Patent ID: 6698893
Filing Date: 2004-03-02
Classification: G02B,H04N

Abstract:
A projection display apparatus comprising:a light source for emitting light; a color separator for separating the light emitted from the light source into first, second, and third light components corresponding to three primary colors; first, second, and third light valves for modulating the first, second, and third light components, respectively; a color synthesizer for chromatically synthesizing the first, second, and third light components, which have been respectively modulated by the light valves, to form synthesized light; and a projecting section for projecting the synthesized light, wherein the color synthesizer comprises multiple prisms, wherein said multiple prisms have first and second dichroic surfaces having different wavelength selection characteristics from each other, and wherein said multiple prisms have a prism surface that satisfies a total reflection requirement for the third light component, and wherein (i) the first dichroic surface is at a 40Â° to 50Â° angle relative to an optical axis of the projecting section, and is for synthesizing the first and second light components, (ii) the second dichroic surface is for synthesizing the first and second light components, which have been synthesized by the first dichroic surface, and the third light component after being reflected by said prism surface, and (iii) the first, second, and third light components thus synthesized by the first and second dichroic surfaces exit the color synthesizer via said prism surface.