Two-color liquid crystal light valve image projection system wit

Details Two-color liquid crystal light valve image projection system wit Two-color liquid crystal light valve image projection system wit

1981-12-28

1984-08-07

Corbin, John K.

Optics: image projectors

Plural projection paths with single light source

353 31, G02F 113

Patent

active

044640196

ABSTRACT:
This invention provides a unitary oil coupled optical arrangement for color selective prepolarization of the light incident upon two light valves. The optical arrangement is immersed within a single tank. It includes dichroic filters which act on polarized light from a light source which has been polarized into two beams by passing through and being reflected from a prepolarizing optical thin film stack. The first dichroic filter provides light of a first color and a first polarization while the second dichroic filter provides light of a second color and a second polarization. The light from each of the filters is then combined into a single beam by a thin film polarization-selective beam combiner prior to being applied to the main polarizing prism. The main prism then passes light of a first polarization and a first color to a first light valve and light of the second polarization and a second color to the second light valve in a conventional manner. Each light valve operates on the light in accordance with the presence of the writing light input from a cathode ray tube. The output of each light valve and is then applied to projection lens by the main polarizing prism.

REFERENCES:
patent: 4019807 (1977-04-01), Boswel et al.
patent: 4191456 (1980-03-01), Hong et al.
patent: 4345258 (1982-08-01), Tsai et al.
Hong et al., II, "Application of the Liquid Crystal Light Valve to a Large Screen Graphics Display", SID, May 8, 1979.

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