Optical projection system and method

Details Optical projection system and method Optical projection system and method

2006-08-15

2006-08-15

Koval, Melissa Jan (Department: 2851)

Optics: image projectors

Polarizer or interference filter

C353S031000, C353S033000, C353S034000, C353S037000, C353S081000, C349S005000, C349S008000, C349S009000, C359S486010

Reexamination Certificate

active

07090350

ABSTRACT:
An optical projection system can receive a red light beam, green light beam, and blue light beam. The optical projection system includes a color-combination prism, and the light beams respectively enter the color-combination prism from three surfaces and are combined into a mixed light beam, which exits from another surface. A projection lens set receives the mixed light beam to perform the projection. Each of the light beams further includes a liquid crystal reflection panel and a wire grid polarizer (WGP). The liquid crystal reflection panel is parallel to the corresponding surfaces of the color-combination prism. In the design, before the light beam entering the color-combination prism, they are first reflected by the WGP onto the liquid crystal reflection panel, and the liquid crystal reflection panels respectively with a polarizing state reflect the light beams, passing through the WGP and directly propagating toward the color-combination prism.

REFERENCES:
patent: 6666556 (2003-12-01), Hansen et al.
patent: 6769772 (2004-08-01), Roddy et al.
patent: 2002/0118375 (2002-08-01), Ramanujan et al.
patent: 2004/0066492 (2004-04-01), Nakashima et al.
patent: 2004/0109329 (2004-06-01), Kato
patent: 2005/0024591 (2005-02-01), Lian et al.

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