Light Emitting Diode

 

A light-emitting-diode (LED) (pronounced /??Li??Di?/),[1] is a semiconductor diode that emits light when an electric current is applied in the forward direction of the device, as in the simple LED circuit. The effect is a form of electroluminescence where incoherent and narrow-spectrum light is emitted from the p-n junction.

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A semiconductor light source that emits visible light or invisible infrared radiation.

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Work on a completely different concept. Traditionally leds are created from two semiconductors. By running current in one direction across the semiconductor the led emits light of a particular frequency (hence a particular color) depending on the physical characteristics of the semiconductor used. The semiconductor is covered with a piece of plastic that focuses the light and increases the brightness. These semiconductors are very durable, there is no filament, they dont require much power, theyre brighter and they last a long time. By densely packing red, blue and green leds next to each other on a substrate one can create a display

Source

Work on a completely different concept. Traditionally leds are created from two semiconductors. By running current in one direction across the semiconductor the led emits light of a particular frequency (hence a particular color) depending on the physical characteristics of the semiconductor used. The semiconductor is covered with a piece of plastic that focuses the light and increases the brightness. These semiconductors are very durable, there is no filament, they dont require much power, theyre brighter and they last a long time. By densely packing red, blue and green leds next to each other on a substrate one can create a display. The disadvantage of leds is that they are much larger therefore the resolution is not nearly as good as lcd displays. That's why most led displays are large, outdoor displays, not smaller devices, like monitors.

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