Light valve projection system with non imaging optics for illumination
First Claim
1. A display system of the type comprising an illumination subsystem including a light source, said subsystem being disposed within a spatial coordinate system having orthogonal X, Y, and Z axes, and comprising a first non-imaging reflector having a rectangular output aperture disposed centrally about said Z axis, said light source being positioned inside said reflector along said Z axis for illuminating said output aperture, said non-imaging reflector having sidewalls extending from said light source in the direction of said Z-axis, said sidewalls having a profile which is a regularly curved contour along at least a portion of the distance between said light source and said output aperture to provide light rays having a low angle of deviation exiting from said output aperture, a first substantially rectangular modulating device in the path of light emitted by said illumination subsystem, said reflector cooperating with said light source to illuminate said modulating device substantially uniformly in a rectangular pattern;
- and a projection lens for projecting the substantially rectangular image of said modulating device to form at least a portion of a display.
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Accused Products
Abstract
Display system includes an illumination system which utilizes a light collector in the form of a non-imaging reflector having a rectangular output aperture, a modulating device in the path of light emitted by the illumination system, and a projection lens. Three such collectors having spectrally tuned lamps therein and using rectangular LCD'"'"'s as modulating devices can be used in a television projection system.
53 Citations
22 Claims
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1. A display system of the type comprising an illumination subsystem including a light source, said subsystem being disposed within a spatial coordinate system having orthogonal X, Y, and Z axes, and comprising a first non-imaging reflector having a rectangular output aperture disposed centrally about said Z axis, said light source being positioned inside said reflector along said Z axis for illuminating said output aperture, said non-imaging reflector having sidewalls extending from said light source in the direction of said Z-axis, said sidewalls having a profile which is a regularly curved contour along at least a portion of the distance between said light source and said output aperture to provide light rays having a low angle of deviation exiting from said output aperture, a first substantially rectangular modulating device in the path of light emitted by said illumination subsystem, said reflector cooperating with said light source to illuminate said modulating device substantially uniformly in a rectangular pattern;
- and a projection lens for projecting the substantially rectangular image of said modulating device to form at least a portion of a display.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
- 18. An illumination system disposed within a spatial coordinate system having orthogonal X, Y and Z axes and being of the type comprising a light source and a collector having an output aperture, characterized in that said collector is a non-imaging reflector having a rectangular output aperture disposed along a central Z-axis, said light source being substantially cylindrical and centered in the XY plane, said light source having an arc with a length along the Y-axis and a radius along the X-axis, said source further comprising a cylindrical envelope concentric to said arc and being positioned inside said reflector along said central axis for illuminating said output aperture, said non-imaging reflector having sidewalls extending from said light source in the direction of said Z-axis, said sidewalls having a profile which is a regularly curved contour along at least a portion of the distance between said light source and said output aperture to provide light rays having a low angle of deviation exiting from said output aperture, said non-imaging reflector cooperating with said light source to illuminate said output aperture substantially uniformly in a substantially rectangular pattern.
Specification