CRT Monitors

Short for cathode-ray tubes, CRT monitors were the only choice consumers had for monitor technology for many years. Cathode ray tube (CRT) technology has been in use for more than 100 years, and is found in most televisions and computer monitors. A CRT works by moving an electron beam back and forth across the back of the screen. Each time the beam makes a pass across the screen, it lights up phosphor dots on the inside of the glass tube, thereby illuminating the active portions of the screen. By drawing many such lines from the top to the bottom of the screen, it creates an entire screen of images.

The "Dots" are properly known as pixels (short for picture elements). Each pixel on colour monitor will contain three (sometimes 4) phosphors. One in each colour Red Green and Blue. Each phosphor is ecited separately and the colours are added together to give the overall colour.

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