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Base capacitance compensation for a touchpad sensor

  • US 8,115,750 B2
  • Filed: 09/20/2006
  • Issued: 02/14/2012
  • Est. Priority Date: 09/23/2005
  • Status: Active Grant
First Claim
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1. A compensation method for sensed capacitive values of an asymmetric touchpad sensor having X and Y traces of non-uniform geometry, comprising the steps of:

  • calculating base capacitances of a plurality of traces in the asymmetric touchpad sensor to generate a base capacitance profile for determining a distribution of the base capacitances across the touchpad sensor;

    analyzing the distribution for determining a substantially non-uniform variance profile of the base capacitances indicative of non-uniform trace sensitivity across the touchpad sensor; and

    executing a firmware operation based on the variance profile to adaptively modify the sensed capacitive values, the modification being thereby varied in accordance with relative position of the individual non-uniform traces on the touchpad sensor for substantially removing therefrom an offset due to the non-uniform trace sensitivity.

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