chapter  95

Light-Emitting Diode Displays

WithMohammad A. Karim

A light-emitting diode (LED) display manifests itself as a flat panel display that uses LEDs to display video. An LED is a particular solid-state p-n junction diode that gives out light upon the application of a bias voltage. The luminescence process in this case is electroluminescence, which is associated with emission wavelengths in the visible and infrared regions of the spectrum. When a forward bias is applied to the p-n junction diode, carriers are injected into the depletion region in large numbers. Because of their physical proximity, the electron–hole pairs undergo a recombination that is associated with the emission of energy. Depending on the semiconductor band-gap characteristics, this emitted energy can be in the form of heat (as phonons) or light (as photons).