Display device


A display device is an output device for presentation of information in visual or tactile form. 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

In use

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

displays that cover a full area 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 for full-area 2-dimensional displays include:
The multiplexed display technique is used to drive most display devices.

Three-dimensional displays