The smallest unit of a graphic is a pixel. The smaller the pixels, the higher the graphics resolution. In the CRT tube, the smallest pixel is determined by the focusing performance. The so-called addressable resolution refers to the number of smallest pixels. The projector focusing mechanism of CRT tube includes electrostatic focusing, magnetic focusing and electromagnetic composite focusing. Among them, electromagnetic composite focusing is more advanced. Its advantage is good focusing performance, especially under high brightness conditions, it will be defocused and the focusing accuracy is high. It can focus on sub-regions, edges, and four corners, so that every point on the screen is very clear.
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