Proceedings PaperOverview of technology for large wall screen projection using lasers as a light source
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A review of the components and technology used to produce large color raster Images using lasers as a light source is given, with an analysis of the tradeoffs that must be made. 1. Faithful color reproduction. Whereas the tristimulus model suggests that a wide range of three primary colors might be used, wavelength choices for the red and blue seem to be critical in this application. 2. Perceived versus measured brightness. It seems that the brightness of scanned laser light Images depends upon conventional perceptive variables such as contrast ratio, color purity, and luminosity: and not upon the special quality of the laser light itself, the scanning technique, or the coherence. Laser speckle can be considered strictly as a contrast ratio enhancement. Practical guidelines for planning installations are given, and the relationship between lumens and watts in laser projectors is clarified. 3. Laser choice. There are few laser light sources that meet both tristimulus and power requirements. While some pulsed lasers can be used, full color displays now require continuous wave lasers that have several lines in the visible part of the spectrum.