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How does a TV get its picture?

Updated: 8/20/2019
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12y ago

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In old cathode ray tubes (CRT) An electron beam hits a phosphor coating, on the inside of the tube, causing it to glow. Electronic control of the beam, by altering position and strength of it, will make up a picture when scanned across the tube rapidly. The slow fading of the phosphor, (when the beam has gone), and the persistence of vision of our eyes, makes it look like a picture rather than a moving dot of light.

Modern LCD Tv's, open and close little shutters held in a liquid crystal. They are switched in sequence (the same pattern as a CRT above).

The shutters let light through from behind. The light is provided by small fluorescent tubes or white LEDs.

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