Difference between revisions of "Cathode ray tube"

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m (Jnc moved page CRT to Cathode Ray Tube: Full name)
m (Jnc moved page Cathode Ray Tube to Cathode ray tube over redirect: Generally not caps)
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Revision as of 18:53, 15 September 2018

A Cathode Ray Tube (usually CRT for short) is a now-obsolescent display technology that was the mainstay of visual output devices for a century, until displays consisting of arrays of LEDs, etc, became available economically.

It consists of a large vacuum tube, with a large face covered with a phospor, a phosphorescent powder. An electrode at the base of the neck (back) of the tube produces a beam of electrons, which are shot into the phosphor; where the beam hits, the phosphor produces a spot of light.

The beam can be scanned across the face by means of electrostatic or magnetic control grids through which the electron beam is sent.