In-cell touch screen and display device

• US 9,733,743 B2
• Filed: 02/13/2015
• Issued: 08/15/2017
• Est. Priority Date: 11/06/2014
• Status: Active Grant

• Current Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Inventors: Wang, Haisheng, Dong, Xue
• Primary Examiner(s): Chang, Kent
• Assistant Examiner(s): Edwards, Mark
• Application Number:
  US14/888,145
• Publication Number:
  US 20160328059A1
• Time in Patent Office: 914 Days
• Field of Search: 345174
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires

Abstract

In an in-cell touch panel and a display device, the common electrode layer in the array substrate is partitioned into a plurality of sub-electrodes arranged in an array, spaced sub-electrodes in each column of sub-electrodes serve as touch driving sub-electrodes (a) constituting a touch driving electrode and sub-electrodes other than them serve as common sub-electrodes (b). During line-by-line scanning of gate lines covered by a row of sub-electrodes, the row of sub-electrodes are applied with common electrode signals, touch driving sub-electrodes in other rows of sub-electrodes are applied with touch driving signals, and common sub-electrodes in other rows of sub-electrodes are applied with common electrode signals. The in-cell touch panel can avoid various display and touch problems resulted from deficiency of time caused by time-division driving.

Claims

1. An in-cell touch panel comprising:

an array substrate comprising gate lines and a common electrode layer, and an opposing substrate disposed oppositely to the array substrate, wherein;

the common electrode layer of the array substrate comprises a plurality of sub-electrodes arranged in an array;

spaced sub-electrodes in each column of the sub-electrodes serve as touch driving sub-electrodes constituting a touch driving electrode, and sub-electrodes other than the touch driving sub-electrodes serve as common sub-electrodes;

during line-by-line scanning of the gate lines covered by each row of sub-electrodes, sub-electrodes in the row are used to be applied with common electrode signals for conducting a displaying function, touch driving sub-electrodes in rows other than the row of sub-electrodes are used to be applied with touch driving signals for conducting a touch driving function, and common sub-electrodes in rows other than the row of sub-electrodes are used to be applied with common electrode signals;

in a non-display area the array substrate is provided with display control lines and touch control lines in one-to-one correspondence with sub-electrode rows comprising touch driving sub-electrodes;

each display control line corresponding to a corresponding row of sub-electrodes is connected with a gate line covered by the row of sub-electrodes via a turning-on switching device, and is connected with a last-scanned gate line covered by the row of sub-electrodes via a turning-off switching device, and a control end of the turning-off switching device is connected with a touch control line corresponding to the row of sub-electrodes; and

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

2. The in-cell touch panel of claim 1, wherein, the opposing substrate comprises a plurality of touch sensing electrodes that are disposed to intersect the touch driving electrodes, and orthogonal projections of the touch sensing electrodes on the array substrate are located in an area where the common sub-electrodes are located.

3. The in-cell touch panel of claim 1, wherein, in the non-display area, the array substrate is also provided with:

touch signal lines in a one-to-one correspondence with the touch driving electrodes, and common electrode signal lines.

4. The in-cell touch panel of claim 3, wherein,

in each row of sub-electrodes, touch driving sub-electrodes are connected with touch signal lines corresponding to touch driving electrodes, to which they belong, via touch switching devices, and control ends of the touch switching devices are connected with a touch control line corresponding to the row of sub-electrodes;

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

in each row of sub-electrodes, the touch driving sub-electrodes are connected with the common electrode signal line via display switching devices, and control ends of the display switching devices are connected with display control line corresponding to the row of sub-electrodes;

the display switching devices are configured to conduct between the common electrode signal lines and the touch driving sub-electrodes when the gate lines covered by the row of sub-electrodes are scanned line by line.

5. The in-cell touch panel of claim 4, wherein, each of the touch switching devices comprises:

a first switching transistor with a gate electrode connected with one of the touch control lines, a drain electrode connected with one of the touch driving sub-electrodes, and a source electrode connected with one of the touch signal lines.

6. The in-cell touch panel of claim 5, wherein,

each of the display switching devices comprises:

a second switching transistor with a gate electrode connected with one of the display control lines, a drain electrode connected with one of the touch driving sub-electrodes, and a source electrode connected with the common electrode signal line.

7. The in-cell touch panel of claim 6, wherein, the first switching transistor and the second switching transistor are both N-type transistors or P-type transistors and the display control line and the touch control line corresponding to a same row of sub-electrodes are configured to apply control signals with opposite polarities at the same time;

or

the first switching transistor and the second switching transistor are an N-type transistor and a P-type transistor respectively and the display control line and the touch control line corresponding to a same row of sub-electrodes are configured to apply control signals with a same polarity at the same time.

8. The in-cell touch panel of claim 1, wherein, the turning-on switching device is a third switching transistor with a gate electrode and a source electrode connected with a corresponding gate line, and a drain electrode connected with the display control line;

and

the turning-off switching device is a fourth switching transistor with a gate electrode connected with the touch control line, a source electrode connected with a corresponding gate line, and a drain electrode connected with the display control line.

9. The in-cell touch panel of claim 1, wherein the plurality of sub-electrodes arranged in an array is resulted from a partitioning of the common electrode layer, and the touch driving sub-electrodes and the common sub-electrodes are arranged alternatively in both row and column directions of a matrix.

10. The in-cell touch panel of claim 1, wherein the plurality of sub-electrodes arranged in an array is resulted from a partitioning of the common electrode layer, and the touch driving sub-electrodes and the common sub-electrodes are arranged in corresponding rows of a matrix.

11. A display device, comprising the in-cell touch panel of claim 1.

12. The in-cell touch panel of claim 2, wherein the plurality of sub-electrodes arranged in an array is resulted from a partitioning of the common electrode layer, and the touch driving sub-electrodes and the common sub-electrodes are arranged alternatively in both row and column directions of a matrix.

13. The in-cell touch panel of claim 2, wherein the plurality of sub-electrodes arranged in an array is resulted from a partitioning of the common electrode layer, and the touch driving sub-electrodes and the common sub-electrodes are arranged in corresponding rows of a matrix.

14. The in-cell touch panel of claim 3, wherein the plurality of sub-electrodes arranged in an array is resulted from a partitioning of the common electrode layer, and the touch driving sub-electrodes and the common sub-electrodes are arranged alternatively in both row and column directions of a matrix.

15. The in-cell touch panel of claim 3, wherein the plurality of sub-electrodes arranged in an array is resulted from a partitioning of the common electrode layer, and the touch driving sub-electrodes and the common sub-electrodes are arranged in corresponding rows of a matrix.

16. The in-cell touch panel of claim 4, wherein the plurality of sub-electrodes arranged in an array is resulted from a partitioning of the common electrode layer, and the touch driving sub-electrodes and the common sub-electrodes are arranged alternatively in both row and column directions of a matrix.

17. The in-cell touch panel of claim 4, wherein the plurality of sub-electrodes arranged in an array is resulted from a partitioning of the common electrode layer, and the touch driving sub-electrodes and the common sub-electrodes are arranged in corresponding rows of a matrix.