BARRIER ELECTRODE DRIVEN BY AN EXCITATION SIGNAL
First Claim
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, andwherein 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.
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Accused Products
Abstract
Apparatuses and methods of driving barrier electrodes of a capacitive-sense array with an excitation signal are described. One apparatus includes a capacitance-sensing circuit coupled to a capacitive-sense array including multiple electrodes. The capacitance-sensing circuit includes multiple sensing channels. The capacitance-sensing circuit is operative to measure signals on a first subset of the multiple electrodes using the multiple sensing channels. Each of the sensing channels is selectively coupled to one of the first subset of electrodes. The capacitance-sensing circuit is further operative to drive a barrier electrode of the multiple electrodes with an excitation signal while measuring the signals on the first subset. The excitation signal is greater in magnitude than the measured signals. The barrier electrode is adjacent to an edge electrode of the first subset that is coupled to one of the sensing channels. A second subset of electrodes can be driven by a shield signal and the excitation signal is greater in magnitude than the shield signal.
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Citations
22 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 11)
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7. (canceled)
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8. (canceled)
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9. (canceled)
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10. (canceled)
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12. A method comprising:
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coupling a plurality of receive channels of a capacitance-sensing circuit to a first subset of a plurality of electrodes of a capacitive-sense array; measuring signals on the first subset by the capacitance-sensing circuit; driving a 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 signals measured on the first subset, wherein the barrier electrode is adjacent to an edge electrode of the first subset of the plurality of electrodes coupled to one of the plurality of receive channels; driving a second subset of the plurality of electrodes with a shield signal while measuring the signals on the first subset, wherein the execution signal is greater in magnitude than the shield signal; driving a transmit signal on a first electrode of a second subset of the plurality of electrodes; and measuring a receive signal on a second electrode of the first subset of the plurality of electrodes using one of the plurality of sensing channels, wherein the receive signal is representative of a mutual capacitance between the first electrode and the second electrode. - View Dependent Claims (13)
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14. (canceled)
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15. (canceled)
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16. An apparatus comprising:
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a capacitive-sense array of a plurality of electrodes; and a processing device coupled to the capacitive-sense array, wherein the processing device is configured to; selectively couple sensing channels of a capacitance-sensing circuit to a first subset of the plurality of electrodes; selectively couple a shield signal to a second subset of the plurality of electrodes; and selectively couple an excitation signal to a third subset of the plurality of electrodes, wherein the third subset includes a first barrier electrode that is adjacent to an edge electrode of the first subset; measure signals from the first subset by the sensing channels at a first phase; drive the second subset with the shield signal while measuring the signals on the first subset; and drive the third subset with the excitation signal while measuring the signals on the first subset, wherein the excitation signal is greater in magnitude than the shield signal; selectively couple an excitation signal to a fourth subset of the plurality of electrodes, wherein the fourth subset includes a second barrier electrode that adjacent to an edge electrode of the first subset; measure signals from the first subset by the sensing channels at a second phase; drive the second subset with the shield signal while measuring the signals on the first subset; and drive the fourth subset with the excitation 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, 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. - View Dependent Claims (17, 18, 19, 20)
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21. 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:
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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 capacitance sense array comprises a plurality of row electrodes and a plurality of column electrodes, wherein the first barrier electrode is a first row electrode of the plurality of row electrodes, the second barrier is a second row electrode of the plurality of row electrodes, and the first subset includes row electrodes of the plurality of row electrodes, the row electrodes being between the first row electrode and the second row electrode. - View Dependent Claims (22)
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Specification