• Directory of Internet terms
  • Cathode ray tube (crt) — An older type of computer Display Screen or Monitor, in which beams of high-voltage electrons are fired at a screen causing thousands of Red, Green and Blue (RGB) dots to glow in different combinations and intensities, thus producing the full-colour image displayed on the screen. Cathode Ray Tubes are also used in older domestic TV sets. Newer types of display screens are of the LCD or TFT flat panel type - like many modern TV sets. They are much lighter, use less electricity and take up less room on your desk. See Section 1.1.2, Module 1.2 for further information and illustrations of different types of display screens.