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Processing signals from a touchscreen panel

  • US 10,061,434 B2
  • Filed: 11/08/2016
  • Issued: 08/28/2018
  • Est. Priority Date: 11/12/2015
  • Status: Active Grant
First Claim
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1. A method comprising:

  • receiving a first array of values obtained from measuring an array of touch panel sensor areas;

    generating a second array of values based on subtracting a reference array of values from the first array of values, wherein generating the second array comprises;

    generating a third array by subtracting the reference array from the first array; and

    generating the second array by filtering the third array using a spatial low pass filter having a bandwidth equal to a reference bandwidth value;

    determining presence of at least one touch event in dependence upon the second array of values; and

    upon a negative determination;

    generating a new reference array based on exponential smoothing of the reference array and the first array using a weighting factor, or generating a new reference array which is equal to the first array; and

    ,storing the new reference array; and

    upon a positive determination;

    outputting the second arraydetermining, based on a difference of the second array and the third array, a first amount by which values corresponding to at least one touch event are attenuated and a second amount by which values not corresponding to any touch event are attenuated;

    generating a new reference bandwidth value based on the first amount and the second amount; and

    storing the new reference bandwidth value.

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