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LED(Light Emitting Diode)
Light Emitting Diode is a solid state PN junction device which emits light when forward biased.

Environmental friendly : Energy saving, one fifth of power consumption of incandescent lamps.

Long life : No filament short circuit as normally seen in the incandescent lamps(100,000 hr operating life times)

High speed response : Immediate response as usually seen in the semiconductors soon after the electric current is passed through.

Miniaturization : Smallest devices among optical devices due to spreads of chip LED.

Oversizing : Easy to assembly large-scale displays like outdoor electric bulletin boards by extending infinitely.

Durability : Excellent performance against temperature and impact due to packaging by epoxy.

Full color : Full color displays available after the popularization of blue LED.