Optical: systems and elements – Polarization without modulation – Polarization by reflection or refraction
Reexamination Certificate
2005-11-01
2005-11-01
Juba, Jr., John (Department: 2872)
Optical: systems and elements
Polarization without modulation
Polarization by reflection or refraction
C359S490020, C359S490020, C359S634000, C353S020000, C353S031000, C353S034000, C349S009000
Reexamination Certificate
active
06961179
ABSTRACT:
Disclosed are color management architectures used in video projection systems including, for example, retarder stacks sensitive to the symmetries between input and output polarizer configurations that provide the polarization transformations that will comprise for skew rays, such that normal incidence performance is maintained for all incident light. Additionally, also disclosed are systems that utilize color selective polarization (CSP) filters and polarizing beam splitting elements such that an output analyzer is not required. One exemplary CSP architecture includes two CSPs, a single polarizing beam splitting element combination for splitting and combining light between two of the three panels, and an output polarizing beam splitting element used as an analyzer such that a single CSP is in the projection path. In all such architectures, an output CSP and clean up polarizer directly in line with the projection optics need not be included, thereby increasing transmission, improving imaging crispness, and reducing cost.
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International Search Report from copending PCT/US03/36803 application mailed Apr. 27, 2004.
Birge Jonathan R.
Chen Jianmin
Robinson Michael G.
Sharp Gary D.
Baker & McKenzie LLP
Colorlink, Inc.
Jr. John Juba
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