Full Color Projector With Single Liquid Crystal Light Valve

J. Koda; A. Henderson; A. Ledebuhr; W. Bleha; K. Huelsman

doi:10.1117/12.940114

20 April 1987 Full Color Projector With Single Liquid Crystal Light Valve

J. Koda, A. Henderson, A. Ledebuhr, W. Bleha, K. Huelsman

Proceedings Volume 0760, Large Screen Projection Displays; (1987) https://doi.org/10.1117/12.940114
Event: OE LASE'87 and EO Imaging Symposium, 1987, Los Angeles, CA, United States

Abstract

The projection system of the liquid crystal light valve (LCLV) coupled to Xenon arc source and high resolution CRT gives the advantage of high brightness and excellent resolution. The single light valve color projector concept lessens the cost at a slight sacrifice in resolution compared to a three light valve projector. The novel features and typical performance parameters for a new color graphics projector are: 1) use of miniature CRT's coupled to a single LCLV; 2) a color filter set to achieve color bands with minimum loss of light; 3) imaging and converging the color information by use of offset projection lenses; and 4) fine convergence of the information by digitally stored deflection correction signals. A prototype brassboard system was designed and constructed to evaluate the requirements for convergence, effect of the LCLV characteristics on uniformity of displayed hues, and the general performance parameters obtainable from a single LCLV color projector. Measurements to date shows modulated output of approx. 550 lumens (open gate of 800 lumens), limiting resolution for a primary color of 950 TVL, and contrast ratio of >50:1 for any of the colors. This paper describes the design and performance measurements in more detail.

Citation Download Citation

J. Koda, A. Henderson, A. Ledebuhr, W. Bleha, and K. Huelsman "Full Color Projector With Single Liquid Crystal Light Valve", Proc. SPIE 0760, Large Screen Projection Displays, (20 April 1987); https://doi.org/10.1117/12.940114

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