Display panel and display apparatus with additional electrode layer for improving mutual capacitance variation

1. A display panel, comprising:

a display substrate; and

a touch electrode layer, which is arranged on a light outgoing side of the display substrate, and comprises at least one first electrode and at least one second electrode, which intersect with each other and are insulated from each other;

wherein the display panel further comprises:

an additional electrode layer, which is arranged in a layer different from the touch electrode layer and comprises at least one first additional electrode; wherein an orthographic projection of the at least one first additional electrode on the display substrate at least partially overlaps an orthographic projection of the at least one first electrode on the display substrate; and

an insulating layer, which is arranged between the additional electrode layer and the touch electrode layer; wherein the at least one first additional electrode is connected to the at least one first electrode through at least one first via in the insulating layer;

the additional electrode layer further comprises at least one second additional electrode, which is insulated from the at least one first additional electrode; and

an orthographic projection of the at least one second additional electrode on the display substrate at least partially overlaps the orthographic projection of the at least one second electrode on the display substrate, and the at least one second additional electrode is connected to the at least one second electrode through at least one second via in the insulating layer; and

the orthographic projection of an edge of each first electrode of the at least one first electrode, close to an adjacent second electrode of this first electrode, on the display substrate comprises a first edge region, and the orthographic projection of a first addition electrode of the at least one first additional electrode, corresponding to this first electrode, on the display substrate overlaps the first edge region; and

the orthographic projection of an edge of each second electrode of the at least one second electrode, close to an adjacent first electrode of this second electrode, on the display substrate comprises a second edge region, and the orthographic projection of a second additional electrode of the at least one second additional electrode, corresponding to this second electrode, on the display substrate overlaps the second edge region; and

the additional electrode layer further comprises at least one bridge portion; and

the at least one bridge portion is connected to the at least one first additional electrode; the at least one first electrode comprises two first electrode blocks at both sides of one of the at least one second electrode; the at least one bridge portion electrically connects the two first electrode blocks together through at least two third vias in the insulating layer;

or

the at least one bridge portion is connected to the at least one second additional electrode; the at least one second electrode comprises two second electrode blocks at both sides of one of the at least one first electrode; the at least one bridge portion electrically connects the two second electrode blocks together through at least two third vias in the insulating layer.

2. The display panel of claim 1 , wherein

the at least one first via comprises a plurality of first vias, and

orthographic projections of the plurality of first vias on the display substrate are uniformly distributed in an area where the orthographic projection of the at least one first additional electrode on the display substrate overlaps the orthographic projection of the at least one first electrode on the display substrate.

3. The display panel of claim 2 , wherein

the at least one second via comprises a plurality of second vias, and

orthographic projections of the plurality of second vias on the display substrate are uniformly distributed in an area where the orthographic projection of the at least one second additional electrode on the display substrate overlaps the orthographic projection of the at least one second electrode on the display substrate.

4. The display panel of claim 3 , wherein

the at least one first additional electrode comprises a plurality of first additional electrodes, and

orthographic projection of the plurality of first additional electrodes on the display substrate are distributed in a part or an entirety of the first edge region of the orthographic projection of the at least one first electrode on the display substrate.

5. The display panel of claim 4 , wherein

the at least one second additional electrode comprises a plurality of second additional electrodes, and

orthographic projection of the plurality of second additional electrodes on the display substrate are distributed on a part or an entirety of the second edge region the orthographic projection of the at least one second electrode on the display substrate.

6. The display panel of claim 5 , wherein

the orthographic projection of the at least one first additional electrode on the display substrate fully overlaps the orthographic projection of the at least one first electrode on the display substrate.

7. The display panel of claim 6 , wherein

the orthographic projection of the at least one second additional electrode on the display substrate fully overlaps the orthographic projection of the at least one second electrode on the display substrate.

8. The display panel of claim 7 , wherein

the touch electrode layer comprises a plurality of sub-units arranged in an array along a first direction and a second direction; and

each of the plurality of sub-units comprises at least one first electrode and at least one second electrode, which comprise a plurality of first inter-digital electrodes and a plurality of second inter-digital electrodes, respectively, extending along the first direction and alternately arranged in the second direction.

9. The display panel of claim 8 , wherein

for each of the plurality of sub-units, the additional electrode layer is provided with a corresponding bridge portion of the at least one bridge portion.

10. The display panel of claim 9 , wherein

the at least one first electrode and the at least one second electrode are mesh-shaped; the additional electrode layer is mesh-shaped.

11. The display panel of claim 10 , wherein

each of the at least one first electrode and the at least one second electrode comprises a titanium/aluminum/titanium laminated material.

12. The display panel of claim 11 , wherein

the additional electrode layer comprises a titanium/aluminum/titanium laminated material.

13. The display panel of claim 12 , wherein

the insulating layer comprises a silicon nitride material or a silicon oxide material.

14. The display panel of claim 13 , wherein

a mesh located at a boundary between the at least one first electrode and the at least one second electrode comprises a plurality of metal wires, any two adjacent of which have a fracture therebetween, such that the at least one first electrode and the at least one second electrode are electrically insulated from each other.

15. The display panel of claim 14 , further comprising at least one first floating electrode;

wherein the at least one first floating electrode and the touch electrode layer are in a same layer, and spaced apart from each other and insulated from each other; and

wherein the at least one first floating electrode is floated.

16. The display panel of claim 15 , further comprising at least one second floating electrode;

wherein the at least one second floating electrode and the additional electrode layer are in a same layer, and insulated from each other;

an orthographic projection of the at least one second floating electrode and the additional electrode layer on the display substrate overlaps an orthographic projection of the at least one first floating electrode and the touch electrode layer on the display substrate.

17. A display apparatus, comprising the display panel of claim 1 .

18. The display panel of claim 1 , wherein

the at least one second via comprises a plurality of second vias, and

orthographic projections of the plurality of second vias on the display substrate are uniformly distributed in an area where the orthographic projection of the at least one second additional electrode on the display substrate overlaps the orthographic projection of the at least one second electrode on the display substrate.

19. The display panel of claim 1 , wherein

the at least one first additional electrode comprises a plurality of first additional electrodes, and

orthographic projection of the plurality of first additional electrodes on the display substrate are distributed in a part or an entirety of the first edge region of the orthographic projection of the at least one first electrode on the display substrate.

20. The display panel of claim 1 , wherein

the at least one second additional electrode comprises a plurality of second additional electrodes, and

orthographic projection of the plurality of second additional electrodes on the display substrate are distributed on a part or an entirety of the second edge region the orthographic projection of the at least one second electrode on the display substrate.