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Method and device for capacitive position detection

  • US 8,633,917 B2
  • Filed: 11/30/2011
  • Issued: 01/21/2014
  • Est. Priority Date: 10/09/2009
  • Status: Active Grant
First Claim
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1. A method for capacitive position detection, comprising:

  • obtaining a 2-D sensing information comprising a plurality of 1-D sensing information, wherein each of said plurality of 1-D sensing information comprises a plurality of continuous differences;

    determining a zero-crossing in each of said plurality of 1-D sensing information by said plurality of continuous differences in each of said plurality of 1-D sensing information;

    converting said plurality of continuous differences in each of said plurality of 1-D sensing information into a plurality of continuous signal values or dual differences;

    identifying the signal value or dual difference corresponding to said zero-crossing in each of said plurality of 1-D sensing information as a center signal value or dual difference; and

    determining a centroid position in each of said plurality of 1-D sensing information by applying a number i of said plurality of continuous signal values or dual differences before the center signal value or dual difference in each of said plurality of 1-D sensing information, and a number j of said plurality of continuous signal values or dual differences after the center signal value or dual difference in each of said plurality of 1-D sensing information.

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