View source

A computer display,  monitor or screen is a [[computer peripheral]] device capable of showing still or moving images generated by a computer and processed by a [[graphics card]]. Monitors generally conform to one or more [[computer display standard|display standards]].

As with [[television]], several different [[hardware]] technologies exist for displaying the actual image :

* [[Cathode ray tube]] (CRT)
* [[Liquid crystal display]] (LCD)
* [[Plasma display]]
* [[Projector]]

A modern CRT display has considerable flexibility: it can often handle all [[resolution]]s from 640 by 480 [[pixel]]s (640x480) up to 1600 by 1200 pixels (1600x1200) with 32-bit colour and a variety of [[refresh rate]]s.

Some technical circles prefer the name "display" to the word "monitor" (perceived as ambiguous alongside the other senses of "monitor" meaning "machine-level debugger" or "thread synchronization mechanism").  Computer displays have also been known as '''visual display units''' or '''VDU'''s.

Early CRT-based VDUs without [[computer graphics|graphics]] capabilities gained the label 'glass [[teletype]]s', because of the similarity to their electromechanical predecessors.

[[Monochrome]] displays can only display one colour either as on or off. Grayscale displays can show only levels of a single colour. In both cases the display usually uses [[green screen|green]], orange (amber) or gray (white).

Colour monitors may show either digital colour (each of the red, green and blue signals may be either on or off, giving eight possible colours: black, white, red, green, blue, cyan, magenta and yellow) or analog colour (red, green and blue signals are continuously variable allowing the display of any combination). Digital monitors are sometimes known as TTL because the voltages on the red, green and blue inputs are compatible with [[Transistor-transistor logic | TTL]]  logic chips. 

Most modern [[computer]] displays can show thousands or millions of different colours in the [[RGB colour space]] by combining red, green, and blue dots in varying intensities.

Some display technologies (especially LCD) have an inherent misregistration of the colour planes, that is, the centers of the red, green, and blue dots do not line up perfectly.  In [[2001]], software designers began to exploit the misregistration to produce sharper images: [[Microsoft]]'s [[ClearType]]&trade; provides an example.

Moving texts can appear in italics, even when the display resolution is too low to show static italics: a fractional time delay causes an apparent corresponding shift of a fraction of a [[pixel]].

See also: [[gamut]], [[multisync]].


[[da:Sk%E6rm]]
[[de:Bildschirm]]
[[ja:&#12487;&#12451;&#12473;&#12503;&#12524;&#12452; (&#12467;&#12531;&#12500;&#12517;&#12540;&#12479;)]]
[[nl:Beeldscherm]]
[[pl:Monitor (ekran)]]
[[sv:Bildsk�rm]]

====References====
* Adapted from the [[Wikipedia]] article, "Computer display" http://en.wikipedia.org/wiki/Computer_display December 17, 2003