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LED display panels Perhaps the first recorded flat panel LED television screen developed was by J. P. Mitchell in 1977 . 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. The 1/4 inch thin flat panel prototype and the scientific paper were each displayed. 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, General Motors Corporation, and faculty from area Universities. 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.