Patent ID: 6292234
Filing Date: 2001-09-18
Classification: G02F,H04N

Abstract:
A projection type color liquid crystal display apparatus comprising:light collimation means for producing collimated light at a given point in time;main-wavelength band separation means for receiving the collimated light from the light collimation means and producing a plurality of light beams having respectively different wavelength bands and exiting at respectively different angles;sub-wavelength band separation means provided adjacent the main-wavelength band separation means, the sub-wavelength band separation means receiving the collimated light from the light collimation means and producing at least one light beam having the same wavelength band as the wavelength band of at least one of the light beams from the main-wavelength band separation means;wherein the sub-wavelength band separation means receives the collimated light produced at the given point in time by the light collimation means simultaneously with the main-wavelength band separation means, and wherein the sub-wavelength band separation means produces the at least one light beam simultaneously with the beams produced by the main wavelength band separation means to supplement the light from the main wavelength band separation means;a liquid crystal display device for receiving the light beams from the main-wavelength band separation means and the light beams from the sub-wavelength band separation means and modulating the light beams; andan optical system for receiving the light beams transmitted through the liquid crystal display device and thereby projecting an image.