Electroluminescent display

Electroluminescent display

Electroluminescence (EL) is an optical and electrical phenomenon where a material emits light in response to an electric current passed through it, or to a strong electric field. Electroluminescent Displays (ELDs) are a type of display created by sandwiching a layer of electroluminescent material such as GaAs between two layers of conductors. When current flows, the layer of material emits radiation in the form of visible light.

EL was first observed in 1907 by Captain Henry Joseph Round in silicon carbide (SiC), although ELD technology was not made commercially available until the 1980s.

Mechanism

EL works by exciting atoms by passing an electric current through them, causing them to emit photons. By varying the material being excited, the colour of the light emitted can be changed.The actual ELD is constructed using flat, opaque electrode strips running parallel to each other, covered by a layer of electroluminescent material, followed by another layer of electrodes, running perpendicular to the bottom layer. This top layer must be transparent in order to let light escape. At each intersection, the material lights, creating a pixel.

Application

ELDs are used as backlights in LCDs. They are also useful for creating soft ambient light, and for low-colour, high-contrast screens.

Abbreviations

* AMEL Active Matrix Electroluminescence
* TFEL Thin Film Electroluminescence
* TDEL Thick Dielectric Electroluminescence

ee also

Electroluminescence

*Electroluminescence

Displays

*Liquid Crystal Display
*Cathode Ray Tube
*Field Emission Display

Lighting

*Lighting
*Luminescence
*Light emitting capacitor
*Electroluminescent wire

External links

* [http://www.indiana.edu/~hightech/fpd/papers/ELDs.html A site on ELDs]


Wikimedia Foundation. 2010.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • Electroluminescent Display —   [engl.], Elektrolumineszenz Bildschirm …   Universal-Lexikon

  • electroluminescent display — elektroliuminescencinis vaizduoklis statusas T sritis radioelektronika atitikmenys: angl. electroluminescent display vok. Elektrolumineszenzanzeiger, m; Elektrolumineszenzsichtgerät, n rus. электролюминесцентное устройство отображения, n pranc.… …   Radioelektronikos terminų žodynas

  • organic electroluminescent display — noun A display using organic electroluminescent materials such as organic light emitting diodes. Syn: organic light emitting diode display, OLED display …   Wiktionary

  • 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 or tactile form (the latter used for example in tactile electronic displays for blind people). When the input… …   Wikipedia

  • Display contrast — Contrast in visual perception is the difference in appearance of two or more parts of a field seen simultaneously or successively (hence: brightness contrast, lightness contrast, color contrast, simultaneous contrast, successive contrast, etc.).… …   Wikipedia

  • Quantum dot display — A quantum dot display is a type of display technology used in flat panel displays as an electronic visual display. Quantum dots (QD) or semiconductor nanocrystals are a form of light emitting technology and consist of nano scale crystals that can …   Wikipedia

  • History of display technology — Over the years, a variety of display devices and technologies have been used in order to display electronic data in a way that s legible to humans. Contents 1 Early history 2 Cathode ray tube 2.1 Monochrome CRT 2.2 …   Wikipedia

  • Flat panel display — Flat Panel TVs have existed since 1964, and are much thinner and lighter than traditional televisions. Flat panel displays (sometimes called flatscreen, although, strictly speaking, flatscreen is used to describe CRT screens that have a… …   Wikipedia

  • Next generation of display technology — is a term used to describe any display technology that could outperform LCD and Plasma technologies in the future. List of next generation display technologies Display technology Companies involved Status Organic light emitting diode (OLED) Sony …   Wikipedia

  • Liquid crystal display — LCD redirects here. For other uses, see LCD (disambiguation). Reflective twisted nematic liquid crystal display. Polarizing filter film with a vertical axis to polarize light as it enters. Glass substrate with ITO electrodes. The shapes of these… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”