Touch screen and driving method therefor with an ahead touch control sensing period

  • US 9,436,332 B2
  • Filed: 05/23/2013
  • Issued: 09/06/2016
  • Est. Priority Date: 03/29/2013
  • Status: Active Grant
First Claim
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1. A touch screen with touch control electrodes embedded in a display panel, the touch control electrodes comprising touch control signal input electrodes and touch control signal output electrodes which are cross-insulated configured, the display panel comprising data lines, gate lines and first common electrodes, the gate lines and data lines defining a plurality of pixel units, each pixel unit having a pixel electrode provided therein, wherein,the first common electrodes are divided into a plurality of areas at least along a direction of the data lines;

  • each area of the first common electrodes corresponds to at least one row of pixel units;

    the areas of first common electrodes are insulated from each other and used as the touch control signal input electrodes,wherein the touch screen further comprises;

    a touch control signal input module, configured to apply a touch control detection drive signal onto the touch control signal input electrodes progressively;

    a touch control signal detection module, configured to detect voltages or currents of the touch control signal output electrodes;

    a touch control determination module, configured to determine touch position(s) according to variations of mutual capacitances formed by the touch control signal input electrodes and the touch control signal output electrodes;

    a gate driver configured to drive the gate lines; and

    a synchronizing circuit configured to, after one area of first common electrodes is scanned by the gate driver, cause the touch control signal input module to apply the touch control detection drive signal onto the area of the first common electrodes during an impulse response period, to use a voltage disturbance generated thereby on the pixel electrodes of the respective pixels in the area to balance out a reduction of the voltage on the pixel electrodes during the impulse response period, which is a period after the scan of the area of the first common electrodes is completed and during which a voltage of pixel electrodes of the pixels in the area of the first common electrodes reduces by a certain value.

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