Patent ID: 9582123
Date: 2017-02-28
CPC Classifications: G06F

Claim:
1. A system comprising: a sensor comprising a plurality of row electrodes and a plurality of column electrodes crossing the row electrodes, the sensor configured to detect a change in capacitance associated with a touch event upon a touch panel; a measuring component comprising a plurality of integrators each having a first input, a second input and an output, the first input being coupled to a corresponding one of the row electrodes, the measuring component configured to detect mutual-capacitance associated with the sensor during a first mode of operation and to detect self-capacitance associated with the sensor during a second mode of operation; a selection component comprising a first input, a second input coupled to a ground, a first output coupled to at least one of the column electrodes, and a second output coupled to the second input of at least one of the integrators, the selection component configured to receive a selection signal to cause selection of at least the first mode of operation or the second mode of operation; and a driver component coupled to the first input of the selection component, the driver component configured to generate a time-varying drive signal, the time-varying drive signal furnished to the sensor by way of the selection component, the time-varying drive signal having a first amplitude characteristic during the first mode of operation and a second amplitude characteristic different from the first amplitude characteristic during the second mode of operation, a magnitude of the difference between the first amplitude characteristic and the second amplitude characteristic being proportional to a difference between a change in mutual-capacitance associated with a touch event while in the first mode of operation and a change in self-capacitance associated with a touch event while in the second mode of operation.