Combining trans-capacitance data with absolute-capacitance data for touch force estimates
AssigneeSynaptics Incorporated
InventorsPetr SHEPELEV, Andrew WINGARD
Life of this patent
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Abstract
Techniques for obtaining force-based data of an input device are provided. The techniques include driving sensor electrodes in transcapacitive mode and in absolute capacitive mode, obtaining profiles for each of the modes, scaling the transcapacitive profile, and subtracting the scaled transcapacitive profile from the profile for absolute capacitive sensing. The result of this subtraction is force-based data that indicates the degree of force with that input object applies to the input device.
Claims20
A method for obtaining force-based data associated with a touch event, the method comprising:
- driving a plurality of sensor electrodes in transcapacitive mode to obtain a plurality of transcapacitive measurements;
- driving the plurality of sensor electrodes in absolute capacitive mode to obtain a plurality of absolute capacitive measurements;
- and
- determining the force-based data based on differences between the plurality of transcapacitive measurements and the plurality of absolute capacitive measurements.
A processing system for obtaining force-based data associated with a touch event, the processing system comprising:
- sensing circuitry configured to:
- drive a plurality of sensor electrodes in transcapacitive mode to obtain a plurality of transcapacitive measurements, and
- drive the plurality of sensor electrodes in absolute capacitive mode to obtain a plurality of absolute capacitive measurements;
- and
- a determination processor configured to:
- determine the force-based data based on differences between the plurality of transcapacitive measurements and the plurality of absolute capacitive measurements.
An input device for obtaining force-based data associated with a touch event, the input device comprising:
- a plurality of sensor electrodes;
- and
- a processing system comprising:
- sensing circuitry configured to:
- drive a plurality of sensor electrodes in transcapacitive mode to obtain a plurality of transcapacitive measurements, and
- drive the plurality of sensor electrodes in absolute capacitive mode to obtain a plurality of absolute capacitive measurements;
- and
- a determination processor configured to:
- determine the force-based data based on differences between the plurality of transcapacitive measurements and the plurality of absolute capacitive measurements.
Dependencies are inferred from the claim text.