Patent ID: 7311404

Claim:
An optical projection apparatus comprising: a light source for emitting a light ray; a plurality of color wheels each including filter segments for transmitting, in accordance with color transmission characteristics thereof, the light ray emitted from the light source; a reflection display device for reflecting, while modulating or switching, the light ray transmitted through the plurality of color wheels; and a projection lens for projecting the light ray reflected from the reflection display device, wherein the plurality of color wheels comprises a first color wheel and a second color wheel; and the first color wheel includes three primary color filter segments and a white filter segment; the second color wheel consisting essentially of a white filter segment and a single colored filter segment consisting essentially of any one of the three primary color filter segments on the first color wheel; and the area of the white filter segment on the first color wheel is proportionally related to the area of the single colored filter segment on the second color wheel.