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7 April 1995 Efficient liquid crystal light valves
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The optical efficiency of a liquid-crystal light-valve projector is determined by the optical design, the method of modulation and the efficiency of the light source. A projector has been built with efficient optics. This projector has been tested with polarized and unpolarized light using rotation of polarization as a modulation technique and also with unpolarized light by using a diffraction grating formed in the liquid crystal. The diffraction technique uses a Schlieren optical system. The light sources tested have been xenon arcs, metal halide arcs and efficient solid-state lasers. The optical system reduces laser speckle significantly when laser sources are used. All combinations exceeded 3 lumens per watt when compared on a white light basis. Experimental results of the combinations will be given. Heating of the panel by absorption of visible light limits the minimum panel size that can be used for a given light output. Typical values will be presented for the choice of panel size for a given light output.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
William E. Glenn, Carvel E. Holton, and George J. Dixon "Efficient liquid crystal light valves", Proc. SPIE 2407, Projection Displays, (7 April 1995);


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