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LED display panels Perhaps the first recorded flat panel LED television screen developed was by J. P. Mitchell in 1977 [1]. The modular, scalable display array was initially enabled by hundreds of MV50 LEDs and a newly available TTL (transistor transistor logic) memory addressing circuit from National Semiconductor[2]. The 1/4 inch thin flat panel prototype and the scientific paper were each displayed.[3] at the 29th Engineering Exposition in Anaheim May 1978, organized by the Science Service in Washington D.C. The LED TV display received awards and recognition from NASA[4], General Motors Corporation[5], and faculty from area Universities[6]. The event was open to technology and business representatives from the U.S. and overseas. The monochromatic prototype remains operational. A LCD (liquid crystal display) matrix design was also cited as a future flat panel TV possibility in the accompanying scientific paper as a future alternate television display method using a similar array scanning design. Additionally, Mitchell presented his paper at the 90th Session of The Iowa Academy of Science April 21-22, 1978, at the University of Northern Iowa, Cedar Falls, Iowa In order to develop a color display, a triad of red, green and blue LEDs are needed. Efficient blue LEDs did not emerge until the early 1990s. High-brightness colors gradually emerged in the 1990s enabling new designs for outdoor signage and huge video displays for billboards and stadiums.