Patent ID: 9164640
Filing Date: 2015-10-20
Classification: G06F

Abstract:
1. An apparatus comprising a capacitance-sensing circuit coupled to a capacitive-sense array comprising a plurality of electrodes, wherein the capacitance-sensing circuit comprises a plurality of sensing channels and is operative to: measure signals on a first subset of the plurality of electrodes using the plurality of sensing channels, wherein each of the plurality of sensing channels is coupled to one of the first subset of the plurality of electrodes; drive a first barrier electrode of the plurality of electrodes with an excitation signal while measuring the signals on the first subset, wherein the excitation signal is greater in magnitude than the measured signals, and wherein the first barrier electrode is adjacent to an edge electrode of the first subset of the plurality of electrodes coupled to one of the plurality of sensing channels; drive a second barrier electrode of the plurality of electrodes with the excitation signal while measuring the signals on the first subset, wherein the second barrier electrode is adjacent to another edge electrode of the first subset of the plurality of electrodes coupled to another one of the plurality of sensing channels; drive a second subset of the plurality of electrodes with a shield signal while measuring the signals on the first subset, wherein the excitation signal is greater in magnitude than the shield signal, wherein the plurality of electrodes of the capacitive-sense array comprises a plurality of row electrodes and a plurality of column electrodes, and wherein the first barrier electrode is a first column electrode of the plurality of column electrodes, the second barrier electrode is a second column electrode of the plurality of column electrodes, and the first subset includes column electrodes of the plurality of column electrodes, the column electrodes being between the first column electrode and the second column electrode.