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

• US 10,156,923 B2
• Filed: 09/02/2014
• Issued: 12/18/2018
• Est. Priority Date: 05/30/2014
• 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: Liu, Yingming, Dong, Xue, Wang, Haisheng, Ding, Xiaoliang, Yang, Shengji
• Primary Examiner(s): Michaud, Robert J
• Application Number:
  US14/436,673
• Publication Number:
  US 20160274712A1
• Time in Patent Office: 1,568 Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• 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 3/04166 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 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

An in-cell touch display panel, a driving method thereof and a display device are provided. The display panel includes a common electrode layer and a plurality of touch sensing electrodes. The common electrode layer comprises a plurality of first touch driving electrodes and a plurality of second touch driving electrodes that are configured for loading of common electrode signals in a display period and for loading of touch signals in a touch period. The second touch driving electrodes include a plurality of second touch driving sub-electrodes. Projections of the touch sensing electrodes on an array substrate are at gaps of the second touch driving sub-electrodes that are adjacent within the second touch driving electrodes. With this display panel, the touch sensitivity can be enhanced.

Claims

1. An in-cell touch display panel, comprising:

an array substrate and a color filter substrate;

a common electrode layer on the array substrate, wherein the common electrode layer comprises a plurality of first touch driving electrodes and a plurality of second touch driving electrodes that are disposed alternately in an insulating manner, the second touch driving electrodes comprise a plurality of second touch driving sub-electrodes arranged side by side;

the first touch driving electrodes and the second touch driving electrodes are configured for loading of common electrode signals in a display period, and for loading of touch signals in a touch period; and

a plurality of touch sensing electrodes, wherein the plurality of touch sensing electrodes is disposed on the color filter substrate, the second touch driving sub-electrodes are disposed on the array substrate, and each projection of the plurality of touch sensing electrodes projects toward a gap of the second touch driving sub-electrodes in the common electrode layer.

2. The in-cell touch display panel claimed as claim 1, wherein gaps of the second touch driving sub-electrodes correspond to a position of a black matrix on a color filter substrate of the display panel.

3. The in-cell touch display panel claimed as claim 1, wherein the touch sensing electrodes extend along a second direction perpendicular to a first direction, the first direction is an extending direction of data lines on an array substrate, and the second direction is an extending direction of gate lines on the array substrate.

4. The in-cell touch display panel claimed as claim 1, further comprising an electrode protective layer disposed on the first touch driving electrodes and the second touch driving electrodes,

wherein the electrode protective layer is produced in a same layer as a pixel electrode layer of the array substrate, and is not connected to the pixel electrode layer.

5. A driving method of an in-cell touch display panel, wherein the in-cell touch display panel is the in-cell touch display panel claimed as claim 1;

the method comprises;

in a display period, applying common electrode signals to first touch driving electrodes and second touch driving electrodes, and

in a touch period, applying touch scanning signals to the first touch driving electrodes and the second touch driving electrodes.

6. A display device comprising the in-cell touch display panel claimed as claim 1.

7. The in-cell touch display panel claimed as claim 2, wherein along a first direction, the plurality of the first touch driving electrodes and the plurality of the second touch driving electrodes are electrically connected by at least one touch driving signal line in the first direction.

8. The in-cell touch display panel claimed as claim 2, wherein the touch sensing electrodes extend along a second direction perpendicular to a first direction, the first direction is an extending direction of data lines on an array substrate, and the second direction is an extending direction of gate lines on the array substrate.

9. The in-cell touch display panel claimed as claim 2, further comprising an electrode protective layer disposed on the first touch driving electrodes and the second touch driving electrodes,

wherein the electrode protective layer is produced in a same layer as a pixel electrode layer of the array substrate, and is not connected to the pixel electrode layer.

10. The in-cell touch display panel claimed as claim 7, wherein the plurality of the first touch driving electrodes are arranged side by side, and the plurality of the first touch driving electrodes have the same shape and size.

11. The in-cell touch display panel claimed as claim 7, wherein a length or width of each of the first touch driving electrodes is in the range from 4 mm to 6 mm.

12. The in-cell touch display panel claimed as claim 7, wherein along a second direction perpendicular to the first direction, and a spacing between two of the first touch driving electrodes that are adjacent is in the range from 4 μ

m to 8 μ

m, and corresponds to a position of the black matrix of the color filter substrate.

13. The in-cell touch display panel claimed as claim 7, wherein the second touch driving electrodes are arranged side by side, and aligned with the first touch driving electrodes in the first direction, and the second touch driving electrodes are the same in shape and size.

14. The in-cell touch display panel claimed as claim 7, wherein a length or width of each of the second touch driving electrodes is in the range from 4 mm to 6 mm.

15. The in-cell touch display panel claimed as claim 7, wherein along a second direction perpendicular to the first direction, and a spacing between two of the second touch driving electrodes that are adjacent is in the range from 4 μ

m to 8 μ

m, and corresponds to position of the black matrix of the color filter substrate.

16. The in-cell touch display panel claimed as claim 7, wherein along the first direction, the first touch driving electrodes and the second touch driving electrodes in a same row are electrically connected by at least one touch driving signal line.

17. The in-cell touch display panel claimed as claim 7, wherein the touch driving signal line is produced in a same layer as the first touch driving electrodes and the second touch driving electrodes.

18. The in-cell touch display panel claimed as claim 7, wherein the touch sensing electrodes extend along a second direction perpendicular to a first direction, the first direction is an extending direction of data lines on an array substrate, and the second direction is an extending direction of gate lines on the array substrate.

19. The in-cell touch display panel claimed as claim 7, further comprising an electrode protective layer disposed on the first touch driving electrodes and the second touch driving electrodes,

wherein the electrode protective layer is produced in a same layer as a pixel electrode layer of the array substrate, and is not connected to the pixel electrode layer.