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 that is supplied has an electrical signal the display is called an electronic display.
Types of electronic displays
These are the technologies used to create the various displays in use today.
- Liquid crystal display (LCD)
- Light-emitting diode (LED) display
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.
Cathode-ray tubes were also formerly widely used.
Full-area 2-dimensional displays
Applications of full-area 2-dimensional displays
Full-area 2-dimensional displays are used in, for example:
- Television set
- Computer monitors
- Head-mounted displays, Heads-up displays 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:
- Cathode ray tube display (CRT)
- Light-emitting diode display (LED)
- Electroluminescent display (ELD)
- Electronic paper, E Ink
- Plasma display panel (PDP)
- Liquid crystal display (LCD)
- 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 nanotubes (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.
- Ticker tape (historical)
- Split-flap display (or simply flap display)
- Flip-disc display (or flip-dot display)
- Vane display
- 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.
- Comparison CRT, LCD, Plasma
- Graphical user interfaces
- History of display technology
- Human machine interface
- Input device
- Text display
- Lemley, Linda. "Chapter 6: Output". Discovering Computers. University of West Florida. Archived from the original on 14 June 2012. Retrieved 3 June 2012.
- "Accommodations For Vision Disabilities". Energy.gov. Office of the Chief information Officer. Archived from the original on 9 June 2012. Retrieved 3 June 2012.