US 6,981,771 B1 | ||
Rear projection display device | ||
Kazuhiro Arai, Kadoma (Japan); and Syoichi Yoshii, Fujiidera (Japan) | ||
Assigned to Sanyo Electric Co., Ltd., Osaka (Japan) | ||
Filed on Jun. 30, 2000, as Appl. No. 9/608,067. | ||
Claims priority of application No. 11-187893 (JP), filed on Jul. 01, 1999; and application No. 11-187894 (JP), filed on Jul. 01, 1999. | ||
Int. Cl. G03B 21/22 (2006.01); G03B 21/28 (2006.01); G03B 21/14 (2006.01); G03B 21/56 (2006.01); G02F 1/1335 (2006.01) |
U.S. Cl. 353—74 | 16 Claims |
1. A rear projection display device comprising a light source lamp, color splitting means for splitting light emitted from
the light source lamp into a plurality of color components, a plurality of liquid crystal panels for optically modulating
each color light split by the color splitting means, color synthesizing means for synthesizing each of the color light modulated
by the liquid crystal panels, and projection means for projecting image light which is color-synthesized by the color synthesizing
means on a screen from slantly above or slantly below,
wherein a polarization direction of at least one color component out of the image light irradiated on the screen is parallel
to a vertical cross section of the screen, and the polarization direction of the at least one color component is manipulated
to reduce reflection on the screen and to improve brightness,
wherein the polarization direction of at least the green component out of the image light irradiated on the screen is parallel
to the vertical cross section of the screen,
wherein polarization direction adjusting means is provided for adjusting a polarization direction of at least the green component
out of the image light synthesized by the color synthesizing means so that the polarization direction of at least the green
component is parallel to the vertical cross section of the screen.
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