04680429 is referenced by 184 patents and cites 2 patents.

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 currents result and are utilized by a touch location circuit in determining the location of touch. The impedance touch current resulting from a user's touch may also be determined and used. The touch panel circuit automatically compensates for changes in impedance touch current, such as results when users touch the panel with ungloved and gloved fingers.

Title
Touch panel
Application Number
6/819949
Publication Number
4680429
Application Date
January 15, 1986
Publication Date
July 14, 1987
Inventor
Daniel G Teichmer
Portland
OR, US
Bruce Murdock
Beaverton
OR, US
Agent
David P Petersen
John D Winkelman
Assignee
Tektronix
OR, US
IPC
G08C 21/00
View Original Source