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Compensation for air gap in an input device

  • US 8,866,796 B2
  • Filed: 12/20/2012
  • Issued: 10/21/2014
  • Est. Priority Date: 12/20/2012
  • Status: Active Grant
First Claim
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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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