Patent ID: 6981771

Claim:
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.