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Capacitive touch panel with balanced parallel driving

  • US 9,727,187 B2
  • Filed: 04/16/2015
  • Issued: 08/08/2017
  • Est. Priority Date: 04/16/2015
  • Status: Active Grant
First Claim
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1. A capacitive touch sensor, comprising:

  • an array of electrode elements, each electrode element including a drive electrode and a sense electrode, the drive electrode and the sense electrode forming at least one mutual coupling capacitor in each electrode element; and

    a controller operatively coupled to the array of electrode elements, the controller configured to provide excitation signals to the array of electrode elements over at least one measurement period, and to measure the at least one mutual coupling capacitance over the at least one measurement period, wherein the excitation signals applied during the at least one measurement period are balanced to reduce the effect of baseline capacitance,wherein the controller is configured to represent the excitation signals applied to the drive electrodes over one frame as a drive matrix D having dimension N×

    T, where N is the number of drive electrodes in the array of electrode elements and T is the number of measurement periods in the one frame, each row of the matrix representing a pattern of excitation signals applied to the drive electrodes during a measurement period, and each column of the matrix representing a pattern of excitation signals applied to one drive electrode over the course of a single frame.

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