Patent
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-
Dec 3, 2002
Grant Date -
N/A
app pub date -
Apr 10, 2000
filing date -
Apr 21, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Optical systems for use with reflective LCDs (8,9,32,34,36) are provided. The systems include a polarization beam splitter (5) which can be composed of polarization beam splitting cubes (26) having sheet polarizers (30) and/or half wave plates (28) at their mating surfaces. By orienting the half wave plates (28) so that they convert S polarization to P polarization and P polarization to S polarization, the polarization beam splitter (5) can provide a high contrast ratio at a viewing screen between light from the 'on' and 'off' pixels of the reflective LCDs (8,9,32,34,36).
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