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[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 televisions or computer monitors.

History

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

Design

There are various designs for display devices, using various technologies. Several components are common to most display devices.

Components

  • Display, or screen, the portion of the device that displays changeable image
  • Bezel, the area surrounding portion that displays changing information
  • Housing, the enclosure of the display

Types

Electronic displays

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:

The common segment displays shown side by side: 7-segment, 9-segment, 14-segment and 16-segment displays.
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

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.
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