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EL was first observed in 1907 by Captain Henry Joseph Round in silicon carbide (SiC), although ELD thechnology was not made commercially available until the 1980s.
Additional recommended knowledge
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.
ELDs are used as backlights in LCDs. They are also useful for creating soft ambient light, and for low-colour, high-contrast screens.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Electroluminescent_display". A list of authors is available in Wikipedia.|