CRT display use lum signal to control the electron gun eradiating electrons, use two scan signals to control the electrons shooting the given dot of the screen, so that a picture forms.

• CRT显示器是利用亮度信号控制阴极射线管的电子枪发射电子，利用两路偏转信号控制阴极射线管的偏转电极产生偏转场使电子在偏转场的控制下击中荧光屏上特定的点而发光来形成图像的。