computer display monitor, usually called simply a monitor, is a piece of
electrical equipment which displays viewable images generated by a computer without
producing a permanent record. The word "monitor" is used in other contexts; in
particular in television broadcasting, where a
television picture is displayed to a high
standard. A computer display device is usually either a cathode ray tube or some form of
flat panel such as a TFT LCD. The monitor comprises the display device, circuitry
to generate a picture from electronic signals sent by the computer, and an enclosure or case.
Within the computer, either as an integral part or a plugged-in interface, there is circuitry
to convert internal data to a format compatible with a monitor.
The inch size quoted is the diagonal size of the picture tube or LCD panel. With CRTs the picture
is normally smaller by 1.5" - 2", hence a 17" LCD gives about the same size picture as a 19" CRT.
This method of size measurement dates from the early days of CRT television when round picture
tubes were in common use, which only had one dimension that described display size. When
rectangular tubes were used, the diagonal measurement of these was equivalent to the round tube's
diameter, hence this was used (and of course it was the largest of the available numbers)
A widescreen display always has less screen area for a given quoted inch size than a
standard 4:3 display, due to basic geometry.
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