Optical system for liquid crystal projector

Details Optical system for liquid crystal projector Optical system for liquid crystal projector

1998-07-29

1999-08-10

Dowling, William C.

Optics: image projectors

Composite projected image

Multicolor picture

353 84, 349 8, G03B 2114

Patent

active

059347783

ABSTRACT:
An optical system for a liquid crystal projector in which the deterioration of the contrast of a projection screen is prevented. The optical system, comprising: a light source 1 for emitting a white light, an optical divider 4, 5 for dividing said white light into red, green and blue lights, a liquid crystal display panel 17, 18, 19 for modulating each of said red, green and blue light, a polarizer 14, 15, 16 for polarizing each of said modulated red, green and blue light, an optical synthesis element 21 for synthesizing each of said polarized red, green and blue light, and a green-light removing element 23, 24, 25 for removing green light disposed between said liquid crystal display panel for said blue light and said color synthesis element. The green-light removing element 23, 24, 25 removes is provided between the blue-light modulating LCD panel 19 and the color synthesis element 21. Therefore the deterioration of the contrast of the blue-light modulating LCD panel 19 can be prevented.

REFERENCES:
patent: 5135300 (1992-08-01), Toide et al.
patent: 5605390 (1997-02-01), Brice et al.
patent: 5743610 (1998-04-01), Yajima et al.
patent: 5743611 (1998-04-01), Yamaguchi et al.

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