Flat Panel LED Television Display
Possibly the first true all LED flat panel television TV screen was developed, demonstrated and documented by J. P. Mitchell in 1977. The modular, scalable display was initially designed with hundreds of MV50 LEDs and a newly available TTL memory addressing circuit from National Semiconductor. The ¼ in thin flat panel prototype and the scientific paper were displayed at the 29th ISEF expo sponsored by the Society for Science and the Public in Washington D.C. May 1978. The technical display received awards and recognition. Awards included NASA, General Motors Corporation,and recognition from faculty and area Universities and the IEEE. The monochromatic LED prototype remains operational. An LCD (liquid crystal display) matrix design was also cited in the LED paper as an alternative x-y scan technology and as a future alternate television display method. The replacement of the 70 year+ high-voltage analog system (cathode-ray tube technology) with a digital x-y scan system has been significant. Displacement of the electromagnetic scan systems included the removal of inductive deflection, electron beam and color convergence circuits. The digital x-y scan system has helped the modern television to “collapse” into its current thin form factor.
In 1978, Mitchell also submitted his paper to the Westinghouse Science Talent Search contest, where he received an Honorable Mention.
Mitchell also 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.
The 1977 model was monochromatic by design. Efficient blue LEDs did not arrive for another decade. Large displays now use high-brightness diodes to generate a wide spectrum color palette. It took three decades and organic electroluminescent materials for Sony to introduce an LED TV: the Sony XEL-1 OLED screen which was marketed in 2009.
The Largest LED Television Display2011 UEFA Champions League final match between Manchester United and Barcelona was broadcasted live in 3D format in Gothenburg (Sweden). The football match was broadcasted on EKTA screen. And EKTA’s Ukrainian produced 3D Led TV makes The Guinness Book of World Records.[9][10] The live 3D broadcast was provided by the Swedish company Viasat.
LED text displays
LED text displays refer to types that are specialized and limited to display of alpha-numeric characters. Most types display either one character or a group of characters. One character is generally displayed by a matrix of LED's, or by a matrix of segments.
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