Method of and apparatus for sensing the location, such as coordinates, of designated points on an electrically sensitive touch-screen surface
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United States of America Patent
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Feb 21, 1989
Grant Date -
N/A
app pub date -
May 26, 1987
filing date -
May 26, 1987
priority date (Note) -
Expired
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Abstract
A method and apparatus are disclosed for determining the location of a designated point on an electrically sensitive touch-screen surface while minimizing aberrations introduced by non-uniformity in the field applied to the surface, by attaching a plurality of field-producing discrete point electrodes to widely spaced points on the surface in a predetermined geometric pattern and by measuring the currents drawn from the point electrodes upon the capacitive touching of a designated location on the surface.
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