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Alternating, complementary conductive element pattern for multi-touch sensor

  • US 8,941,595 B2
  • Filed: 08/18/2009
  • Issued: 01/27/2015
  • Est. Priority Date: 10/01/2008
  • Status: Active Grant
First Claim
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1. A method of determining touch locations on a touch sensor having conductive elements connected to a touch controller, the touch controller configured to measure changes in capacitance of each of the conductive elements, the method comprising:

  • (a) selecting a group of conductive elements overlapped by a touch based on the measurements of the touch controller;

    (b) determining a weighted average of coordinates of centers of each of the conductive elements;

    (c) associating a touch position with the determined weighted average of the selected group of overlapping conductive elements;

    (d) selecting a first conductive element in the group of conductive elements overlapped by a touch that has a largest overlapping area;

    (e) selecting a threshold area for sensitivity;

    (f) determining if the largest overlapping area is greater than the preselected threshold;

    (g) selecting a first group of elements surrounding the selected first conductive element;

    (h) using coordinates of centers of each of the conductive elements in the first group of conducting elements to determine a weighted average of said coordinates;

    (i) associating a touch position with the determined weighted average of the first group of conductive elements;

    (j) marking the first conductive element in said selected first group as ‘

    used’ and

    removing the first conductive element from further consideration in the measurements; and

    (k) repeating steps (d) through (j) with remaining conductive elements in the group of overlapping elements.

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