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Method of driving touch panel, capacitance-type touch panel, and display apparatus with detection function

  • US 9,977,535 B2
  • Filed: 03/24/2017
  • Issued: 05/22/2018
  • Est. Priority Date: 06/29/2009
  • Status: Active Grant
First Claim
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1. A capacitance-type touch panel comprising:

  • a plurality of drive electrodes;

    a drive control circuit which selectively applies a drive signal for touch detection to the drive electrodes;

    a plurality of touch detection electrodes which form capacitance with the drive electrodes, each of the touch detection electrodes outputting a detection signal in synchronization with the drive signal; and

    a detection circuit which detects an external proximity object based on the detection signals, wherein the drive control circuit applies the drive signal such that a positive drive signal is selectively applied to a first one of the drive electrodes having a first width that is a total width of the drive electrodes belonging to a first group, in a first period wherein a negative drive signal is applied to a second group of drive electrodes in a second period different from the first period, the second group being divided into discretely arranged sub groups and each of the sub groups having a second width that is a total width of the drive electrodes belonging to each of the sub groups of the second group,wherein the first width is greater than the second width, and wherein the detection circuit detects the external proximity object based on a shift of the time-average level of the detection signal both in the first period and the second period with respect to a center voltage of the detection signal.

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