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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.
DDC 1/2B
See DDC.
DDC 2Bi
See DDC.
Degaussing
The procedure of demagnetizing the shadow mask and associated metal parts of a picture tube
at switch-on to minimize picture distortion. This is usually accomplished by means of a special
degaussing coil through which a decaying alternating current is passed to generate an alternating
magnetic field that gradually decays to demagnetize the tube. Some monitors offer a manual