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The question refers to video walls, as they are known. The wall consists of a grid of monitors such as 3 wide and 3 high up to as many as 5 or more wide and 5 or more high. The key to the system is the video processors that drive the monitors. The processor takes a single video signal and generates multiple output signals. Each output signal takes the picture information from only a portion of the incoming signal. Each output uses a different portion of the incoming signal so that the monitors will each display the correct part of the original signal. The processors are commercial or broadcast standard, built in very small numbers and therefore tend to be very expensive. One of the lower cost processors may have a price tag of $10,000 with better performing processors much more expensive. The advent of large plasma screens and high brightness projectors has virtually eliminated the market for video walls and there are now only a few specialists who manufacture this type of equipment.

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