Touch screen, manufacturing method thereof, and display device

Patent metadata

Field	Value
Publication number	US-11112923-B2
Application number	US-202016831994-A
Country	US
Kind code	B2
Filing date	Mar 27, 2020
Priority date	Nov 7, 2019
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

Abstract

A touch screen, a manufacturing method thereof, and a display device. The touch screen includes: a plurality of mutually independent touch detection regions. Each touch detection region includes a plurality of strip transparent electrodes arranged along a first direction and extending along a second direction, and a plurality of mesh electrodes arranged along the second direction and extending along the first direction. The strip transparent electrodes and the mesh electrodes are insulated from each other, and the second direction is intersected with the first direction. Strip ground electrodes extending along the second direction exist between every two adjacent touch detection regions arranged along the first direction, and the strip ground electrodes and the strip transparent electrodes are disposed on the same layer.

First claim

The invention claimed is:

1. A touch screen, comprising:
a plurality of mutually independent touch detection regions, wherein
each of the touch detection regions comprises:
a plurality of strip transparent electrodes arranged in a first layer along a first direction and extending along a second direction;
a plurality of mesh electrodes arranged in a second layer along the second direction and extending along the first direction; wherein the strip transparent electrodes and the mesh electrodes are insulated from each other, the second direction is intersected with the first direction, and the second layer is arranged on the first layer; and
a plurality of strip redundant electrodes each located between every two adjacent strip transparent electrodes; wherein the plurality of strip redundant electrodes are electrically connected with the plurality of mesh electrodes in a one-to-one corresponding manner;
two strip ground electrodes, extending along the second direction, arranged in the first layer along the first direction, and located at two edges parallel to the second direction of the touch detection region, respectively; wherein the two strip ground electrodes are grounded;
wherein projections of the strip transparent electrodes, the strip redundant electrodes, and the two strip ground electrodes on the touch detection region are overlapped with a projection of the mesh electrodes on the touch detection region.

2. The touch screen according to claim 1 , wherein the touch detection regions respectively further comprise a first insulating layer disposed between a layer where the strip transparent electrodes are placed and a layer where the mesh electrodes are placed; the first insulating layer comprises a hole structure opposite to the strip redundant electrodes; the mesh electrodes respectively overlap with the corresponding strip redundant electrodes through the hole structure; and an orthographic projection of any one of the strip redundant electrodes on the touch screen is greater than or equal to an orthographic projection of the hole structure on the touch screen.

3. The touch screen according to claim 1 , wherein the strip redundant electrodes and the strip transparent electrodes have connection terminals on same sides.

4. The touch screen according to claim 1 , wherein the touch detection region respectively further comprise a mesh redundant electrode located between every two adjacent mesh electrodes.

5. The touch screen according to claim 1 , wherein the touch detection regions respectively further comprise a second insulating layer disposed on a side, away from a layer where the strip transparent electrodes are placed, of a layer where the mesh electrodes are placed.

6. The touch screen according to claim 1 , wherein a shape of the mesh electrodes is rhombic, or square, or hexagonal.

7. A display device, comprising the touch screen according to claim 1 .

8. The display device according to claim 7 , wherein the touch detection regions respectively further comprise a first insulating layer disposed between a layer where the strip transparent electrodes are placed and a layer where the mesh electrodes are placed; the first insulating layer comprises a hole structure opposite to the strip redundant electrodes; the mesh electrodes respectively overlap with the corresponding strip redundant electrodes through the hole structure; and an orthographic projection of any one of the strip redundant electrodes on the touch screen is greater than or equal to an orthographic projection of the hole structure on the touch screen.

9. The display device according to claim 7 , wherein the strip redundant electrodes and the strip transparent electrodes have connection terminals on same sides.

10. The display device according to claim 7 , wherein the touch detection region respectively further comprise a mesh redundant electrode located between every two adjacent mesh electrodes.

11. The display device according to claim 7 , wherein the touch detection regions respectively further comprise a second insulating layer disposed on a side, away from a layer where the strip transparent electrodes are placed, of a layer where the mesh electrodes are placed.

12. The display device according to claim 7 , wherein a shape of the mesh electrodes is rhombic, or square, or hexagonal.

13. The display device according to claim 7 , wherein an orthographic projection of the touch detection region on the touch screen is slightly larger than an orthographic projection of a display region on the touch screen.

14. A manufacturing method of a touch screen, comprising:
dividing the touch screen into a plurality of mutually independent touch detection regions;
sequentially forming a plurality of strip transparent electrodes arranged in a first layer along a first direction and extending along a second direction in each of the touch detection regions, and forming two strip ground electrodes, extending along the second direction, arranged in the first layer along the first direction at two edges parallel to the second direction of each of the touch detection region, respectively; wherein the second direction is intersected with the first direction; and
forming a plurality of mesh electrodes arranged in a second layer along the second direction and extending along the first direction in the touch detection regions, wherein the strip transparent electrodes and the mesh electrodes are insulated from each other, and the second layer is arranged on the first layer;
forming a plurality of strip redundant electrodes each located between every two adjacent strip transparent electrodes; wherein the plurality of strip redundant electrodes are electrically connected with the plurality of mesh electrodes in a one-to-one corresponding manner;
wherein projections of the strip transparent electrodes, the strip redundant electrodes, and the two strip ground electrodes on the touch detection region are overlapped with a projection of the mesh electrodes on the touch detection region.

15. The method according to claim 14 , wherein when forming the plurality of mesh electrodes arranged along the second direction and extending along the first direction in the touch detection regions, the method further comprises:
forming a mesh redundant electrode extending along the first direction between every two adjacent mesh electrodes.

Assignees

• Hefei Xinsheng Optoelectronics Technology Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Zhang Chuanwen
• Dong Zhao
• Fan Wenjin
• Li Bisheng
• Xu Jiawei
• Li Baoran

Classifications

• G06F3/0448 Primary

  Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality · CPC title

• G06F3/0445 Primary

  using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer · CPC title

• G06F2203/04103

  Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices · CPC title

• G06F3/04166

  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 title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title