What is CRT ?

The primary output device in a graphical system is the video monitor. The main element of a video monitor is the Cathode Ray Tube (CRT), shown in the following illustration.

The operation of CRT is very simple −

  • The electron gun emits a beam of electrons (cathode rays).
  • The electron beam passes through focusing and deflection systems that direct it towards specified positions on the phosphor-coated screen.
  • When the beam hits the screen, the phosphor emits a small spot of light at each position contacted by the electron beam.
  • It redraws the picture by directing the electron beam back over the same screen points quickly.

Cathode Ray Tube

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