Touch screen including electrode with finger-shaped branches and display apparatus

Patent metadata

Field	Value
Publication number	US-10838566-B2
Application number	US-201916391170-A
Country	US
Kind code	B2
Filing date	Apr 22, 2019
Priority date	Sep 5, 2018
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

Embodiments of the present disclosure provide a touch screen and a display apparatus having the touch screen. The touch screen includes: first electrodes, second electrodes and bridging structures. Each first electrode includes: a first electrode body extending in a first direction; and first finger-shaped portions extending from the first electrode body in a second direction crossing the first direction. The second electrodes cross the first electrodes at cross positions, and each second electrode includes: a second electrode body extending in the second direction; finger-shaped branches extending from the second electrode body in the first direction; and at least one second finger-shaped portion extending in the second direction from each finger-shaped branch. The first finger-shaped portions and the second finger-shaped portions form an interdigital structure.

First claim

What is claimed is:

1. A touch screen comprising:
a plurality of first electrodes each comprising: a first electrode body extending in a first direction; and a plurality of first finger-shaped portions extending from the first electrode body in a second direction crossing the first direction;
a plurality of second electrodes crossing the plurality of first electrodes at a plurality of cross positions, wherein each of the plurality of second electrodes comprises: a second electrode body extending in the second direction; a plurality of finger-shaped branches extending from the second electrode body in the first direction; and at least one second finger-shaped portion extending in the second direction from each of the plurality of finger-shaped branches, and wherein the first finger-shaped portions of the plurality of first electrodes and the second finger-shaped portions of the plurality of second electrodes form an interdigital structure; and
a plurality of bridging structures, wherein each of the plurality of second electrodes is continuous at the cross positions, and each of the plurality of first electrodes comprises a plurality of first electrode segments which are separate from one another at the cross positions and which are connected with one another through the bridging structures; or wherein each of the plurality of first electrodes is continuous at the cross positions, and each of the plurality of second electrodes comprises a plurality of second electrode segments which are separate from one another at the cross positions and which are connected with one another through the bridging structures,
wherein every two adjacent ones of the plurality of first electrodes are a set of first electrodes, every two adjacent ones of the plurality of second electrodes are a set of second electrodes, and a crossing of the set of first electrodes and the set of second electrodes is a touch unit, and
wherein a first finger-shaped branch of one of every two adjacent ones of the plurality of second electrodes and a second finger-shaped branch, adjacent to the first finger-shaped branch in the first direction, of the other of the two adjacent second electrodes constitute a pair of connectable finger-shaped branches, and in each touch unit, at least one pair of connectable finger-shaped branches from each of the two adjacent second electrodes are directly electrically connected to each other.

2. The touch screen of claim 1 , wherein:
the plurality of first electrodes are drive electrodes, and the plurality of second electrodes are sense electrodes; or
the plurality of second electrodes are drive electrodes, and the plurality of first electrodes are sense electrodes.

3. The touch screen of claim 1 , further comprising:
a dummy electrode disposed between the plurality of first electrodes and the plurality of second electrodes.

4. The touch screen of claim 3 , wherein:
the plurality of first electrodes, the plurality of second electrodes, and the dummy electrode each have a mesh structure.

5. The touch screen of claim 4 , wherein:
the first finger-shaped portions of the plurality of first electrodes, and the second finger-shaped portions of the plurality of second electrodes each have a width greater than two meshes; and
the dummy electrode has a width greater than one mesh.

6. The touch screen of claim 4 , wherein:
in the mesh structure, each mesh of a plurality of meshes corresponds to a single sub-pixel or a group of sub-pixels, and an orthogonal projection of the single sub-pixel or the group of sub-pixels on a plane where the meshes are located is within a corresponding one of the meshes.

7. The touch screen of claim 6 , wherein:
the meshes in the mesh structure comprise hexagonal meshes.

8. The touch screen of claim 7 , wherein:
each of the plurality of bridging structures comprises a zigzag bridge connection extending along the hexagonal meshes.

9. The touch screen of claim 1 , wherein:
there is a space between the first finger-shaped portions of the plurality of first electrodes and the second finger-shaped portions of the plurality of second electrodes in a plane where the plurality of first electrodes and the plurality of second electrodes are located.

10. The touch screen of claim 1 , wherein:
the first electrode bodies of the plurality of first electrodes and the second electrode bodies of the plurality of second electrodes cross each other at the plurality of cross positions; and
the second electrode body of each of the plurality of second electrodes is continuous at the cross positions, and the first electrode body of each of the plurality of first electrodes comprises a plurality of first electrode body segments which are separate from one another at the cross positions and which are connected with one another through the bridging structures; or the first electrode body of each of the plurality of first electrodes is continuous at the cross positions, and the second electrode body of each of the plurality of second electrodes comprises a plurality of second electrode body segments which are separate from one another at the cross positions and which are connected with one another through the bridging structures.

11. The touch screen of claim 1 , wherein:
in each of the plurality of first electrodes, the plurality of first finger-shaped portions extend towards opposite directions in the second direction from both sides, in the second direction, of the first electrode body respectively; and
in each of the plurality of second electrodes, the at least one second finger-shaped portion extending in the second direction from one side, in the second direction, of a 2n-1th one of the plurality of finger-shaped branches, and the at least one second finger-shaped portion extending in the second direction from one side, in the second direction, of a 2nth one of the plurality of finger-shaped branches extend towards each other, and n is a positive integer.

12. The touch screen of claim 11 , wherein:
in each of the plurality of second electrodes, each of the plurality of finger-shaped branches comprises two finger-shaped branch segments which extend away from each other in the first direction from both sides, in the first direction, of the second electrode body.

13. The touch screen of claim 12 , wherein:
in each of the plurality of second electrodes, the two finger-shaped branch segments of each of the plurality of finger-shaped branches are disposed symmetrically with respect to the second electrode body.

14. The touch screen of claim 11 , wherein:
assuming that the at least one second finger-shaped portion, extending in the second direction from the one side, in the second direction, of the 2n-1th one of the plurality of finger-shaped branches of each of the plurality of second electrodes, is a 2n-1th finger-shaped portion set, and assuming that the at least one second finger-shaped portion, extending in the second direction from the one side, in the second direction, of the 2nth one of the plurality of finger-shaped branches of the each of the plurality of second electrodes, is a 2nth finger-shaped portion set, one of the first electrode bodies of the plurality of first electrodes is located between the 2n-1th finger-shaped portion set and the 2nth finger-shaped portion set of each of the plurality of second electrodes in the second direction.

15. The touch screen of claim 1 , wherein:
the first electrode bodies of the plurality of first electrodes and the finger-shaped branches of each of the plurality of second electrodes are alternately arranged in the second direction.

16.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Kuo Tawei

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

• G09F9/33

  being semiconductor devices, e.g. diodes · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F3/041 Primary

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