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Display device including a sensor, with reducing influence of parasitic capacitance on the sensor, and method of driving display device

  • US 9,746,950 B2
  • Filed: 06/03/2015
  • Issued: 08/29/2017
  • Est. Priority Date: 06/05/2014
  • Status: Active Grant
First Claim
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1. A display device provided with a sensor, comprising:

  • a plurality of electrodes for a touch sensor, which comprise a plurality of drive electrodes arranged side by side to extend in a single direction, and a plurality of detection electrodes extending in a direction crossing the direction in which the drive electrodes extend, and provided to generate capacitances at intersections of the detection electrodes and the drive electrodes; and

    a display panel which includes a plurality of display elements arranged in a matrix, a plurality of gate lines extending along display elements arranged in a row direction, and a plurality of source lines extending along display elements arranged in a column direction,wherein a plurality of common electrodes for display which are provided in the display panel are also applied as the drive electrodes in the plurality of electrodes for the touch sensor,an image display operation of the display panel and a driving operation of the electrodes for the touch sensor are performed in a time sharing manner,in the driving operation of the electrodes for the touch sensor, a code division multiplexing (CDM) drive is performed in units of successive common electrodes, and a drive signal which synchronizes with the CDM drive is input to all common electrodes other than successive common electrodes subjected to the CDM drive, andin the driving operation of the electrodes for the touch sensor, all of the source lines and the gate lines in the display panel are caused to be in a floating state before the CDM drive is performed.

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