传统“CRT”彩电的“会聚”(指红、绿、蓝三基色在屏幕上的重合)是由显像管的“自会聚”系统来完成的,“自会聚”显像管的R、G、B三个阴极在水平方向上按一字形排列,彼此的间距很小。这种结构,使中心电子束没有“会聚”误差,两个边束的“会聚”误差也小。由于一字形排列电子枪发出的三个电子束在一个水平面内,因而消除了产生垂直方向“会聚”误差的主要因素, The “convergence” (referring to the coincidence of the three primary colors of red, green and blue on the screen) of a traditional “CRT” color television is accomplished by a “self-convergence” system of picture tubes. Three of R, G and B The cathodes are arranged in a horizontal arrangement in a horizontal line with little spacing between them. This structure, so that the central electron beam “convergence” error, the two sides of the beam “convergence” error is small. Since the three electron beams emitted by the in-line electron gun are arranged in a horizontal plane, the main factor that causes the “convergence” error in the vertical direction is eliminated,