Display device

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Nixie tubes, LED display and VF display, top to bottom

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.

Cathode ray tubes were also formerly widely used.

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. There are several types:

HD44780 LCD controller is a widely accepted protocol for LCDs.

Underlying technologies of segment displays[]

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[]

  • Ticker tape (historical)
  • Split-flap display (or simply flap display)
  • Flip-disc display (or flip-dot display)
  • Rollsign
  • Tactile electronic displays are usually intended for the blind. They use electro-mechanical parts to dynamically update a tactile image (usually of text) so that the image may be felt by the fingers.
    • Optacon, using metal rods instead of light in order to convey images to blind people by tactile sensation.

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.

External links[]

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