Efficient liquid crystal light valves

William E. Glenn; Carvel E. Holton; George J. Dixon

doi:10.1117/12.205892

7 April 1995 Efficient liquid crystal light valves

William E. Glenn, Carvel E. Holton, George J. Dixon

Proceedings Volume 2407, Projection Displays; (1995) https://doi.org/10.1117/12.205892
Event: IS&T/SPIE's Symposium on Electronic Imaging: Science and Technology, 1995, San Jose, CA, United States

Abstract

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.

Citation Download Citation

William E. Glenn, Carvel E. Holton, and George J. Dixon "Efficient liquid crystal light valves", Proc. SPIE 2407, Projection Displays, (7 April 1995); https://doi.org/10.1117/12.205892

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