Method and system for low ground mass correction
First Claim
1. A processing system for an input device, the processing system comprising:
- a sensor circuitry configured to be coupled to a first plurality of sensor electrodes and a second plurality of sensor electrodes, the sensor circuitry configured to;
acquire a first plurality of mutual capacitive measurements between the first plurality of sensor electrodes and the second plurality of sensor electrodes, andacquire a first plurality of absolute capacitive measurements of the first plurality of sensor electrodes and the second plurality of sensor electrodes; and
a determination circuitry configured to;
determine a first projection from the first plurality of mutual capacitive measurements and a first profile from the first plurality of absolute capacitive measurements,wherein determining the first projection comprises;
for each sensor electrode of at least of a subset of the first plurality of sensor electrodes on a first axis, summing a subset of the first plurality of mutual capacitive measurements along the length of the sensor electrode to obtain a summed value for the sensor electrode, andwherein the first projection comprises the summed value for each of a least the subset of the first plurality of sensor electrodes, anddetermine a low ground mass correction factor based on a good ground value, the first projection, and the first profile.
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Accused Products
Abstract
A processing system for an input device includes a sensor module coupled to first sensor electrodes and second sensor electrodes. The sensor module includes sensor circuitry and is configured to acquire mutual capacitive measurements between the first sensor electrodes and the second sensor electrodes, and acquire absolute capacitive measurements of the first sensor electrodes and the second sensor electrodes. The processing system further includes a determination module configured to determine a projection from the mutual capacitive measurements and a profile from the absolute capacitive measurements, and determine a low ground mass correction factor based on a good ground value, the projection, and the profile.
22 Citations
18 Claims
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1. A processing system for an input device, the processing system comprising:
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a sensor circuitry configured to be coupled to a first plurality of sensor electrodes and a second plurality of sensor electrodes, the sensor circuitry configured to; acquire a first plurality of mutual capacitive measurements between the first plurality of sensor electrodes and the second plurality of sensor electrodes, and acquire a first plurality of absolute capacitive measurements of the first plurality of sensor electrodes and the second plurality of sensor electrodes; and a determination circuitry configured to; determine a first projection from the first plurality of mutual capacitive measurements and a first profile from the first plurality of absolute capacitive measurements, wherein determining the first projection comprises; for each sensor electrode of at least of a subset of the first plurality of sensor electrodes on a first axis, summing a subset of the first plurality of mutual capacitive measurements along the length of the sensor electrode to obtain a summed value for the sensor electrode, and wherein the first projection comprises the summed value for each of a least the subset of the first plurality of sensor electrodes, and determine a low ground mass correction factor based on a good ground value, the first projection, and the first profile. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An input device comprising:
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a first plurality of sensor electrodes and a second plurality of sensor electrodes configured to sense input objects in a sensing region of the input device; and a processing system configured to; acquire a first plurality of mutual capacitive measurements between the first plurality of sensor electrodes and the second plurality of sensor electrodes, acquire a first plurality of absolute capacitive measurements of the first plurality of sensor electrodes and the second plurality of sensor electrodes, determine a first projection from the first plurality of mutual capacitive measurements and a first profile from the first plurality of absolute capacitive measurements, wherein the first projection is determined by, at least; for each sensor electrode of at least of a subset of the first plurality of sensor electrodes on a first axis, summing a subset of the first plurality of mutual capacitive measurements along the length of the sensor electrode to obtain a summed value for the sensor electrode, and wherein the first projection comprises the summed value for each of a least the subset of the first plurality of sensor electrodes, and determine a low ground mass correction factor based on a good ground value, the first projection, and the first profile. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method for capacitive sensing of an input device, the method comprising:
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acquiring a first plurality of mutual capacitive measurements between a first plurality of sensor electrodes and a second plurality of sensor electrodes; acquiring a first plurality of absolute capacitive measurements of the first plurality of sensor electrodes and the second plurality of sensor electrodes; determining a first projection from the first plurality of mutual capacitive measurements and a first profile from the first plurality of absolute capacitive measurements, wherein determining the first projection comprises; for each sensor electrode of at least of a subset of the first plurality of sensor electrodes on a first axis, summing a subset of the first plurality of mutual capacitive measurements along the length of the sensor electrode to obtain a summed value for the sensor electrode, and wherein the first projection comprises the summed value for each of a least the subset of the first plurality of sensor electrodes; determining a low ground mass correction factor based on a good ground value, the first projection, and the first profile; determining positional information for an input object based on the first plurality of mutual capacitive measurements and the low ground mass correction coefficient; and reporting the positional information. - View Dependent Claims (17, 18)
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Specification