Touch substrate and method of producing the same, and touch panel and method of producing the same, and display device

Patent metadata

Field	Value
Publication number	US-10712845-B2
Application number	US-201815963063-A
Country	US
Kind code	B2
Filing date	Apr 25, 2018
Priority date	Aug 15, 2017
Publication date	Jul 14, 2020
Grant date	Jul 14, 2020

Abstract

The present disclosure relates to a touch substrate and a method of producing the same, and a touch panel and a method of producing the same, and a display device. In an embodiment, a method of producing a touch substrate comprises steps of: forming a flexible film sheet with a metal wiring pattern, the metal wiring pattern comprising metal wirings and metal bonding electrodes connected to the metal wirings respectively; forming a glass substrate on which a touch electrode structure and touch bonding electrodes in an electrical connection with the touch electrode structure are formed, both a sheet resistance of the touch electrode structure and a sheet resistance of the touch bonding electrodes ranging from 12 Ω/□ to 70 Ω/□; and aligning and bonding the flexible film sheet with the glass substrate.

First claim

What is claimed is:

1. A method of producing a touch substrate, comprising steps of:
forming at least one flexible film sheet with a metal wiring pattern, the metal wiring pattern comprising metal wirings and metal bonding electrodes connected to the metal wirings respectively;
forming at least one glass substrate on which a touch electrode structure and touch bonding electrodes in electrical connection with the touch electrode structure are formed, both a sheet resistance of the touch electrode structure and a sheet resistance of the touch bonding electrodes ranging from 12 Ω/□ to 70 Ω/□; and
aligning and bonding the at least one flexible film sheet with the at least one glass substrate,
wherein the touch electrode structure comprises a plurality of first electrodes arranged in parallel with each other and a plurality of second electrodes arranged in parallel with each other, the plurality of first electrodes intersecting with the plurality of second electrodes.

2. The method of claim 1 , wherein the step of forming the at least one flexible film sheet with the metal wiring pattern comprises steps of:
bonding a flexible film onto a glass motherboard with an adhesive;
dividing the flexible film into at least one first region;
forming the metal wiring pattern in each first region;
stripping the flexible film from the adhesive; and
cutting the flexible film along a boundary of the at least one first region to form the at least one flexible film sheet with the metal wiring pattern.

3. The method of claim 2 , wherein the step of forming the at least one glass substrate on which the touch electrode structure and touch bonding electrodes in electrical connection with the touch electrode structure are formed comprises steps of:
recovering the glass motherboard and removing the adhesive remaining on the glass motherboard;
dividing the glass motherboard into at least one second region;
forming the touch electrode structure and the touch bonding electrodes in each second region; and
cutting the glass motherboard along boundary of the at least one second region to form the at least one glass substrate on which the touch electrode structure and the touch bonding electrodes in electrical connection with the touch electrode structure are formed.

4. The method of claim 3 , wherein the step of forming the touch electrode structure and the touch bonding electrodes in each second region comprises steps of:
forming a plurality of first electrodes arranged in parallel with each other, a plurality of second electrodes arranged in parallel with each other, a plurality of first touch bonding electrodes connected to the plurality of first electrodes respectively, and a plurality of second touch bonding electrodes connected to the plurality of second electrodes respectively, the plurality of first electrodes intersecting with the plurality of second electrodes, each of the first electrodes comprising a plurality of first sub-electrodes connected electrically to each other successively, each of the second electrodes comprising a plurality of second sub-electrodes separated from each other by the first electrodes;
forming a protective layer which covers at least intersected regions of the first electrodes and the second electrodes; and
forming a plurality of bridging electrodes on the protective layer, each of the bridging electrodes being electrically connected to two adjacent second sub- electrodes of one second electrode.

5. The method of claim 4 , wherein the protective layer covers the entire second region, and the method further comprises a step of:
etching the protective layer to form via holes which expose a part of each of the second sub-electrodes and expose the plurality of touch bonding electrodes, the bridging electrodes being electrically connected to the second sub- electrodes through the via holes.

6. The method of claim 3 , wherein before the step of forming the touch electrode structure and the touch bonding electrodes in each second region, the method further comprises a step of:
forming a pattern blanking layer covering each second region on the glass motherboard.

7. The method of claim 1 , wherein the step of aligning and bonding the at least one flexible film sheet with the at least one glass substrate comprises steps of:
bonding an anisotropic conductive adhesive onto a region of the at least one glass substrate where the touch bonding electrodes are formed or a region of the at least one flexible film sheet where the metal bonding electrodes are formed;
aligning the at least one flexible film sheet with the at least one glass substrate to align the touch bonding electrodes with the metal bonding electrodes; and
pressing the at least one flexible film sheet against the at least one glass substrate so as to electrically connect the metal bonding electrodes with the touch bonding electrodes through the anisotropic conductive adhesive.

8. A method of producing a touch panel, wherein the touch panel comprises a touch substrate and a cover plate on the touch substrate, and the producing method comprises steps of:
producing the touch substrate by using the producing method of claim 1 , wherein the touch substrate is characterized by a profile of the at least one flexible film sheet being larger than a profile of the at least one glass substrate, the at least one flexible film sheet further comprising at least one edge region which is not bonded with a surface of the at least one glass substrate facing towards the at least one flexible film sheet; and
pressing the cover plate with a curved edge against a surface of the at least one flexible film sheet facing away from the at least one glass substrate, so that the edge region of the at least one flexible film sheet is curved towards the at least one glass substrate and conforms to the curved edge of the cover plate.

9. The method of claim 8 , wherein before the step of pressing the cover plate with the curved edge against the surface of the at least one flexible film sheet facing away from the at least one glass substrate, the method further comprises a step of:
forming at least one of a polarizer layer and an ink layer on the surface of the at least one flexible film sheet facing away from the at least one glass substrate.

10. The method of claim 8 , wherein the edge region of the at least one flexible film sheet is at least positioned at two opposite sides of the at least one glass substrate.

11. The method of claim 8 , wherein the metal wirings are at least positioned in the edge region of the at least one flexible film sheet.

Assignees

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

Inventors

• Wang Jing
• Zhu Shuncheng
• Li Dong
• Xu Zouming
• Xie Xiaodong
• He Min
• Tian Jian
• Zheng Qitao
• Li Yaying

Classifications

• G06F3/0443

  using a single layer of sensing electrodes · CPC title

• G06F3/04164

  Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads · CPC title

• G06F3/0446 Primary

  using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes · CPC title

• G06F3/041 Primary

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title

• G06F2203/04103

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