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in 1977 by Bent Stumpe, a Danish electronics engineer, for the control room of CERN’s accelerator SPS (Super Proton Synchrotron).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.Touchscreens had the bad reputation of being imprecise until 1988.Most user-interface books would state that touchscreen selections were limited to targets larger than the average finger.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.It was used primarily with a drawing software application.
It consisted of a plastic pen and a plastic board with a transparent window where pen presses are detected.
A touchscreen is an input and output device normally layered on the top of an electronic visual display of an information processing system.
A user can give input or control the information processing system through simple or multi-touch gestures by touching the screen with a special stylus or one or more fingers.
HP mounted their infrared transmitters and receivers around the bezel of a 9-inch Sony cathode ray tube (CRT).
In 1984, Fujitsu released a touch pad for the Micro 16 to accommodate the complexity of kanji characters, which were stored as tiled graphics.