Liquid crystal projector device

Details Liquid crystal projector device Liquid crystal projector device

2005-06-07

2005-06-07

Ton, Toan (Department: 2871)

Liquid crystal cells, elements and systems

Liquid crystal system

Projector including liquid crystal cell

C353S031000

Reexamination Certificate

active

06903785

ABSTRACT:
In a liquid crystal projector device, a first polarization beam splitter22separates an entering green light into first and second green lights perpendicular to each other, and a first liquid crystal element23modulates the first green light via a second polarization beam splitter24. Also, in the device of the present invention, while a first half-wave plate25revolves 90 degree a polarized plane of the second light separated by the first polarization beam splitter22, a second liquid crystal element26modulates the second green light via a third polarization beam splitter27, a second half-wave plate28revolves 90 degree a polarized plane of the second light transmitted through the third polarization beam splitter27, and a fourth polarization beam splitter29transmits the first green light transmitted through the second polarization beam splitter24and reflects the second green light form the second half-wave plate28.

REFERENCES:
patent: 6280034 (2001-08-01), Brennesholtz
patent: 6304302 (2001-10-01), Huang et al.
patent: 6490087 (2002-12-01), Fulkerson et al.
patent: 6636276 (2003-10-01), Rosenbluth
patent: 6672722 (2004-01-01), O'Connor et al.

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