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US 7,458,691 B2Granted
Holographic combiners for illumination of spatial light modulators in projection systems
AssigneeTexas Instruments Incorporated
InventorWalter M. Duncan
Life of this patent
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Abstract
Described is an optical device for combining multiple light sources in an optical projection system. One embodiment of the optical device includes at least two light sources having first and second wavelengths, and an optical element for substantially diffracting the first and second wavelengths of the two light sources and combining them into a single beam of light.
Claims15
A method of manufacturing an optical device for an optical projection system, the method comprising:
- providing a first light source emitting light of a first wavelength along a first path;
- providing a second light source emitting light of a second wavelength along a second path;
- substantially diffracting the first and second wavelengths of the two light sources and combining them into a single beam of light with an optical element;
- modulating the single beam of light by a spatial light modulator;
- and
- focusing the modulated beam of light onto an image plane.
3 more elements
An optical projection system, comprising:
- an optical device comprising:
- a first light source emitting light of a first wavelength along a first path;
- a second light source emitting light of a second wavelength along a second path;
- and
- an optical element for substantially diffracting the first and second wavelengths of the two light sources and combining them into a single beam of light;
- at least one modulator for receiving and modulating the single beam of light;
- and
- at least one projection lens for focusing the modulated beam of light onto an image plane.
5 more elements
Dependencies are inferred from the claim text.