Light Recycling System with an Inorganic, Dielectric Grid Polarizer
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United States of America Patent
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Issued Date -
Mar 6, 2008
app pub date -
Aug 31, 2006
filing date -
Aug 31, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A light recycling system includes a light source capable of producing a visible light beam. An inorganic, dielectric grid polarizing beam splitter is disposable in the light beam to separate the light beam into two light beams of orthogonal polarization orientation including a transmitted beam and a reflected beam. The grid polarizer includes a stack of film layers disposed over the substrate. Each film layer is formed of a material that is both inorganic and dielectric. Adjacent film layers have different refractive indices. At least one of the film layers is discontinuous to form a form birefringent layer with an array of parallel ribs with a period less than approximately 260 nm. Light reorientation means is disposable in the transmitted or reflected beam for changing the polarization orientation of the transmitted or reflected beam.
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