Display device

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. Common applications for electronic visual displays are television sets or computer monitors. Electronic visual display These are the technologies used to create the various displays in use today. Liquid crystal display (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 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. Vacuum fluorescent display Electroluminescent (ELD) display Plasma (PDP) display Laser-powered phosphor display Cathode-ray tubes were also formerly widely used. 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.