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Display device with touch detection function, drive circuit, driving method of display device with touch detection function, and electronic unit

  • US 8,933,895 B2
  • Filed: 07/08/2011
  • Issued: 01/13/2015
  • Est. Priority Date: 08/23/2010
  • Status: Active Grant
First Claim
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1. A display device with a touch detection function comprising:

  • a plurality of common drive electrodes arranged side by side to extend in one direction;

    a display element performing display, based on a pixel signal and a display drive signal;

    a touch detection element of electrostatic capacitance type detecting an external proximity object based on a touch detection drive signal with an amplitude larger than that of the display drive signal; and

    a scan drive section performing first scan drive and second scan drive, the first scan drive allowing the plurality of common drive electrodes to be sequentially supplied with the display drive signal in a time-divisional manner, and the second scan drive allowing the plurality of common drive electrodes to be sequentially supplied with the touch detection drive signal in a time-divisional manner,wherein the scan drive section includes;

    a drive signal control circuit to which a first select signal for selecting one of the common drive electrodes as a target of the first scan drive and a second select signal for selecting one of the common drive electrodes as a target of the second scan drive are supplied,a first switch allowing the target of the first scan drive to be supplied with the display drive signal,a second switch allowing the target of the second scan drive to be supplied with the touch detection drive signal, anda third switch allowing one of the common drive electrodes to be supplied with a direct-current potential,wherein the drive signal control circuit is configured to;

    when the first select signal is at a high level and the second select signal is not at the high level, turn on the first switch and turn off the second switch and the third switch to allow the target of the first scan drive to be supplied with the display drive signal,when the first select signal is not at the high level and the second select signal is at the high level, turn off the first switch and the third switch and turn on the second switch to allow the target of the second scan drive to be supplied with the touch detection drive signal,when the first select signal is at the high level and the second select signal is at the high level, turn on the first switch and turn off the second switch and the third switch to allow the target of the first scan drive to be supplied with the display drive signal, andwhen the first select signal is not at high level and the second select signal is not at high level, turn off the first switch and the second switch and turn on the third switch to allow one of the common drive electrodes to be supplied with the direct-current potential.

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