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Feasibility of light-valve projection for large screen high-definition television

: Mahler, G.

Frequenz 37 (1983), No.11-12, pp.300-6
ISSN: 0016-1136
ISSN: 2191-6349
Journal Article
Fraunhofer HHI ()
display instrumentation; optical images; optical modulation; optical projectors; schlieren systems; television reception; television systems; light-valve projection; large screen high-definition television; image quality; schlieren-optical process; deformation process; single-gun light valve; HDTV; large-screen displays; spatial carrier frequencies; multiplexing; primary colour components

The image quality achieved by light-valve projectors, e.g. their resolution limit, is mainly determined by the Schlieren-optical process, the deformation process of the control layer, and the deposition of definite charge patterns on the layer. The author gives an analysis describing those processes for the single-gun light valve. Evaluating the analysis, the application of this principle to HDTV large-screen displays appears to be limited due to several reasons which are essentially traced back to diffraction limitation and interference of the spatial carrier frequencies used for multiplexing the primary colour components. Improvements are proposed based on finer gratings on the control layer.