an optical processor includes a light source , a grating device , a first lens , a reflector , a second lens , an array of mirror cells , a color wheel , and a third lens . the light source is for generating a number of light beams . the grating device is for reflecting and dispersing the generated light beams . the first lens is for imaging the reflected and dispersed light beams . the reflector is for reflecting the imaged light beams . the second lens is for correcting any aberration of the reflected light beams . the array of mirror cells is for reflecting the light beams received from the second lens . the color wheel is for coloring the reflected light beams . the third lens is for projecting the colored light beams onto a display .