LED illumination system with polarization recycling
Number of patents in Portfolio can not be more than 2000
United States of America
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Jul 12, 2011
Issued Date -
N/A
app pub date -
Jul 2, 2007
filing date -
Jul 2, 2007
priority date (Note) -
Withdrawn
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Abstract
A light engine has a light source front surface that emits non-collimated light. A collection lens collects the non-collimated light and provides incompletely collimated light. A collimating lens receives the incompletely collimated light and provides a collimated image. A non-orthogonal polarizing filter receives the collimated image and passes a polarized portion of the collimated image as a direct component of the polarized light engine image. The non-orthogonal polarizing filter reflects a recycled image back to the front surface. The non-orthogonal shape of the polarizing filter is selected according to the pattern of light on the light source front surface.
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