LASERS FOR PROJECTION TELEVISION
According to the Scientific Information Agency FIAN-Inform, the RAS Institute of Physics named after P. Lebedev completed yet another stage of creation efficient lasers for projection television-powerful and concurrently miniature light sources, forming tricolor RGB (red-green-blue) pixels (elements of a digital image). The operating principle of such devices consists in a logical development of an electron-beam tube, where luminescent material is replaced by a semiconductor crystal. The idea of this innovative design also originated at the FIAN, in particular, it belongs to Acad. Nikolai Basov, to Oleg Bogdankevich, Dr. Sc. (Phys. & Math.) and Alexander Nasibov, Dr. Sc. (Tech.). As early as in 1967 they proposed to use a laser electron-beam tube to produce a record-breaking powerful light current (12,000 lm). In the 1980s, the Scientific Research Institute Platan (Fryazino, Moscow Region) in cooperation with the FIAN transformed this tube into the first laser display Kvantoskop, irradiating red, green and blue bands. The color "image" was formed in it by way of combining three monochrome HD images on the display with an area of around 100 m2. But the equipment was too big to handle and required cooling of a semiconductor layer to low temperatures (-120 °C). The task was to get a high capacity light at room temperature. Science in Russia, No.3, 2012 стр. 33 Laser electron-beam tube on monocrystals. "Today arc xenon high-pressure lamps are mainly used as sources of light in projection devices," said Vladimir Kozlovsky, Dr. Sc. (Phys. & Math.), head of research at the Cathode Beam Laser Laboratory to FIAN-Inform. "But their efficiency ratio is about 1 percent... The point is that to obtain a high quality image, we have to "cut" relatively narrow lines of three main colors--red, green and blue--from the complete spectrum of such a lamp, and the remaining capacity of radiation of the device, which converts into heat, ha ... Читать далее
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Estonia Online · 12 days ago 0 20
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Tallinn, Estonia
07.10.2021 (12 days ago)
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