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A video wall is a special multi-monitor setup that consists of multiple computer monitors, video projectors, or television sets tiled together contiguously http://goo.gl/CnSCve

"1. Brief Introduction of Projectors What is the projector? Users and the projector stand on the same side. The person can see pictures appear on the screen or flat surface through the projector reflected by the light. Pros: Ultra big screen size, flexible picture size, lower costs, simple structure, easy access to achieve high resolutions, multiple media input. Cons: Caused by ambient brightness, its contrast is low, and uniformity is no good. 2. LED (Lighted Electronic Diode) screen What is an LED? It utilizes the unidirectional conductivity of the diode. The electronic circuit is used to control its color and grayscale to realize graphic and video display."