Patent ID: 6932478

Claim:
A reflective type light valve projection device comprising: an incident light source for providing an incident light; a first dichroic beam splitter/combiner located on the optical path of said incident light for reflecting a first primary color to separate said first primary color from a second and a third primary colors; a second dichroic beam splitter/combiner located on the optical path of said incident light for separating the second and third primary colors passing through said first dichroic beam splitter/combiner, each of said first and second dichroic beam splitter/combiners having separate and distinct beam splitting and beam combining regions formed thereon and being formed in one-piece formation, each said beam splitting region being coated with a first film coating for separating a respective primary color of light from incident light, each said beam combining region being coated with a second film coating for combining a respective primary color of light with a transmitted light ray; three light valves including a first light valve, a second light valve and a third light valve and used as image modulating devices, said three light valves respectively modulating and reflecting the three primary colors separated by said first and second dichroic beam splitters/combiners to let said first and second dichroic beam splitters/combiners collect the modulated and reflected first and second primary colors; and a projecting lens for collecting the three primary colors reflected and transmitted by said first and second dichroic beam splitters/combiners after modulation to project out a full-color image.