Patent ID: 7267441
Filing Date: 2007-09-11
Classification: G03B,H04N,Y10S

Abstract:
1. A projection display including first through third light source units radiating first through third light beams having different colors, respectively, a light path combining unit to combine paths of the first through third light beams, an optical modulator to sequentially modulate the first through third light beams according to image information, and a projection lens unit to magnify and project the modulated light beams onto a screen, the light path combining unit comprising: a first prism including first and second incidence surfaces, through which the first and second light beams are incident, respectively, a first emission surface, and a first selective reflection surface to transmit the second light beam toward the first emission surface; and a second prism including a third incidence surface, through which the third light beam is incident, a fourth incidence surface, through which the first and second light beams emitted through the first emission surface are incident, a second emission surface, and a second selective reflection surface to reflect the third light beam and transmit the first and second light beams toward the second emission surface.