In-cell touch panel and display device

• US 10,198,130 B2
• Filed: 09/26/2014
• Issued: 02/05/2019
• 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, Xue, Hailin, Wang, Haisheng, Liu, Hongjuan, Yang, Shengji, Zhao, Weijie, Ding, Xiaoliang
• Primary Examiner(s): Patel, Nitin
• Assistant Examiner(s): Stone, Robert M
• Application Number:
  US14/647,976
• Publication Number:
  US 20150378474A1
• Time in Patent Office: 1,593 Days
• 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 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G09G 3/00 Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes

Abstract

An in-cell touch panel and a display device are disclosed. The in-cell touch panel includes a top substrate and a bottom substrate disposed oppositely to each other, a common electrode layer disposed on a side of the bottom substrate that faces the top substrate and a touch sensing chip. The common electrode layer is partitioned into a plurality of independent self-capacitance electrodes and a plurality of wires for connecting the self-capacitance electrodes to the touch sensing chip. The touch sensing chip is configured to apply common electrode signals to self-capacitance electrodes in a display interval and determine touch positions by detecting capacitance value variation of self-capacitance electrodes in a touch interval. No additional layer is needed for the in-cell touch panel, thereby saving production costs and improving production efficiency.

Claims

1. An in-cell touch panel comprising a top substrate and a bottom substrate disposed oppositely to each other, a common electrode layer disposed on a side of the bottom substrate that faces the top substrate, and a touch sensing chip;

wherein,

the common electrode layer is partitioned into a plurality of independent self-capacitance electrodes and a plurality of wires for connecting the self-capacitance electrodes to the touch sensing chip; and

the touch sensing chip is configured to apply common electrode signals to self-capacitance electrodes in a display interval and determine touch positions by detecting capacitance value variation of self-capacitance electrodes in a touch interval;

wherein each of the wires is electrically connected with two of every other self-capacitance electrodes and self-capacitance electrodes electrically connected with different wires are not the same.

2. The in-cell touch panel of claim 1, further comprising:

a black matrix layer disposed on a side of the top substrate facing the bottom substrate or on a side of the bottom substrate facing the top substrate;

wherein orthogonal projections of partitioning gaps between two adjacent self-capacitance electrodes on the bottom substrate are all located in regions in which a pattern of the black matrix layer is located;

and

orthogonal projections of patterns of the wires on the bottom substrate are all within the regions in which the pattern of the black matrix layer is located.

3. The in-cell touch panel of claim 2, wherein opposite sides of adjacent two of the self-capacitance electrodes are both bend lines.

4. The in-cell touch panel of claim 3, wherein the opposite sides of adjacent two self-capacitance electrodes that are bend lines both have step-like structures that are consistent and match each other.

5. The in-cell touch panel of claim 3, wherein the opposite sides of adjacent two self-capacitance electrodes that are bend lines both have concave-convex structures that are consistent and match each other.

6. The in-cell touch panel of claim 2, wherein each of the wires is electrically connected with two of every other self-capacitance electrodes and self-capacitance electrodes electrically connected with different wires are not the same.

7. The in-cell touch panel of claim 2, further comprising:

periphery wirings electrically connected with connection terminals of the touch sensing chip;

wherein the periphery wirings and the connection terminals of the touch sensing chip are disposed at a margin frame on a side of the bottom substrate that faces the top substrate; and

the self-capacitance electrodes are connected to the margin frame of the in-cell touch panel by the wires and then electrically connected with corresponding periphery wirings.

8. The in-cell touch panel of claim 7, wherein the margin frame of the in-cell touch panel is of a rectangle shape, and the wires connect the self-capacitance electrodes to a long side of the margin frame in a short side direction of the margin frame.

9. The in-cell touch panel of claim 7, wherein the margin frame of the in-cell touch panel has four sides, and each of the self-capacitance electrodes are connected to a closest side via a corresponding one of the wires while the wires do not intersect each other.

10. The in-cell touch panel of claim 1, wherein opposite sides of adjacent two of the self-capacitance electrodes are both bend lines.

11. The in-cell touch panel of claim 1, wherein opposite sides of adjacent two of the self-capacitance electrodes are both bend lines;

wherein the opposite sides of adjacent two self-capacitance electrodes that are bend lines both have step-like structures that are consistent and match each other.

12. The in-cell touch panel of claim 1, wherein opposite sides of adjacent two of the self-capacitance electrodes are both bend lines;

wherein the opposite sides of adjacent two self-capacitance electrodes that are bend lines both have concave-convex structures that are consistent and match each other.

13. The in-cell touch panel of claim 1, further comprising:

periphery wirings electrically connected with connection terminals of the touch sensing chip;

wherein the periphery wirings and the connection terminals of the touch sensing chip are disposed at a margin frame on a side of the bottom substrate that faces the top substrate; and

the self-capacitance electrodes are connected to the margin frame of the in-cell touch panel by the wires and then electrically connected with corresponding periphery wirings.

14. The in-cell touch panel of claim 13, wherein the margin frame of the in-cell touch panel is of a rectangle shape, and the wires connect the self-capacitance electrodes to a long side of the margin frame in a short side direction of the margin frame.

15. The in-cell touch panel of claim 13, wherein the margin frame of the in-cell touch panel has four sides, and each of the self-capacitance electrodes are connected to a closest side via a corresponding one of the wires while the wires do not intersect each other.

16. The in-cell touch panel of claim 1, wherein opposite sides of adjacent two of the self-capacitance electrodes are both bend lines;

wherein each of the wires is electrically connected with two of every other self-capacitance electrodes and self-capacitance electrodes electrically connected with different wires are not the same.

17. The in-cell touch panel of claim 1, further comprising:

periphery wirings electrically connected with connection terminals of the touch sensing chip;

wherein opposite sides of adjacent two of the self-capacitance electrodes are both bend lines;

wherein the periphery wirings and the connection terminals of the touch sensing chip are disposed at a margin frame on a side of the bottom substrate that faces the top substrate; and

the self-capacitance electrodes are connected to the margin frame of the in-cell touch panel by the wires and then electrically connected with corresponding periphery wirings.

18. The in-cell touch panel of claim 1, further comprising:

periphery wirings electrically connected with connection terminals of the touch sensing chip;

wherein the periphery wirings and the connection terminals of the touch sensing chip are disposed at a margin frame on a side of the bottom substrate that faces the top substrate; and

the self-capacitance electrodes are connected to the margin frame of the in-cell touch panel by the wires and then electrically connected with corresponding periphery wirings.

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