Display device

Display device
Nixie tubes, LED-display and VF display, top to bottom.

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

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

Contents

Segment displays

Digital clocks display changing numbers.

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:

  • Seven segment display (most common, digits only)
  • Fourteen segment display
  • Sixteen segment display
  • HD44780 Character LCD a widely accepted protocol for LCDs.

Full-area 2-dimensional displays

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

Applications

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

Underlying technologies

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

Three dimensional

  • Swept-volume display
  • Varifocal mirror display
  • Emissive volume display
  • Laser display
  • Holographic display

Mechanical types

  • Ticker tape (historical)
  • Split-flap display (or simply flap display)
  • Flip-disc display (or flip-dot display)
  • Rollsign
  • Tactile electronic displays (aka refreshable Braille display) 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.
  • Idiot lights, the "Check Engine" light on an automobile dashboard is the quintessential idiot light, giving only the information that something is amiss, but not what particular subsystem or component, nor how urgent the problem is. Neither does it give any information about issues that may be still within acceptable limits, but trending towards failure.

History

In the history of display technology, a variety of display devices and technologies have been used.

See also

External links


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Look at other dictionaries:

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  • NODD (Nexus Orthicon Display Device) — The first incarnation of the BBC1 globe. In use between 1969 and 1974 …   Wikipedia


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