Polarization arrangement
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United States of America Patent
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Jul 20, 2004
Grant Date -
Mar 27, 2003
app pub date -
May 16, 2002
filing date -
May 18, 2001
priority date (Note) -
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Abstract
A tilted polarization splitter (13) for use with a projection lens (15) and a light modulating panel (11) is provided. The polarization splitter has an ultra thin substrate (14) whose thickness is chosen so that the depth of focus of the projection lens in imager space is greater than the astigmatism produced by the splitter at its tilted angle. The polarization splitter can be a wire grid polarizer, polarization coating, or birefringence film carried by or formed on the ultra thin, plane parallel plate substrate.
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