Importance

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Abstract

An electronic display unit according to this invention is formed of a plurality of display elements arranged in a two dimensional array. The display elements are selectively activated to generate a message. All the preselected display elements are activated and deactivated simultaneously. The message may be moved vertically or laterally across the array. A memory element is provided for activating each display element. Preferably the information from each memory element is simultaneously shifted laterally to an adjacent memory element while the display elements are disabled. A buffer is provided as an interface between each display element and the corresponding memory element. The intensity of each display element may be controlled by varying the power supply level to the buffer.

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First Claim