Methods and systems for detecting a position-based attribute of an object using digital codes

  • US 7,868,874 B2
  • Filed: 11/15/2005
  • Issued: 01/11/2011
  • Est. Priority Date: 11/15/2005
  • Status: Active Grant
First Claim
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1. A method of detecting a position of a pointer with respect to a touch-sensitive region comprising a plurality of electrodes, the method comprising the steps of:

  • simultaneously applying a first one of a plurality of distinct modulation signals to an associated first one of the plurality of electrodes and a second one of the plurality of distinct modulation signals to an associated second one of the plurality of electrodes to obtain a resultant signal that is electrically affected by the position of the pointer, wherein each of the plurality of distinct modulation signals is based on a different one of a plurality of distinct digital codes;

    demodulating the resultant signal using the plurality of distinct digital codes to thereby discriminate electrical effects produced by the pointer; and

    determining the position of the pointer with respect to the plurality of electrodes from the electrical effects.

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