Optical unit and projection-type image display apparatus using the same
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United States of America Patent
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Aug 14, 2007
Grant Date -
Sep 29, 2005
app pub date -
Feb 18, 2005
filing date -
Mar 3, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A technique according to the present invention allows a projection-type image display system to suppress the temperature rise of the polarization split devices and secure high image quality. Polarization split means has a polarization split device arranged in a medium with a refractive index larger than 1. The polarization split device has a polarization split surface on which a diffractive grating structure is formed to polarize and split light. An air layer is formed in contact with the polarization split surface. In a projection type image display apparatus or an optical unit using this apparatus, light fluxes are polarized and split by the polarization split means before irradiated to light valves and after modulated by the light valves and color composition is made from the polarized and split light fluxes before enlarged and projected by a projection lens unit.
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