Title

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

Authors

Authors

W. E. Glenn; C. E. Holton; G. J. Dixon;P. J. Bos

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

Abbreviated Journal Title

Smpte J.

Keywords

Engineering, Electrical & Electronic; Instruments & Instrumentation; Imaging Science & Photographic Technology; Telecommunications

Abstract

The optical efficiency of an active matrix liquid crystal display (AMLCD) light valve projector is determined by the optical design, the method of modulation, and the efficiency of the light source. This paper describes a new projector with an efficient modulation technique, which can employ unpolarized light by using a unique diffraction grating formed in a liquid crystal panel. The technique uses a Schlieren optical system and has been tested with xenon arcs, metal halide arcs, and efficient solid-state laser light sources. The optical system reduces laser speckle significantly when highly coherent baser sources are used All source combinations exceeded 3 lm/W for white light projection performance, and the experimental results of the combinations are discussed. This modulation technique obtains a high contrast ratio with smaller panels than can be achieved with rotation-of-polarization light valve projectors.

Journal Title

Smpte Journal

Volume

106

Issue/Number

4

Publication Date

1-1-1997

Document Type

Article; Proceedings Paper

Language

English

First Page

210

Last Page

216

WOS Identifier

WOS:A1997WQ98100003

ISSN

0036-1682

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