Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1996-04-17
1998-05-05
Epps, Georgia Y.
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
362268, 362 32, 359 48, 359485, G02B 2714, G02B 530, G02F 11335, F21V 704
Patent
active
057483760
ABSTRACT:
A liquid-crystal projection display system with higher efficiency is provided. The liquid-crystal projection display system comprises a double-layer square-pillar-like integrator, including an inner layer and an outer layer, having a polarization-separating thin film formed between the inner layer and the outer layer. The system also includes a converging light source for generating light converged at a point near one end surface of the double-layer square-pillar-like integrator, so that most light emitted from the light source enters the double-layer square-pillar-like integrator, and different polarized light is transmitted by being totally reflected off of surfaces of the inner layer and the outer layer respectively. A first lens is provided for forming real light spots on an image plane from virtual light spots formed by totally reflecting the different polarized light transmitted in the double-layer square-pillar-like integrator. A polarization rotator is located at the image plane, for rotating one of the polarizations of the real light spots, while keeping another one of the polarizations unchanged, so that the polarization angles of all the real light spots are identical. A second lens is provided for evenly converging and projecting light beams from the light spots with an identical linear polarization to overlay on an object.
REFERENCES:
patent: 4918583 (1990-04-01), Kudo et al.
Chang Chong-Min
Chen Kuang-Vu
Chen San-Ming
Lin Kun-Wei
Shieh Han-Ping D.
Cornely John P.
Epps Georgia Y.
Industrial Technology Research Institute
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