LED (Light-Emitting Diode)

A diode that produces light through electroluminescence (i.e. power applied to an emitting material). LEDs are now the most common light source employed as backlights in LCD TVs available today. Some makers have developed TVs based on direct view LEDs (rather than backlights) but these are usually very large (100″+) and very expensive, although the performance can be very good.