METHOD OF IMPROVED COMPUTATION OF TOUCH COORDINATES FOR FOUR-WIRE RESISTIVE TOUCH SCREENS
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United States of America Patent
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Issued Date -
Jul 1, 2010
app pub date -
Dec 29, 2009
filing date -
Dec 29, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method for calculating coordinates and touch pressure on a four-wire resistive touch screen includes applying a voltage gradient across a flexible resistive sheet in a touch screen and measuring the voltage where the screen comes in contact with another screen via analog to digital couplings to the other screen. The touch pressure is acquired by applying a higher voltage potential to one resistive sheet and a lower voltage potential to the other sheet so that current flows between the sheets at the point of contact between the sheets. A voltage on each sheet is then measured at the point of contact shared by the sheets. The measured voltages are used to calculate the touch pressure.
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