Abstract: A large-scale high-visibility, color LED display sign intended for viewing from a long distance is described wherein power is managed by dividing the display sign into two or more distinct sections and providing power to each section from a respective separate power source. As a result, the amount of current drawn from any one source is reduced, thereby reducing require conductor sizes, circuit breaker trip limits, etc. Additionally, in applications where two or more power sources are available, this permits the distribution of the power load from the sign across the multiple sources without requiring bulky, complex and expensive power sharing apparatus. The sign's computer interface electronics are operated (scanned) directly by bus-connected interface circuitry. This eliminates the need for an external image buffer memory, since the computer's local memory acts as an image buffer. The computer serially transmits pixel data to the display via the interface mechanism.