Driving sensor electrodes for proximity sensing
First Claim
1. A processing system, comprising:
- a sensor module comprising sensor circuitry, the sensor module configured to;
drive, during a first time period, a first sensor electrode of a first plurality of sensor electrodes for absolute capacitive sensing, a second sensor electrode of the first plurality of sensor electrodes with a reference signal, and at least one sensor electrode of a second plurality of sensor electrodes with a guard signal, to acquire first changes of capacitance between the first sensor electrode and at least one input object in proximity with the first sensor electrode; and
a determination module configured to determine positional information for the at least one input object based at least in part on changes of capacitance acquired by the sensor module.
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Abstract
In an example, a processing system includes: a sensor module comprising sensor circuitry, the sensor module configured to: drive, during a first time period, a first sensor electrode of a first plurality of sensor electrodes for absolute capacitive sensing, a second sensor electrode of the first plurality of sensor electrodes with a reference signal, and at least one sensor electrode of a second plurality of sensor electrodes with a guard signal, to acquire first changes of capacitance between the first sensor electrode and at least one input object in proximity with the first sensor electrode; and a determination module configured to determine positional information for the at least one input object based at least in part on changes of capacitance acquired by the sensor module.
28 Citations
20 Claims
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1. A processing system, comprising:
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a sensor module comprising sensor circuitry, the sensor module configured to;
drive, during a first time period, a first sensor electrode of a first plurality of sensor electrodes for absolute capacitive sensing, a second sensor electrode of the first plurality of sensor electrodes with a reference signal, and at least one sensor electrode of a second plurality of sensor electrodes with a guard signal, to acquire first changes of capacitance between the first sensor electrode and at least one input object in proximity with the first sensor electrode; anda determination module configured to determine positional information for the at least one input object based at least in part on changes of capacitance acquired by the sensor module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of driving sensor electrodes for capacitive sensing, comprising:
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driving, during a first time period, a first sensor electrode of a first plurality of sensor electrodes for absolute capacitive sensing, a second sensor electrode of the first plurality of sensor electrodes with a reference signal, and at least one sensor electrode of a second plurality of sensor electrodes with a guard signal, to acquire first changes of capacitance between the first sensor electrode and at least one input object in proximity with the first sensor electrode; and detecting the at least one input object based at least in part on changes of capacitance acquired by the sensor module. - View Dependent Claims (13, 14, 15)
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16. An input device, comprising:
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first plurality of sensor electrodes and a second plurality of sensor electrodes; a processing system coupled to the first and second pluralities of sensor electrodes, the processing system configured to; drive, during a first time period, a first sensor electrode of a first plurality of sensor electrodes for absolute capacitive sensing, a second sensor electrode of the first plurality of sensor electrodes with a reference signal, and at least one sensor electrode of a second plurality of sensor electrodes with a guard signal, to acquire first changes of capacitance between the first sensor electrode and at least one input object in proximity with the first sensor electrode; and detect the at least one input object based at least in part on changes of capacitance acquired by the sensor module. - View Dependent Claims (17, 18, 19, 20)
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Specification