Optical: systems and elements – Optical modulator – Light wave temporal modulation
Reexamination Certificate
2005-12-08
2009-06-02
Martinez, Joseph (Department: 2873)
Optical: systems and elements
Optical modulator
Light wave temporal modulation
C359S301000, C359S513000, C353S020000, C349S009000, C349S075000
Reexamination Certificate
active
07542194
ABSTRACT:
A projection system includes an image-forming device and a polarizing beamsplitter. Illumination light illuminates the image-forming device via the first polarizing beamsplitter. A retardation element is disposed between the image-forming device and the polarizing beamsplitter. A bias controller applies a bias to pixels of the image-forming device in the dark state so as to substantially maximize contrast in image light reflected from image-forming device. In some arrangements, the volume between the polarizing beamsplitter and the image-forming device is sealed, with the retarding element being disposed within the sealed volume and being attached to either the polarizing beamsplitter or the image-forming device.
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U.S. Appl. No. 11/088,153, filed Mar. 25, 2005, entitled Stress Birefringence Compensation in Polarizing Beamsplitters and Systems Using Same.
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Aastuen David J. W.
Bruzzone Charles L.
Keyes Michael P.
3M Innovative Properties Company
Martinez Joseph
LandOfFree
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