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

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Zhao, Jiayang
• Primary Examiner(s): Snyder, Adam J
• Application Number:
  US14/342,202
• Publication Number:
  US 20150070303A1
• Time in Patent Office: 1,202 Days
• Field of Search: 345/174, 178/18.06
• US Class Current: 1/1
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

The present disclosure discloses a touch screen and a driving method therefore. The touch screen embeds touch control electrodes in a display panel, the touch control electrodes includes touch control signal input electrodes and touch control signal output electrodes which are cross-insulated configured, 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. The touch screen according to the present disclosure divides the common electrodes into a plurality of areas along a direction of the data lines, and uses the areas as touch control signal input electrodes. The present disclosure uses a voltage disturbance generated by common electrodes used as driving electrodes to balance out a reduction of pixel voltage, thereby disturbance impact brought by a scan of the common electrodes is reduced and the quality of the picture is improved.

Claims

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.

2. The touch screen according to claim 1, wherein the touch control signal output electrodes are formed by the data lines or second common electrode lines parallel to the data lines.

3. The touch screen according to claim 2, wherein the touch screen further comprises common electrode leads, configured to lead every areas of the first common electrodes to a common voltage supply circuit.

4. The touch screen according to claim 1, wherein the touch screen further comprises common electrode leads, configured to lead respective areas of the first common electrodes to a common voltage supply circuit.

5. The touch screen according to claim 1, wherein the impulse response period is 0-2 ms.

6. A driving method for 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, the first common electrodes being divided into a plurality of areas at least along a direction of the data lines;

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

the areas of first common electrodes being insulated from each other and used as the touch control signal input electrodes;

the driving method comprising;

applying a pixel signal onto pixel electrodes of the pixels corresponding to respective areas of the first common electrodes progressively;

for each area of the first common electrodes, upon pixel electrodes in a last row of pixels corresponding to said area are applied with the pixel signal, applying a touch control detection drive signal onto said area of 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, and detecting voltages or currents of the touch control signal output electrodes, said impulse response period is a period after the pixel electrodes are applied with the pixel signal and during which a voltage of the pixel electrodes of the pixels in the area of the first common electrodes reduces by a certain value.

7. The driving method for a touch screen according to claim 6, wherein, for each area of the first common electrodes, an application of the touch control detection drive signal is completed 0-2 ms after the pixel signal has been applied onto the pixel electrodes in the last row of pixels corresponding to said area of the first common electrode.

8. The driving method for a touch screen according to claim 7, wherein, for each area of the first common electrodes, an application of the touch control detection drive signal is completed 1 ms after the pixel signal has been applied onto the pixel electrodes in the last row of pixels corresponding to said area of the first common electrode.

9. The driving method for a touch screen according to claim 8, further comprising:

determining touch position(s) according to variations of mutual capacitances formed by the touch control signal input electrodes and the touch control signal output electrodes.

10. The driving method for a touch screen according to claim 7, further comprising:

determining touch position(s) according to variations of mutual capacitances formed by the touch control signal input electrodes and the touch control signal output electrodes.

11. The driving method for a touch screen according to claim 6, further comprising:

determining touch position(s) according to variations of mutual capacitances formed by the touch control signal input electrodes and the touch control signal output electrodes.