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Support of narrow tip styluses on touch screen devices

  • US 10,175,807 B2
  • Filed: 12/18/2015
  • Issued: 01/08/2019
  • Est. Priority Date: 12/18/2015
  • Status: Active Grant
First Claim
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1. An electronic device, comprising:

  • a touch screen controller configured to;

    identify an island in a matrix of acquired touch data values, the island comprising adjacent touch data values indicating a potential touch of a touch screen;

    calculate a first sharpness of the island using a first normalization type and not a second normalization type;

    calculate a second sharpness of the island using the first and second normalization types when the first sharpness is greater than a sharpness threshold;

    determine a dynamic variance threshold as a function of the second sharpness when the first sharpness is greater than the sharpness threshold; and

    when the first sharpness is greater than the sharpness threshold, determine a dynamic strength threshold as a function of the second sharpness if a variance of the island is greater than the dynamic variance threshold and determine the island to be a valid stylus island if a peak strength of the island is greater than the dynamic strength threshold.

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