LCD projection system with polarization doubler

Details LCD projection system with polarization doubler LCD projection system with polarization doubler

1998-07-31

1999-03-23

Dowling, William

Optics: image projectors

Miscellaneous

353 20, 349 9, G03B 2114

Patent

active

058849912

ABSTRACT:
A projector system includes a lamp, a reflector collector optic, a light pipe, a Polarizing Beam Splitter (PBS), and an LCD (Liquid Crystal Display) panel. The light pipe has a square or octagonal entrance pupil, reflecting internal walls coated with a cold mirror coating, is tapered in shape, and has a rectangular exit pupil. The PBS converts an unpolarized beam from the exit pupil of the light pipe into a uni-polarized beam which it directs to the LCD panel.

REFERENCES:
patent: 5142387 (1992-08-01), Shikama et al.
patent: 5513023 (1996-04-01), Fritz et al.
patent: 5625738 (1997-04-01), Magarill
patent: 5777789 (1998-07-01), Lewis et al.

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