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Multi-phase scanning

  • US 10,216,314 B2
  • Filed: 03/09/2016
  • Issued: 02/26/2019
  • Est. Priority Date: 08/25/2010
  • Status: Active Grant
First Claim
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1. A method of detecting objects proximate to a touch panel having a plurality of TX electrodes and a plurality of RX electrodes, comprising:

  • receiving two distinct drive signals;

    for each of a plurality of scanning stages;

    selecting a TX pattern for a first scanning stage of the plurality of scanning stages;

    selecting a respective one of the two distinct drive signals to drive each of the plurality of TX electrodes substantially simultaneously according to a respective TX pattern, wherein the respective TX pattern for each scanning stage, after the first scanning stage, is generated by a cyclic rotation of the TX pattern for the first scanning stage, and each pair of the plurality of TX electrodes has at least one stage in which the selected drive signals are distinct from each other; and

    receiving sense signals from the plurality of RX electrodes, wherein each of the plurality of sense signals represents capacitance of a respective intersection of a respective TX electrode and a respective RX electrode; and

    correlating the received sense signals for the plurality of scanning stages with the received drive signals to detect an object proximate to the touch panel.

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