Cathode-ray tube - the general term for all tubes in which one or more electron beams emitted by a
cathode are periodically scanned across a phosphor screen by means of deflection circuitry. A
special form of the cathode-ray tube is the TV and monitor picture tube.
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D
DDC (Display Data Channel)
DDC is a communication channel for displays and computers. The DDC feature allows the monitor
controller to be automatically configured to make optimal use of the display without manual user
interaction. DDC is implemented as part of the new Plug & Play approach introduced into the PC
market to increase user friendliness.
The three levels developed for Plug & play are: (1) DDC1, monitor send data to the PC; (2) DDC2B,
PC can request information from monitor; and (3) DDC2Bi which is a two-way communication -
monitor can be addressed and PC or graphics board can give commands to monitor.
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