Optical projection engine device having a polarizing beam splitter and a control providing modulation instructions to modulation imagers
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United States of America Patent
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Mar 13, 2012
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N/A
app pub date -
Nov 5, 2009
filing date -
Nov 6, 2008
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Abstract
An optical projection engine device uses a symmetrical wire grid polarizing beam splitter (PBS) that splits incident illumination to a symmetrical pair of polarized light beams in two orthogonal polarization states, one by reflection and the other by transmission, for illuminating a pair of reflective modulation imagers respectively. In identical geometric configuration, the two synchronized reflective modulation imagers polarization modulate polarized light beams as received, and reflect them back towards the PBS, which through transmission and reflection respectively, combines and projects two modulated light beams through a projection lens system to form a pair of spatially overlapped illumination images of aligned pixels with the same image in two orthogonal polarization states on a projection screen. The device jointly provides improvement optical efficiency and expanded function to three dimensional stereoscopic displays.
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