REDUCED CAPACITIVE BASELINE SHIFT VIA SWITCHING ELEMENTS
First Claim
1. A method comprising:
- driving, onto a first group of a plurality of sensor electrodes, a first capacitive sensing signal having a predefined first sensing frequency;
acquiring, based on the driven first capacitive sensing signal, first baseline capacitive measurements of resulting signals received by a second group of the plurality of sensor electrodes, wherein acquiring first baseline capacitive measurements comprises applying a first demodulation signal having a predefined mixing period defined within a sensing period associated with the first sensing frequency; and
operating, based on the first demodulation signal, one or more switching elements coupled with one or more sensor electrodes of the first group or the second group, wherein the one or more switching elements are in a conducting state during the mixing period.
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Abstract
A method and related processing system and input device are disclosed, the method comprising driving a first capacitive sensing signal having a predefined first sensing frequency onto a first group of a plurality of sensor electrodes, and acquiring first capacitive measurements of resulting signals received by a second group of the plurality of sensor electrodes. Acquiring first capacitive measurements comprises applying a first demodulation signal having a predefined mixing period defined within a sensing period associated with the first sensing frequency. The method further comprises operating, based on the first demodulation signal, one or more switching elements coupled with one or more sensor electrodes of the first group or the second group, wherein the one or more switching elements are in a conducting state during the mixing period.
10 Citations
20 Claims
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1. A method comprising:
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driving, onto a first group of a plurality of sensor electrodes, a first capacitive sensing signal having a predefined first sensing frequency; acquiring, based on the driven first capacitive sensing signal, first baseline capacitive measurements of resulting signals received by a second group of the plurality of sensor electrodes, wherein acquiring first baseline capacitive measurements comprises applying a first demodulation signal having a predefined mixing period defined within a sensing period associated with the first sensing frequency; and operating, based on the first demodulation signal, one or more switching elements coupled with one or more sensor electrodes of the first group or the second group, wherein the one or more switching elements are in a conducting state during the mixing period. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A processing system comprising:
a sensing module comprising sensing circuitry and configured to; drive, onto a first group of a plurality of sensor electrodes, a first capacitive sensing signal having a predefined first sensing frequency; acquire, based on the driven first capacitive sensing signal, first baseline capacitive measurements of resulting signals received by a second group of the plurality of sensor electrodes, wherein acquiring first baseline capacitive measurements comprises applying a first demodulation signal having a predefined mixing period defined within a sensing period associated with the first sensing frequency; and operate, based on the first demodulation signal, one or more switching elements coupled with one or more sensor electrodes of the first group or the second group, wherein the one or more switching elements are in a conducting state during the mixing period. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. An input device comprising:
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a plurality of sensor electrodes; a plurality of switching elements coupled with the plurality of sensor electrodes; and a processing system configured to; drive, onto a first group of the plurality of sensor electrodes, a first capacitive sensing signal having a predefined first sensing frequency; acquire, based on the driven first capacitive sensing signal, first baseline capacitive measurements of resulting signals received by a second group of the plurality of sensor electrodes, wherein acquiring first baseline capacitive measurements comprises applying a first demodulation signal having a predefined mixing period defined within a sensing period associated with the first sensing frequency; and operate, based on the first demodulation signal, one or more switching elements coupled with one or more sensor electrodes of the first group or the second group, wherein the one or more switching elements are in a conducting state during the mixing period. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification