Highly efficient single panel and two panel projection engines

Details Highly efficient single panel and two panel projection engines Highly efficient single panel and two panel projection engines

2007-05-15

2009-08-04

Mahoney, Christopher E (Department: 2862)

Optics: image projectors

Polarizer or interference filter

C353S031000

Reexamination Certificate

active

07568804

ABSTRACT:
Single imager projection systems suffer from low light throughput, compared to three imager systems, because only one color band is illuminated at any one time. As a result, there is a need to increase the operating efficiency of the single imager projection system. The invention is directed to the incorporation of a high extinction ratio pre-polarizer, such as a compensated, multi-layer polarizer, in a single or dual imager projection system. This permits illumination with low f-number illumination light, and thus increases the efficiency of the projection system. The pre-polarizer may be incorporated within a polarization recovery unit to further enhance system efficiency.

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Duelli M. et al.: “Polarization Recovery System Based on Light Pipes” Proceedings of the SPIE, SPIE, Bellingham, VA, US, vol. 4657, Jan. 20, 2002, pp. 9-16, XP009009490 ISSN: 0277-786X.
[Online] XP002289044 Apr. 5, 2003 Retrieved for the Internet: URL:http://web.archive.org/web/20030504210709/http://optice.unaxis.com/pod/SysDirs/publish/release/106RE.pdf.

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