Touch panel and method for controlling same

Details Touch panel and method for controlling same Touch panel and method for controlling same

1991-12-12

1993-01-12

Weldon, Ulysses

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

341 20, 250221, G09G 302

Patent

active

051793695

ABSTRACT:
The touch panel mof the present invention comprises a plurality of beam emitter-detector pairs disposed around the perimeter of a video display area. The emitters direct energy beams toward the detectors which are located directly opposite across the display area from the emitters. A programmed central processor is connected to the emitters and is programmed to serquentially scan the emitters for actuating the emitters one at a time to create a modulated energy beam which is intermittently turned on and off for predetermined periods of time at a predetermined frequency. The detectors sense the modulated energy beams and create an electrical signal which is fed through a comparator and then to the central processor so that the central processor can analyze and determine the location of any blockage which appears on the screen.

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ITW Entrex Brochure for Cyclops Touch Screen Device, at least Feb. 27, 1985 or earlier.

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