Video walls are multiple displays that are combined to form a single large screen. They comprise LCD panels, LED arrays, DLP tiles, and rear projection displays. Video walls are used in a wide array of applications in hotels, airports, control rooms, and public places. Video walls deliver clear and detailed pictures that instantly attract the attention of viewers, which makes it a highly effective instrument for the purpose of advertising and promotions. The high-end video quality offered by the video walls makes it useful in monitoring of crowds, air traffic control, and defense.