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26-Oct-2017 23:38

It was used primarily with a drawing software application.Touch-sensitive control-display units (CDUs) were evaluated for commercial aircraft flight decks in the early 1980s.These touchscreens had a crossed array of 16×16 infrared position sensors, each composed of an LED on one edge of the screen and a matched phototransistor on the other edge, all mounted in front of a monochrome plasma display panel.This arrangement could sense any fingertip-sized opaque object in close proximity to the screen.A similar touchscreen was used on the HP-150 starting in 1983.

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This was a further development of the self-capacitance screen (right), also developed by Stumpe at CERN Frank Beck and Bent Stumpe, engineers from CERN (European Organization for Nuclear Research), developed a transparent touchscreen in the early 1970s, based on Stumpe's work at a television factory in the early 1960s.Some touchscreens use ordinary or specially coated gloves to work while others may only work using a special stylus or pen.