Active matrix capacitive sensor for common-mode cancellation
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United States of America Patent
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Jan 30, 2018
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N/A
app pub date -
Dec 18, 2015
filing date -
Aug 5, 2015
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Abstract
This disclosure generally provides an input device that includes a plurality of sensor modules coupled to sensor electrodes arranged in a matrix that measure capacitive sensing signals corresponding to the electrodes. To mitigate the effect of capacitive coupling between a sensor electrode being sensed and its neighbors in the matrix, the input device drives the neighboring electrodes in a same manner as the selected sensor electrode so that there is little or no voltage difference between the sensor electrode being sensed and its neighbors. For example, during a drive phase, the electrode being sensed and the neighboring electrodes are coupled to the same charge voltage. During a read phase, the neighboring electrodes and the selected electrode may be coupled to the same reference voltage—e.g., ground—so there is again no voltage difference between the electrodes.
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