Method and apparatus for increasing microdisplay black state in light management systems and flexibility to utilize polarized or unpolarized input light
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United States of America Patent
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Oct 9, 2007
Grant Date -
Jan 15, 2004
app pub date -
Mar 5, 2003
filing date -
Mar 5, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A dichroic is positioned to separate color beams of polarized input light. The color beams are directed to microdisplays that contain correspondingly colored content in a kernel of a Light Management System (LMS). Adjustment of a voltage amplitude of the microdisplays is set to produce a maximum black state of the LMS. In one embodiment, a passive nematic liquid crystal device is utilized as a quarter waveplate. A thickness of a liquid crystal layer (d) is matched to a birefringence (.DELTA.n) of the nematic such that retardation d.DELTA.n =1/4.lamda..
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