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US 6,478,429 B1Granted
Reflective projector
AssigneeFujitsu Limited
InventorsHirokazu Aritake, Tsuyoshi Matsumoto, Shin Eguchi, Fumio Yamagishi
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Abstract
A reflective projector includes a light source, reflective liquid crystal panels, a dichroic prism for separating a light beam from the light source into light beams of predetermined colors by using interference and for synthesizing the light beams of predetermined colors into a light beam, and a projection lens. The reflective projector further includes a first polarizer provided between the light source and the reflective liquid crystal panels and a second polarizer provided between the reflective liquid crystal panels and the projection lens.
Claims33
A reflective projector comprising:
- an illumination system for generating an illumination light beam with predetermined wavelengths;
- a plurality of reflective display elements for generating image light beams by reflecting said illumination light beam emitted from said illumination system;
- a polarization controlling element for changing polarization of a predetermined wavelength of light emitted from said illumination system;
- a color separation/synthesis unit for separating said illumination light beam into light beams of predetermined colors and for synthesizing said image light beams from said reflective display elements;
- a projection lens for projecting said synthesized image light beams;
- wherein said reflective projector is formed such that said illumination light beam impinges on a light entering/exiting surface which is one of a plurality of surfaces of said color separation/synthesis unit and said image light beam exits from said light entering/exiting surface toward said projection lens;
- and
- wherein said illumination light beam and said image light beam are separated by controlling an entry angle of said illumination light beam or an exiting angle of said image light beam with respect to said color separation/synthesis unit, or by controlling an entry angle of said illumination light beam or an exiting angle of said image light beam with respect to each of said reflective display elements.
5 more elements
Dependencies are inferred from the claim text.