Polarization Conversion System for a PICO-Projector
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United States of America Patent
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Issued Date -
Aug 1, 2013
app pub date -
Jan 31, 2013
filing date -
Feb 1, 2012
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Abandoned
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Abstract
An illumination system for a pico-projector that provides polarization conversion includes the combination of an optical element with a series of stacked, elongated PBSs, where alternate ones of the PBSs have a half-wave plate film applied to a back side thereof and a retarder stack film (RSF) that flips or passes different linear polarization orientations based on the wavelength of light. This combination is placed at a position in the illumination system where the impinging light is collimated to at least some degree.
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