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Touch sensor having multiple code matrices and driving method thereof

  • US 9,519,388 B2
  • Filed: 07/21/2014
  • Issued: 12/13/2016
  • Est. Priority Date: 08/06/2013
  • Status: Active Grant
First Claim
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1. A touch sensor, comprising:

  • a plurality of driving electrodes;

    a plurality of sensing electrodes crossing the driving electrodes;

    a touch driver to supply a touch driving signal to the driving electrodes;

    a voltage measuring unit to measure output voltages of the sensing electrodes for each time period;

    a noise detecting unit to detect a frequency of noise in at least one of the sensing electrodes;

    a memory to store a plurality of code matrices; and

    a capacitance calculating unit to select one matrix of the code matrices in the memory according to the detected frequency of the noise of the at least one of the sensing electrodes, and to calculate a capacitance between the at least one of the sensing electrodes and at least one of the driving electrodes using the selected one matrix of the code matrices and a voltage matrix, whereinthe voltage matrix includes a measured output voltage corresponding to the at least one of the sensing electrodes.

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