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A CRT (Cathode Ray Tube) is, essentially, a big glass bottle which has had all the air removed. The front is then coated with a "phosphor" material which glows when struck by fast-moving electrons. In a colour screen, there's actually three phosphors - one which glows red, one which glows green, and one blue (hence: RGB, or Red Green Blue). Immediately behind the phosphor coating, there's a grid - like a fine mesh - to ensure the electrons only hit specific parts of the screen (the pixels) and don't just splash around the place. Finally, at the back (neck) of the "tube", there's an electron "gun" (three, for colour screens - one for each colour), which "fires" electrons towards the screen. Powerful electromagnets steer each beam towards the correct phosphor dots. The image on the screen is built up line by line; so each colour beam starts at the top left corner, and "scans" across, firing whenever a coloured dot is required. When the end of the line is reached, the beam jumps back to the left hand side, of the second line down; the process is repeated until all of the "scan lines" are complete; then the whole process starts again. And that, basically, is how a CRT works.

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15y ago
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13y ago

CRT means Cathode Ray Tube. A CRT monitor is one that looks like a "regular" tv set. You know, the ones that are like a big box. Newer ones are called LCD or Flat Panel

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Q: How does crt work?
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