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Nixie tubes, LED display and VF display, top to bottom
Display board at Frankfurt (Main) Hauptbahnhof (2005)

A display device is an output device for presentation of information in visual[1] or tactile form (the latter used for example in tactile electronic displays for blind people).[2] When the input information that is supplied has an electrical signal the display is called an electronic display.

Common applications for electronic visual displays are television sets or computer monitors.

Types of electronic displays

Main article: Electronic visual display

In use

These are the technologies used to create the various displays in use today.

Segment displays

Digital clocks display changing numerals
The common segment displays shown side by side: 7-segment, 9-segment, 14-segment and 16-segment displays

Some displays can show only digits or alphanumeric characters. They are called segment displays, because they are composed of several segments that switch on and off to give appearance of desired glyph. The segments are usually single LEDs or liquid crystals. They are mostly used in digital watches and pocket calculators. Common types are seven-segment displays which are used for numerals only, and alphanumeric fourteen-segment displays and sixteen-segment displays which can display numerals and Roman alphabet letters.

Other types

Cathode-ray tubes were also formerly widely used.

Full-area 2-dimensional displays

2-dimensional displays that cover a full area (usually a rectangle) are also called video displays, since it is the main modality of presenting video.

Applications of full-area 2-dimensional displays

Full-area 2-dimensional displays are used in, for example:

Underlying technologies of full-area 2-dimensional displays

Underlying technologies for full-area 2-dimensional displays include:

The multiplexed display technique is used to drive most display devices.

Three-dimensional displays

Further information: Volumetric display

Mechanical types

See also

References

  1. ^ Lemley, Linda. "Chapter 6: Output". Discovering Computers. University of West Florida. Archived from the original on 14 June 2012. Retrieved 3 June 2012.
  2. ^ "Accommodations For Vision Disabilities". Energy.gov. Office of the Chief information Officer. Archived from the original on 9 June 2012. Retrieved 3 June 2012.