Compensation for air gap in an input device
First Claim
1. A processing system for a display device integrated with a capacitive sensing device comprising:
- a driver module comprising driver circuitry, the driver module coupled to a plurality of common electrodes configured to be driven for display updating and capacitive sensing;
a receiver module coupled to a plurality of receiver electrodes and configured for receiving resulting signals with the receiver electrodes when the plurality of common electrodes are driven for capacitive sensing by the driver module; and
a determination module configured for;
determining a first capacitive image based on the resulting signals;
comparing the first capacitive image to a baseline capacitive image to determine a delta capacitive image;
comparing the delta capacitive image to one or more saturation capacitance values;
in response to the comparing, replacing the one or more saturation capacitance values with one or more capacitance values from the delta capacitive image; and
determining one or more calibration values based on the one or more saturation capacitance values, wherein the one or more calibration values calibrate for an air gap defined between a cover lens of a display device integrated with a capacitive sensing device and the plurality of common electrodes.
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Abstract
Embodiments of the present invention generally provide a processing system for a display device integrated with a capacitive sensing device. The processing system includes a driver module, a receiver module, and a determination module. The driver module is coupled to a plurality of common electrodes configured to be driven for display updating and capacitive sensing. The receiver module is coupled to a plurality of receiver electrodes and configured for receiving resulting signals with the receiver electrodes. The determination module is configured for comparing a delta capacitive image to one or more saturation capacitance values and replacing the saturation capacitance values with one or more capacitance values from the delta capacitive image. The determination module is further configured for determining calibration values based on the saturation capacitance values. The calibration values calibrate for an air gap defined between a cover lens of a display device and the plurality of common electrodes.
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Citations
20 Claims
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1. A processing system for a display device integrated with a capacitive sensing device comprising:
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a driver module comprising driver circuitry, the driver module coupled to a plurality of common electrodes configured to be driven for display updating and capacitive sensing; a receiver module coupled to a plurality of receiver electrodes and configured for receiving resulting signals with the receiver electrodes when the plurality of common electrodes are driven for capacitive sensing by the driver module; and a determination module configured for; determining a first capacitive image based on the resulting signals; comparing the first capacitive image to a baseline capacitive image to determine a delta capacitive image; comparing the delta capacitive image to one or more saturation capacitance values; in response to the comparing, replacing the one or more saturation capacitance values with one or more capacitance values from the delta capacitive image; and determining one or more calibration values based on the one or more saturation capacitance values, wherein the one or more calibration values calibrate for an air gap defined between a cover lens of a display device integrated with a capacitive sensing device and the plurality of common electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A display device integrated with a capacitive sensing device comprising:
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a plurality of common electrodes; a plurality of receiver electrodes; a processing system coupled to the plurality of common electrodes and the plurality of receiver electrodes, the processing system configured to; drive the plurality of common electrodes for display updating and capacitive sensing; receive resulting signals with the receiver electrodes when the plurality of common electrodes are driven for capacitive sensing; determine a first capacitive image based on the resulting signals; compare the first capacitive image to a baseline capacitive image to determine a delta capacitive image; compare the delta capacitive image to one or more saturation capacitance values; in response to the comparison, replace the one or more saturation capacitance values with one or more capacitance values from the delta capacitive image; and determine one or more calibration values based on the one or more saturation capacitance values; and a cover lens disposed over the plurality of common electrodes, wherein the one or more calibration values calibrate for an air gap defined between the cover lens and the plurality of common electrodes. - View Dependent Claims (11, 12, 13, 14)
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15. A method of capacitive sensing with a display device integrated with a capacitive sensing device having a plurality of common electrodes and a plurality of receiver electrodes, the method comprising:
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driving the plurality of common electrodes for display updating and capacitive sensing; receiving resulting signals from the receiver electrodes when the plurality of common electrodes are driven for capacitive sensing; determining a first capacitive image based on the resulting signals; comparing the first capacitive image to a baseline capacitive image to determine a delta capacitive image; comparing the delta capacitive image to one or more saturation capacitance values; in response to the comparing, replacing the one or more saturation capacitance values with one or more capacitance values from the delta capacitive image; and determining one or more calibration values based on the one or more saturation capacitance values, wherein the one or more calibration values calibrate for an air gap defined between a cover lens of a display device integrated with a capacitive sensing device and the plurality of common electrodes. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification