Patent ID: 6404552
Filing Date: 2002-06-11
Classification: G02B,H04N

Abstract:
A projection type display device comprising:a color separating/synthesizing optical system comprising prisms for making color separations of a light source beam via a polarization beam splitter comprising prisms; light valves, disposed respectively for color light beams color-separated by the color separating/synthesizing optical system, upon which the respective color-separated light beams are incident, the light beams exiting from said light valves being synthesized by said color separating/synthesizing optical system, and the synthesized light beam exiting; said polarization beam splitter analyzing the synthesized light beam and taking out the analyzed light beam; and a projection lens for projecting the analyzed light beam on a screen, wherein a normal line to an outgoing surface of one of said prisms of said polarization beam splitter with respect to the light source beam exiting toward said color separating/synthesizing optical system from said polarization beam splitter has a predetermined angle larger than zero degree with respect to an optical axis of the light source beam, and an incident surface of said color separating/synthesizing optical system, with respect to the light source beam exiting toward said color separating/synthesizing optical system from said polarization beam splitter, is disposed in parallel to the outgoing surface of said polarization beam splitter.