Patent ID: 7369318

Claim:
A display device, comprising: a condenser unit for converging polarized light output from a plurality of light sources, and outputting the converged polarized light; an illumination lens system for converting the polarized light, which is output from the condenser unit, into linear parallel light; an optical modulation system for producing diffracted light beams having a plurality of diffraction orders by optically modulating the polarized light having each wavelength that is output from the illumination lens system; a filter system for passing some of the diffracted light beams having desired orders therethrough; a projection system for focusing the diffracted light beams passed through the filter system, and projecting the focused diffracted light beams onto a screen, and wherein the optical modulation system includes: a plurality of diffractive light modulators for producing the diffracted light beams having the plurality of diffraction orders by optically modulating the polarized light having each wavelength that is output from the illumination lens system; a diffracted light separator for passing polarized beams, which are output from the illumination lens system, therethrough, and reflecting the diffracted light beams, which are output from the diffractive light modulators, toward the filter system; and a polarized beam separator for separating the polarized beams incident from the diffracted light separator on a wavelength basis and then causing the separated polarized beams to be incident on corresponding diffractive light modulators, and converging the diffracted light beams output from the plurality of diffractive light modulators and then outputting the converged light beams to the diffracted light separator.