Patent ID: 7564608

Claim:
A raster scanning-type display device, comprising: a plurality of light sources for emitting a plurality of beams of light having respective colors; a diffractive light modulator comprising a plurality of elements with colors respectively assigned to the elements, and configured to modulate incident light while moving the elements according to external control signals and then to emit a plurality of beams of light having respective colors and each having a plurality of diffraction orders when the incident light having a plurality of colors is incident on corresponding elements; a plurality of illumination optical units for radiating the plurality of beams of light having respective colors, emitted from the light sources, onto the corresponding elements of the diffractive light modulator; a combining unit for combining the plurality of beams of light having respective colors and each having a plurality of diffraction orders, formed by the diffractive light modulator, together; a Schlieren optical unit for selecting diffracted light having one or more desired diffraction orders from the plurality of beams of light having respective colors and each having a plurality of diffraction orders, and passing the selected diffracted light therethrough; and a scanning optical unit for scanning the diffracted light, passed through the Schlieren optical unit, onto a screen in a raster scanning fashion.