Electron gun
Updated: 11/13/2018 by Computer Hope
An electron gun is a component of CRT (Cathode Ray Tube) televisions and computer monitors. It fires a beam of electrons, activating individual phosphors (pixels) in the screen. The gun repeatedly fires and repositions the electron beam, creating a pattern of scan lines that produces a complete image on the screen. The picture shows an open Nokia monitor, and the outside of its electron gun.