US Patent 7543943 Color permuting light projector

A light projector includes a light source configured to output a light beam, a display screen configured to display a color image containing pixels, and a color filter positioned between the light source and the projection screen. The light projector also includes a device for sequentially permuting colors of the pixels for a plurality of frames. The device includes at least one of a device for shifting a position of the color filter with respect to the light beam and a device for shifting a path of the light beam that passes through the color filter.