Telegraphy – Systems – Position coordinate determination for writing
Patent
1986-08-26
1987-11-17
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
340706, G08C 2100
Patent
active
047078456
ABSTRACT:
A touch panel has panel scanning signals selectively applied to the four sides of a touch sensing surface of the panel so as to establish alternating current voltage gradients in desired directions across the touch sensing surface. When the panel is touched, touch signals result and are utilized by a touch location circuit in determining the location of touch. The impedence touch current resulting from a user's touch may also be determined and used. The touch panel circuit automatically compensates for any variations in touch signals which occur when the touch panel is untouched and automatically nulls the touch signals under such circumstances to enhance the accuracy of touch location determination.
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patent: 4488000 (1984-12-01), Glenn
Krein Philip T.
Meadows Robert D.
Murdock Bruce
Teichmer Daniel G.
Petersen David P.
Schreyer Stafford D.
Tektronix Inc.
Winkelman John D.
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