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

2007-07-03

2007-07-03

Mahoney, Christopher (Department: 2851)

Optics: image projectors

Polarizer or interference filter

C353S031000

Reexamination Certificate

active

10439449

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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