A LED display is a flat panel display that uses an array of light-emitting diodes as pixels for a video display. Their brightness allows them to be used outdoors where they are visible in the sun for store signs and billboards. In recent years, they have also become commonly used in destination signs on public transport vehicles, as well as variable-message signs on highways.
LED displays are capable of providing general illumination in addition to visual display, as when used for stage lighting or other decorative as opposed to informational purposes.
LED displays can offer higher contrast ratios than a projector and are thus an alternative to traditional projection screens, and they can be used for large, uninterrupted without a visible grid arising from the bezels of individual displays video walls.
A light-emitting diode is a two-lead semiconductor light source.A material called electro-luminance is used to convert electrical energy into light energy which later helps in the propagation of light energy. When light is emitted in the front bias, it is called a light-emitting diode.microLED displays are LED displays with smaller LEDs, which poses significant development challenges./wikipedia