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Joined: Tue Feb 20 2007, 04:26PM
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The operation of CRTs and flat panel PDPs is completely different.
The CRT is a type of thermionic valve. Electrons are cooked off a thermionic cathode, and then organized into a very fine moving beam by means of electrostatic and electromagnetic forces. Very high vacuum is needed for this, since any residual gas in the tube would scatter the electron beam, or block it from reaching the screen altogether if there were too much gas in the beam path.
Historically, the electrons leaving the cathode were called "cathode rays" and the name cathode ray tube - CRT - has stayed with us, though for most purposes electrons are no longer considered to be 'rays.'
By contrast to the CRT, a PDP requires an ionisable gas in its cells.
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