In-cell touch panel and display device

• US 10,067,614 B2
• Filed: 09/20/2014
• Issued: 09/04/2018
• 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: Wang, Chunlei, Xue, Hailin, Wang, Haisheng, Liu, Yingming
• Primary Examiner(s): PARDO, THUY N
• Application Number:
  US14/443,594
• Publication Number:
  US 20160048233A1
• Time in Patent Office: 1,445 Days
• Field of Search: 345173, 345174, 345156
• CPC Class Codes: G06F 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• 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: G06F 3/0448 Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality

Abstract

An in-cell touch panel and a display device are disclosed. A plurality of mutually independent self-capacitance electrodes arranged in the same layer are disposed in the touch panel in accordance with the self-capacitance principle. A touch detection chip can determine the touch position by the detection of the capacitance variation of the self-capacitance electrode. Compared with the case that body capacitance only acts on the projected capacitance in mutual capacitance, the in-cell touch panel can effectively improve the signal-to-noise ratio of touch and hence can improve the accuracy of touch sensing.

Claims

1. An in-cell touch panel, comprising:

a first substrate and a second substrate arranged opposite to each other, a common electrode layer disposed on one side of the first substrate facing the second substrate, and a touch detection chip, wherein

the common electrode layer includes a plurality of mutually independent self-capacitance electrodes, which are disposed in a same layer and arranged in matrix having rows and columns, and a plurality of leads configured to connect the self-capacitance electrodes to the touch detection chip; and

the touch detection chip is configured to apply common electrode signals to the self-capacitance electrodes in a display period and determine the touch position by applying driving signals to the self-capacitance electrodes and detecting the self-capacitance variation of the self-capacitance electrode in a touch period;

each lead is electrically connected with two mutually separated self-capacitance electrodes, and the self-capacitance electrodes electrically connected with different leads do not overlapped with each other.

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

a black matrix (BM) layer disposed on one side of the first substrate facing the second substrate or one side of the second substrate facing the first substrate, wherein

an orthographic projection of a dividing gap between two adjacent self-capacitance electrodes on the second substrate is disposed in an area provided with a pattern of the BM layer; and

orthographic projections of patterns of the leads on the second substrate are all disposed in the area provided with the pattern of the BM layer.

3. The in-cell touch panel according to claim 2, further comprising:

peripheral wirings electrically connected with connecting terminals of the touch detection chip,

wherein the peripheral wirings and the connecting terminals of the touch detection chip are disposed on a bezel on one side of the second substrate facing the first substrate; and

the self-capacitance electrodes are electrically connected with corresponding peripheral wirings through sealant after being connected to the bezel of the in-cell touch panel through the leads.

4. The in-cell touch panel according to claim 3, wherein the bezel of the in-cell touch panel is rectangular;

and the self-capacitance electrodes are connected to a long side of the bezel through the leads along a short-side direction of the bezel.

5. The in-cell touch panel according to claim 3, wherein the bezel of the in-cell touch panel has four sides;

and the self-capacitance electrodes are connected to a nearest side through corresponding leads where the leads do not intersect with each other.

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

7. The in-cell touch panel according to claim 6, wherein both the opposite sides of the two adjacent self-capacitance electrodes, being bend lines, have stepped structures;

and the two stepped structures have consistent shape match with each other.

8. The in-cell touch panel according to claim 6, wherein both the opposite sides of the two adjacent self-capacitance electrodes, being bend lines, have concave-convex structures;

and the two concave-convex structures have consistent shape match with each other.

9. The in-cell touch panel according to claim 1, further comprising:

peripheral wirings electrically connected with connecting terminals of the touch detection chip,

wherein the peripheral wirings and the connecting terminals of the touch detection chip are disposed on a bezel on one side of the second substrate facing the first substrate; and

the self-capacitance electrodes are electrically connected with corresponding peripheral wirings through sealant after being connected to the bezel of the in-cell touch panel through the leads.

10. The in-cell touch panel according to claim 9, wherein the bezel of the in-cell touch panel is rectangular;

and the self-capacitance electrodes are connected to a long side of the bezel through the leads along a short-side direction of the bezel.

11. The in-cell touch panel according to claim 9, wherein the bezel of the in-cell touch panel has four sides;

and the self-capacitance electrodes are connected to a nearest side through corresponding leads where the leads do not intersect with each other.

12. The in-cell touch panel according to claim 1, wherein both opposite sides of two adjacent self-capacitance electrodes are bend lines located in a plane parallel to the common electrode layer.

13. The in-cell touch panel according to claim 12, wherein both the opposite sides of the two adjacent self-capacitance electrodes, being bend lines, have stepped structures;

and the two stepped structures have consistent shape match with each other.

14. The in-cell touch panel according to claim 12, wherein both the opposite sides of the two adjacent self-capacitance electrodes, being bend lines, have concave-convex structures;

and the two concave-convex structures have consistent shape match with each other.

15. A display device, comprising the in-cell touch panel according to claim 1.