Touch substrate and display device

Patent metadata

Field	Value
Publication number	US-11875007-B2
Application number	US-202017263289-A
Country	US
Kind code	B2
Filing date	Jul 23, 2020
Priority date	Nov 15, 2019
Publication date	Jan 16, 2024
Grant date	Jan 16, 2024

Abstract

The present disclosure discloses a touch substrate and a display device. The touch substrate includes a base substrate and further includes a touch driving electrode, a touch sensing electrode and a grounding electrode which are located on the base substrate and insulated from one another. An orthographic projection of the grounding electrode on the base substrate and orthographic projections of the touch driving electrode and the touch sensing electrode on the base substrate have a non-overlapping region with each other.

First claim

What is claimed is:

1. A touch substrate, comprising:
a base substrate, a touch driving electrode, a touch sensing electrode and a grounding electrode and a floating electrode;
wherein the touch driving electrode, the touch sensing electrode and the grounding electrode are located on the base substrate and insulated from one another; wherein an orthographic projection of the grounding electrode on the base substrate and orthographic projections of the touch driving electrode and the touch sensing electrode on the base substrate have a non-overlapping region with each other;
the touch driving electrode comprises a plurality of driving electrode blocks arranged in array, and the touch sensing electrode comprises a plurality of sensing electrode blocks arranged in array; and the touch driving electrode further comprises a plurality of first bridging sub electrodes configured to electrically connect the adjacent driving electrode blocks and arranged in a layer different from a layer in which the plurality of driving electrode blocks is arranged, or the touch sensing electrode further comprises a plurality of second bridging sub electrodes configured to electrically connect the adjacent sensing electrode blocks and arranged in a layer different from a layer in which the plurality of sensing electrode blocks;
the floating electrode is located between the driving electrode blocks and the grounding electrode, and/or the floating electrode is located between the sensing electrode blocks and the grounding electrode; and
an orthographic projection of the floating electrode on the base substrate surrounds an orthographic projection of the grounding electrode on the base substrate; and the orthographic projections of the touch driving electrode and the touch sensing electrode on the base substrate are not located between the orthographic projection of the floating electrode on the base substrate and the orthographic projection of the grounding electrode on the base substrate.

2. The touch substrate according to claim 1 , further comprising: a grounding wire located on the base substrate, wherein the grounding wire is electrically connected with the grounding electrode.

3. The touch substrate according to claim 2 , wherein the grounding electrode is arranged on the same layer with the driving electrode blocks and the sensing electrode blocks.

4. The touch substrate according to claim 3 , wherein the floating electrode is arranged on the same layer with the driving electrode blocks and the sensing electrode blocks in an insulated mode.

5. The touch substrate according to claim 1 , wherein a shape of the floating electrode is the same as a shape of a border of the grounding electrode.

6. The touch substrate according to claim 4 , wherein the floating electrode is a strip electrode, and a long edge of the floating electrode is parallel to an adjacent side edge of the grounding electrode.

7. The touch substrate according to claim 3 , wherein the grounding wire is arranged on the same layer with the bridging sub electrodes.

8. The touch substrate according to claim 2 , wherein the grounding electrode is located on one side of the base substrate away from the driving electrode blocks and the sensing electrode blocks.

9. The touch substrate according to claim 8 , wherein the orthographic projection of the grounding electrode on the base substrate does not overlap with the orthographic projections of the touch driving electrode and the touch sensing electrode on the base substrate.

10. The touch substrate according to claim 9 , wherein the grounding wire is arranged on the same layer with the grounding electrode.

11. The touch substrate according to claim 1 , wherein a hollowed-out region exists in the driving electrode blocks and/or the sensing electrode blocks; and
an orthographic projection of the hollowed-out region on the base substrate and the orthographic projection of the grounding electrode on the base substrate have an overlapping region with each other.

12. The touch substrate according to claim 11 , wherein the hollowed-out region is located in a center region of the driving electrode blocks and/or the sensing electrode blocks.

13. The touch substrate according to claim 12 , wherein the grounding electrode is located in the hollowed-out region.

14. The touch substrate according to claim 1 , wherein an orthographic projection of a gap region between the driving electrode blocks and the sensing electrode blocks on the base substrate and the orthographic projection of the grounding electrode on the base substrate have an overlapping region with each other.

15. The touch substrate according to claim 14 , wherein the grounding electrode is located in the gap region.

16. The touch substrate according to claim 15 , wherein the grounding electrode is a long-strip-shaped electrode, and a long edge of the grounding electrode is parallel to adjacent edges of the driving electrode blocks and the sensing electrode blocks.

17. The touch substrate according to claim 1 , wherein an occupied area of the grounding electrode is 20%-40% of that of the driving electrode blocks and the sensing electrode blocks.

18. A display device, comprising the touch substrate according to claim 1 and a display panel; wherein
the touch substrate is attached to one side of a light emitting surface of the display panel, or, the touch substrate is embedded in the display panel.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Bo Zewen
• Xiang Dalin

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

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F3/04164

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

• G06F2203/04111

  Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate · CPC title

• G06F2203/04107

  Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds · CPC title