Efficient optical system for a high resolution projection display employing reflection light valves
First Claim
Patent Images
1. An apparatus for projecting an image comprising:
- a color splitting prism assembly having a plurality of output-input faces;
a reflective spatial light modulator at each of said output-input faces, each of said spatial light modulators having a reflective surface defining a geometrical shape;
a light tunnel positioned within a first light path between a light source and said color splitting prism assembly, said light tunnel having a cross-sectional shape corresponding to said geometrical shape;
a color filter positioned between each of said reflective surfaces and said output-input faces;
a polarizing beam splitter positioned within said first light path;
a projection lens positioned in a second light path between said polarizing beam splitter and a screen;
means for suppressing stray light reflected from said screen back into said projection lens; and
means for suppressing ambient light from illuminating said screen.
3 Assignments
0 Petitions
Accused Products
Abstract
An optical system is described consisting of reflection birefringent light valves, polarizing beam splitter, color image combining prisms, illumination system having a light tunnel, projection lens, filters for color and contrast control, and screen placed in a configuration offering advantages for a high resolution color display.
99 Citations
16 Claims
-
1. An apparatus for projecting an image comprising:
-
a color splitting prism assembly having a plurality of output-input faces; a reflective spatial light modulator at each of said output-input faces, each of said spatial light modulators having a reflective surface defining a geometrical shape; a light tunnel positioned within a first light path between a light source and said color splitting prism assembly, said light tunnel having a cross-sectional shape corresponding to said geometrical shape; a color filter positioned between each of said reflective surfaces and said output-input faces; a polarizing beam splitter positioned within said first light path; a projection lens positioned in a second light path between said polarizing beam splitter and a screen; means for suppressing stray light reflected from said screen back into said projection lens; and means for suppressing ambient light from illuminating said screen. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
Specification