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

    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

    Share

    COinS