High Efficiency Light-Valve Projectors And High Efficiency Laser Light Sources

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 an efficient modulation technique. It employs 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 for white light Experimental results of the combinations will be given. This modulation technique obtains a high contrast ratio with smaller panels than can be achieved with rotation-of-polarization light valve projectors.

Publication Date

9-14-2015

Publication Title

Proceedings 137th SMPTE Technical Conference and World Media Expo

Number of Pages

446-458

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.5594/M00513

Socpus ID

84978384000 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84978384000

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