Patent ID: 8294834

Claim:
A projection display apparatus, comprising: a light source; separating means for separating light generated by the light source into primary color lights; mixing means; a spatial light modulation device disposed between the separating means and the mixing means for modulating, based on a video signal, each of the primary color lights for color display emitted from the light source; the mixing means mixing each of the primary color lights modulated by the spatial light modulation device; projecting means for projecting, onto a screen, the mixed primary color lights; and correcting means for correcting, based on a given correction value, the video signal for each of the primary color lights to reduce misregistration between the primary color lights projected on the screen, and for supplying the corrected video signal to the spatial light modulation device, wherein the correcting means corrects the video signal such that a group of correction target points selected in a projected image on the screen are collectively processed as a single correction unit with use of a single correction value, and wherein the correcting means white balance adjusts and gamma corrects the video signal for each of the primary color lights and then corrects, based on the given correction value, the white balance adjusted and gamma corrected video signal for each of the primary color lights to reduce misregistration between the primary color lights projected on the screen.