Mitigating common mode display noise using hybrid estimation approach
First Claim
1. A processing system configured for capacitive sensing, the processing system comprising:
- sensor circuitry with functionality to;
acquire a first absolute capacitive profile for a first plurality of sensor electrodes; and
acquire a transcapacitive image using the first plurality of sensor electrodes;
wherein the processing system is configured to;
create a first estimate of common mode noise using the first absolute capacitive profile and the transcapacitive image;
determine a location lacking an input object in the transcapacitive image using the first estimate of common mode noise;
create a second estimate of common mode noise based on the location and the transcapacitive image;
determine positional information of the input object using the second estimate of common mode noise; and
process the positional information.
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Accused Products
Abstract
A processing system configured for capacitive sensing includes sensor circuitry with functionality to acquire an absolute capacitive profile for sensor electrodes, and acquire a transcapacitive image using the sensor electrodes. The processing system is configured to create a first estimate of common mode noise using the absolute capacitive profile and the transcapacitive image, determine a location lacking an input object in the transcapacitive image using the first estimate of common mode noise, create a second estimate of common mode noise based on the location and the transcapacitive image, determine positional information of the input object using the second estimate of common mode noise, and process the positional information.
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Citations
20 Claims
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1. A processing system configured for capacitive sensing, the processing system comprising:
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sensor circuitry with functionality to; acquire a first absolute capacitive profile for a first plurality of sensor electrodes; and acquire a transcapacitive image using the first plurality of sensor electrodes; wherein the processing system is configured to; create a first estimate of common mode noise using the first absolute capacitive profile and the transcapacitive image; determine a location lacking an input object in the transcapacitive image using the first estimate of common mode noise; create a second estimate of common mode noise based on the location and the transcapacitive image; determine positional information of the input object using the second estimate of common mode noise; and process the positional information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An input device for capacitive sensing comprising:
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a first plurality of sensor electrodes for receiving resulting signals from a transmitter electrode; and a processing system configured to; acquire a first absolute capacitive profile for the first plurality of sensor electrodes; acquire a transcapacitive image using the first plurality of sensor electrodes; create a first estimate of common mode noise using the first absolute capacitive profile and the transcapacitive image; determine a location lacking an input object in the transcapacitive image using the first estimate of common mode noise; create a second estimate of common mode noise based on the location and the transcapacitive image; determine positional information of the input object using the second estimate of common mode noise; and process the positional information. - View Dependent Claims (11)
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12. A method for mitigating common mode noise, the method comprising:
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acquiring a first absolute capacitive profile for a first plurality of sensor electrodes; acquiring a transcapacitive image using the first plurality of sensor electrodes; creating a first estimate of common mode noise using the first absolute capacitive profile and the transcapacitive image; determining a location lacking an input object in the transcapacitive image using the first estimate of common mode noise; creating a second estimate of common mode noise based on the location and the transcapacitive image; determining positional information of the input object using the second estimate of common mode noise; and processing the positional information. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification