Telegraphy – Systems – Position coordinate determination for writing
Patent
1986-11-10
1988-02-16
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
G08C 2100
Patent
active
047256958
ABSTRACT:
In accordance with the invention, a touch panel includes an electrically conductive film of a first resistivity which extends over a first area of a base plate. Regions of a resistivity higher than the first resistivity, such as discontinuities in the film, are positioned in this first area. These discontinuities are located so as to enhance the uniformity of an electric field which is established in a touch sensing portion of the film.
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Panttaja, E., "Touch Screens Let Your Fingers Provide a Fast, Simple Entry into the Computer," Electronics, Apr. 19, 1984, pp. 140-144.
Krein Philip T.
Murdock Bruce
Teichmer Daniel G.
Petersen David P.
Schreyer Stafford D.
Tektronix Inc.
Winkelman John D.
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