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Adisplay device is anoutput device for presentation ofinformation invisual[1] ortactile form (the latter used for example intactile electronic displays for blind people).[2] When the input information that is supplied has an electrical signal the display is called anelectronic display.
Common applications forelectronic visual displays aretelevision sets orcomputer monitors.
These are the technologies used to create the various displays in use today.
Some displays can show onlydigits oralphanumeric characters. They are calledsegment displays, because they are composed of several segments that switch on and off to give appearance of desiredglyph. The segments are usually singleLEDs orliquid crystals. They are mostly used indigital watches andpocket calculators. Common types areseven-segment displays which are used for numerals only, and alphanumericfourteen-segment displays andsixteen-segment displays which can display numerals and Roman alphabet letters.
Cathode-ray tubes were also formerly widely used.
2-dimensional displays that cover a full area (usually arectangle) are also calledvideo displays, since it is the main modality of presentingvideo.
Full-area 2-dimensional displays are used in, for example:
Underlying technologies for full-area 2-dimensional displays include:
Themultiplexed display technique is used to drive most display devices.
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