Projection system for colour images e.g. video images - uses liq. crystal light shutter modulators

Abstract

Abstract The projection system (1) consists of a single light source (3) three colour optical modulator and a lens assembly (7). The white light is split by three dichroic mirrors into red, green and blue sub-beams (8R, 8G, 8B), each of which pass through liquid crystal light valve modulators (2) to a central assembly (6) of dichroic prisms. The resultant three colour beam (8) is focussed onto the screen (9) by the lens assembly. (d x delta n)/lambda for GREEN lies between the same expressions for RED and BLUE, where d is the thickness of the light valve delta n is the change in refractive index and lambda is the central wavelength of the sub-beam. @(8pp Dwg.No.1/4)@.

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