METHOD FOR CONTROLLING A TOUCH SENSOR
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United States of America Patent
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Issued Date -
Jan 1, 2015
app pub date -
Mar 15, 2012
filing date -
Mar 15, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention relates to a method for controlling a touch sensor. The touch sensor comprises a support layer and an electrically conductive sensor structure thereon. The electrically conductive sensor structure forms a plurality of capacitors having a capacitance varying in response to a user touching or approaching the capacitor. The electrically conductive sensor structure comprises a piezoresistive material providing a resistance varying in response to a force being applied to the support layer. According to the method, an alternating electrical signal is supplied to the electrically conductive sensor structure for scanning the capacitors. An actuation position where the user touches the touch sensor is determined based on the alternating electrical signal and the capacitances of the capacitors. An electrical signal which is a function of the resistance of the electrically conductive sensor structure is detected and synchronously demodulated based on the alternating electrical signal.
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