Touch substrate, driving method thereof and display device

Patent metadata

Field	Value
Publication number	US-11561640-B2
Application number	US-202017057189-A
Country	US
Kind code	B2
Filing date	Jan 20, 2020
Priority date	Feb 22, 2019
Publication date	Jan 24, 2023
Grant date	Jan 24, 2023

Abstract

There is provided a touch substrate including a base substrate and at least one touch unit on the base substrate. Each touch unit includes capacitive touch electrodes including a first electrode and a second electrode and electromagnetic touch electrodes including a third electrode and a fourth electrode. An insulating layer is between the first and second electrodes. A resistance of a material of each of the electromagnetic touch electrodes is changed when a magnetic field where the electromagnetic touch electrode is located is changed. The insulating layer further extends between the third and fourth electrodes. The third and first electrodes are spaced apart from each other and are side by side on a same side of the base substrate, and the fourth and second electrodes are spaced apart from each other and are side by side on a side of the insulating layer distal to the base substrate.

First claim

What is claimed is:

1. A touch substrate, comprising a base substrate and at least one touch unit on the base substrate, wherein
each of the at least one touch unit comprises capacitive touch electrodes and electromagnetic touch electrodes;
the capacitive touch electrodes comprise a first electrode and a second electrode, and an insulating layer is between the first electrode and the second electrode;
a resistance of a material of each of the electromagnetic touch electrodes is changed when a magnetic field where the electromagnetic touch electrode is located is changed, the electromagnetic touch electrodes comprise a third electrode and a fourth electrode, and the insulating layer further extends between the third electrode and the fourth electrode;
the third electrode and the first electrode are spaced apart from each other and are side by side on a same side of the base substrate, and the fourth electrode and the second electrode are spaced apart from each other and are side by side on a side of the insulating layer distal to the base substrate;
wherein the at least one touch unit comprises a plurality of touch units in an array, and each of the plurality of touch units is configured to correspond to at least one pixel of a display panel; and
wherein the second electrodes of the touch units in each row parallel to the first direction are connected to each other to form a driving electrode, and the first electrodes of the touch units in each column parallel to the second direction are connected to each other to form a sensing electrode.

2. The touch substrate according to claim 1 , wherein the third electrode and the fourth electrode are at staggered positions, respectively, and the first electrode and the second electrode are at staggered positions, respectively.

3. The touch substrate according to claim 2 , wherein in each of the at least one touch unit, the third electrode comprises a first portion, a second portion and a third portion spaced apart from each other along a first direction, the second portion comprises a plurality of sub-portions spaced apart from each other along a second direction, the first electrode is between the first portion, the second portion and the third portion and has a plurality of openings for housing the plurality of sub-portions, respectively, and the first direction is perpendicular to the second direction.

4. The touch substrate according to claim 3 , wherein in each of the at least one touch unit, the fourth electrode comprises a plurality of fourth portions spaced apart from each other along the first direction and a plurality of fifth portions spaced apart from each other along the second direction, and the second electrode is between the plurality of fourth portions and between the plurality of fifth portions.

5. The touch substrate according to claim 4 , wherein each of the first electrode, the second electrode, the third electrode and the fourth electrode is distributed in a grid.

6. The touch substrate according to claim 5 , wherein the grid formed by the first electrode, the second electrode, the third electrode, and the fourth electrode comprises meshes, shapes of the meshes are identical to each other, and areas of the meshes are equal to each other.

7. The touch substrate according to claim 6 , wherein each mesh is diamond-shaped or rectangular.

8. The touch substrate according to claim 4 , wherein the first electrode and the third electrode form a grid, and meshes of the grid formed by the first electrode and the third electrode have shapes identical to each other and areas equal to each other; and
the second electrode and the fourth electrode form a grid, and meshes of the grid formed by the second electrode and the fourth electrode have shapes identical to each other and areas equal to each other.

9. The touch substrate according to claim 8 , wherein the shape and the area of each of the meshes of the grid formed by the first and third electrodes are equal to the shape and the area of each of the meshes of the grid formed by the second and fourth electrodes, respectively.

10. The touch substrate according to claim 9 , wherein the grid formed by the first electrode and the third electrode and the grid formed by the second electrode and the fourth electrode are in different layers, respectively; and
an area of each mesh of a grid formed by the first electrode, the second electrode, the third electrode, and the fourth electrode is equal to half an area of each mesh of the grid formed by the first electrode and the third electrode, or equal to half an area of each mesh of the grid formed by the second electrode and the fourth electrode.

11. The touch substrate according to claim 1 , further comprising a plurality of first signal electrodes and a plurality of second signal electrodes, wherein each of the plurality of first signal electrodes corresponds to and is connected to the sensing electrode for transmitting a capacitive touch sensing signal and a first electromagnetic touch signal, and each of the plurality of second signal electrodes corresponds to and is connected to the driving electrode for transmitting a capacitive touch driving signal and a second electromagnetic touch signal.

12. The touch substrate according to claim 11 , further comprising a black matrix outside each of the touch units and on a surface of the insulating layer proximal to the base substrate, wherein orthographic projections of the first and second signal electrodes on the base substrate are within an orthographic projection of the black matrix on the base substrate.

13. The touch substrate according to claim 1 , wherein the material of each of the electromagnetic touch electrodes is a giant magnetoresistance material.

14. The touch substrate according to claim 1 , wherein a material of each of the capacitive touch electrodes is a conductive material of metal.

15. The touch substrate according to claim 1 , further comprising a protection layer on a side of each of the at least one touch unit distal to the base substrate for protecting the at least one touch unit.

16. The touch substrate according to claim 15 , wherein a material of each of the protection layer and the insulating layer is a transparent insulating material.

17. A display device, comprising a display panel and the touch substrate according to claim 1 , wherein the touch substrate is on a display side of the display panel.

18. A method for driving a touch substrate, wherein the touch substrate is the touch substrate according to claim 1 , and the method comprises driving the capacitive touch electrodes and the electromagnetic touch electrodes of the touch substrate in a time-sharing manner.

Assignees

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

Inventors

• Xu Jiawei
• Li Bisheng
• Xie Taofeng
• Fan Wenjin

Classifications

• G06F3/0443

  using a single layer of sensing electrodes · CPC title

• G06F2203/04112

  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 title

• G06F3/0416 Primary

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/046

  by electromagnetic means · 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