Highly efficient single panel and two panel projection engines
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United States of America Patent
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Aug 4, 2009
Grant Date -
Sep 13, 2007
app pub date -
May 15, 2007
filing date -
May 16, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
Single imager projection systems suffer from low light throughput, compared to three imager systems, because only one color band is illuminated at any one time. As a result, there is a need to increase the operating efficiency of the single imager projection system. The invention is directed to the incorporation of a high extinction ratio pre-polarizer, such as a compensated, multi-layer polarizer, in a single or dual imager projection system. This permits illumination with low f-number illumination light, and thus increases the efficiency of the projection system. The pre-polarizer may be incorporated within a polarization recovery unit to further enhance system efficiency.
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