CRT is the abbreviation of English Cathode Ray Tube, translated as cathode ray tube. As an imaging device, it is the earliest and most widely used display technology. This kind of projector can decompose the input signal source into R (red), G (green) and B (blue) on the phosphor screen of three CRT tubes. The phosphor is amplified, converged, and displayed on the large screen under high pressure. Color image. The optical system and the RT tube form a projection tube. The three-gun projector is usually a projector composed of three projection tubes. Because of the use of an internal light source, it is also called an active projection method. CRT technology is mature, the displayed image is rich in color, good in reproducibility, and has rich geometric distortion adjustment capabilities; but its important technical indicators image resolution and brightness are mutually restricted, which directly affects the brightness value of the CRT projector. So far, its brightness The value always hovered below 300lm. In addition, the CRT projector is complicated to operate, especially the convergence adjustment is cumbersome, and the body is large. It is only suitable for installation in relatively fixed places with weak ambient light, and is not suitable to be moved.
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