Polarization conversion system

Details Polarization conversion system Polarization conversion system

2007-07-03

2007-07-03

Perkey, W. B. (Department: 2851)

Optics: image projectors

Polarizer or interference filter

C353S081000, C385S011000, C362S019000

Reexamination Certificate

active

10905397

ABSTRACT:
A polarization conversion system suited for LCD or LCoS-based projection applications is disclosed. The present invention polarization conversion system encompasses a light pipe with a rectangular light tunnel therein defined by four side reflection mirrors. A front reflection with an aperture thereon is mounted on an entrance face of the light pipe. A first polarization beam splitter is mounted on an exit face of the light pipe. A retardation plate, which is perpendicular to the exit face, is situated atop the first polarization beam splitter. A reflection mirror is situated atop the retardation plate. A second polarization beam splitter is mounted under the first polarization beam splitter and is opposite to the retardation plate.

REFERENCES:
patent: 5381278 (1995-01-01), Shingaki et al.
patent: 6969177 (2005-11-01), Li et al.
patent: 2001/0008470 (2001-07-01), Dewald
patent: 2002/0135874 (2002-09-01), Li
patent: 2003/0231262 (2003-12-01), Janssen
patent: 2004/0263789 (2004-12-01), Kim et al.
patent: 2005/0174641 (2005-08-01), Greenberg et al.

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