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A display device is an output device for presentation of

information Information is an Abstraction, abstract concept that refers to something which has the power Communication, to inform. At the most fundamental level, it pertains to the Interpretation (philosophy), interpretation (perhaps Interpretation (log ...

in visual or tactile form (the latter used for example in tactile electronic displays for blind people). 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 monitor A computer monitor is an output device that displays information in pictorial or textual form. A discrete monitor comprises a electronic visual display, visual display, support electronics, power supply, Housing (engineering), housing, electri ...

Types of electronic displays

In use

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

Liquid-crystal display A liquid-crystal display (LCD) is a flat-panel display or other Electro-optic modulator, electronically modulated optical device that uses the light-modulating properties of liquid crystals combined with polarizers to display information. Liq ...

(LCD) ** Light-emitting diode (LED) backlit LCD ** Thin-film transistor (TFT) LCD ** Quantum dot (QLED) display * Light-emitting diode (LED) display ** OLED display ** AMOLED display ** Super AMOLED display

Segment displays

Some displays can show only digits or

alphanumeric Alphanumericals or alphanumeric characters are any collection of number characters and letters in a certain language. Sometimes such characters may be mistaken one for the other. Merriam-Webster suggests that the term "alphanumeric" may often ...

characters. They are called segment displays, because they are composed of several segments that switch on and off to give appearance of desired

glyph A glyph ( ) is any kind of purposeful mark. In typography, a glyph is "the specific shape, design, or representation of a character". It is a particular graphical representation, in a particular typeface, of an element of written language. A ...

. 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

* Vacuum fluorescent display * Electroluminescent (ELD) display * Plasma (PDP) display * Laser-powered phosphor display

Cathode-ray tube A cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen. The images may represent electrical waveforms on an oscilloscope, a ...

s were also formerly widely used.

Full-area 2-dimensional displays

2-dimensional displays that cover a full area (usually a

rectangle In Euclidean geometry, Euclidean plane geometry, a rectangle is a Rectilinear polygon, rectilinear convex polygon or a quadrilateral with four right angles. It can also be defined as: an equiangular quadrilateral, since equiangular means that a ...

) are also called video displays, since it is the main modality of presenting

video Video is an Electronics, electronic medium for the recording, copying, playback, broadcasting, and display of moving picture, moving image, visual Media (communication), media. Video was first developed for mechanical television systems, whi ...

= Applications of full-area 2-dimensional displays

= Full-area 2-dimensional displays are used in, for example: * Television set *

Computer monitor A computer monitor is an output device that displays information in pictorial or textual form. A discrete monitor comprises a electronic visual display, visual display, support electronics, power supply, Housing (engineering), housing, electri ...

* Head-mounted displays,

Heads-up display A head-up display, or heads-up display, also known as a HUD () or head-up guidance system (HGS), is any see-through display, transparent display that presents data without requiring users to look away from their usual viewpoints. The origin of t ...

s and Virtual reality headsets * Broadcast reference monitor * Medical monitors * Mobile displays (for mobile devices) * Smartphone displays (for smartphones) * Video walls

= Underlying technologies of full-area 2-dimensional displays

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

display (CRT) * Light-emitting diode display (LED) *

Electroluminescent display Electroluminescent displays (ELDs) are a type of flat panel display created by sandwiching a layer of electroluminescent material such as gallium arsenide between two layers of conductors. When current flows, the layer of material emits radiatio ...

(ELD) *

Electronic paper Electronic paper or intelligent paper, is a display device that reflects ambient light, mimicking the appearance of ordinary ink on paper – unlike conventional flat-panel displays which need additional energy to emit their own light. This may ...

, E Ink * Plasma display panel (PDP) *

(LCD) ** High-performance addressing display (HPA) ** Thin-film transistor display (TFT) * Organic light-emitting diode display (OLED) * Digital Light Processing display (DLP) * Surface-conduction electron-emitter display (SED) (experimental) * Field-emission display (FED) (experimental) * Laser TV (forthcoming) *

Carbon nanotube A carbon nanotube (CNT) is a tube made of carbon with a diameter in the nanometre range ( nanoscale). They are one of the allotropes of carbon. Two broad classes of carbon nanotubes are recognized: * ''Single-walled carbon nanotubes'' (''S ...

s (experimental) * Quantum dot display (QLED) * Interferometric modulator display (IMOD) * Digital microshutter display (DMS) * microLED (in development) The multiplexed display technique is used to drive most display devices.

Three-dimensional displays

* Swept-volume display * Laser display * Holographic display * Light field displays * Andotrope

Mechanical types

* Ticker tape (historical) * Split-flap display (or simply flap display) * Flip-disc display (or flip-dot display) * Vane 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.

References

External links

Society for Information Display
- An international professional organization dedicated to the study of display technology
University of Waterloo Stratford Campus
- A university that offers students the opportunity to display their work on the school's 3-storey Christie MicroTile wall. {{Authority control Video hardware User interfaces