Touch panel coordinate determination
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United States of America Patent
Stats
-
Nov 11, 2003
Grant Date -
Aug 1, 2002
app pub date -
Jan 31, 2001
filing date -
Jan 31, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Method and system for determining (x,y) location coordinates for a contact point on a touch sensitive panel or input screen. Selected, substantially constant voltages are provided for two electrodes that are part of the input screen, from one voltage source. A current value is measured for one resistive line segment that extends from the contact point to one of the electrodes, and the voltage at the contact point is measured. Resistance values for at least two of the four resistive lines that extend from the contact point to the electrodes are calculated or estimated, and (x,y) location coordinates are estimated for the contact point from these resistance values. The invention uses two measurements and two non-switched voltage sources to provide the (x,y) coordinates.
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