Patent ID: 7878661

Claim:
A projector comprising: a light source for emitting light; a color filter for splitting the light into three primary color lights; three polarizers placed in the respective paths of the color lights; three liquid crystal display modulators placed downstream of the respective polarizers and configured for modulating the color lights into color images; a color combiner for combining the color images into a final image; a projecting lens configured for projecting the final image; a controlling unit configured for analyzing a color temperature of the image; and an adjusting unit electrically connected to the controlling unit and configured to adjust the color temperature if the analyzed color temperature of the image is not essentially identical to a preset color temperature of the projector, the adjusting unit comprising an adjusting member and a driver, the adjusting member being placed upstream of one of the liquid crystal display modulators; the adjusting member being selected from the group consisting of a polarizer and a retarder; the driver being configured for driving the adjusting member to rotate under control of the controlling unit, thus adjusting the color temperature of the image by changing transmittance of the color light through the adjusting member and the corresponding polarizer.