CRT

Braun tube (or cathode ray tube): a display component that transforms electrical signals into light signals.

A cathode ray tube (CRT) is a vacuum tube that contains an electron gun inserted into the cathode. The electron gun generates and emits cathode electrons (thermal electrons), which are attracted by strong positive electricity and scanned along the tube. During this process, a deflection yoke (DY) deflects electrons in every direction, making a two-dimensional display possible. Electrons hit the phosphor-coated surface of the screen, which radiates phosphors and displays images that contain text or graphics.