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In-cell touch panel and display device, touch driving method

  • US 10,514,788 B2
  • Filed: 02/10/2015
  • Issued: 12/24/2019
  • Est. Priority Date: 11/06/2014
  • Status: Active Grant
First Claim
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1. An in-cell touch panel, comprising an array substrate that includes gate lines and a common electrode layer, and an opposed substrate disposed oppositely to the array substrate, wherein:

  • the common electrode layer of the array substrate is partitioned into a plurality of sub- electrodes arranged in an array, wherein sub-electrodes that are disposed alternately in a respective row of sub-electrodes serve as touch driving sub-electrodes which form a touch driving electrode, and sub-electrodes other than the touch driving sub-electrodes serve as common sub-electrodes;

    upon a line-by-line scanning of gate lines covered by respective rows of sub-electrodes, in a time period when sub-electrodes in a currently-scanned row of sub-electrodes are used to be applied with a common electrode signal, touch driving electrodes in rows of sub-electrodes other than the currently-scanned row of sub-electrodes are used to be applied with touch driving signals;

    the opposed substrate includes a plurality of touch sensing electrodes disposed across and over the touch driving electrodes, and an orthogonal projection of each of the touch sensing electrodes on the array substrate is located within an area where a corresponding common sub-electrode is located;

    in a non-display area and/or a display area the array substrate is provided with;

    touch signal lines that have one-to-one correspondence with the touch driving electrodes, display control lines, and a common electrode signal line;

    in each row of sub-electrodes, a corresponding touch driving electrode is connected with a corresponding touch signal line via a touch switching device;

    the touch switching device is configured to conduct between the corresponding touch signal line and the corresponding touch driving electrode when gate lines covered by rows of sub-electrodes other than the corresponding row of sub-electrodes are being scanned line by line;

    in each row of sub-electrodes, a corresponding touch driving electrode is connected with the common electrode signal line via a display switching device, and a control end of the display switching device is connected with a corresponding display control line;

    the display switching device is configured to conduct between the common electrode signal line and the corresponding touch driving electrode when gate lines covered by the corresponding row of sub-electrodes are being scanned line by line;

    a display control line corresponding to each touch driving electrode is connected with gate lines covered by the corresponding touch driving electrode via turning-on switching devices, and is connected with a last scanned gate line covered by the corresponding touch driving electrode via a turning-off switching device, and a control end of the turning-off switching device is connected with a touch signal line that corresponds to the corresponding touch driving electrode; and

    the turning-on switching devices and the turning-off switching device are configured to allow the display control line to have control signals with opposite polarities when gate lines covered by the corresponding row of sub-electrodes are being scanned and when the scanning of the gate lines covered by the corresponding row of sub-electrodes is completed.

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