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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. micro LED displays are LED displays with smaller LEDs, which poses significant development challenges.