Display panel and manufacturing method thereof and display device

1. A display panel, comprising:

a base substrate;

wherein the base substrate is provided with a plurality of bonding electrodes; and

a plurality of micro light emitting displays (Micro-LEDs) are disposed on a side of the plurality of bonding electrodes facing away from the base substrate; and the plurality of Micro-LEDs are electrically connected to the plurality of bonding electrodes in one-to-one correspondence; and on a plane parallel to a plane where the base substrate is located, along a direction from a center of the base substrate to an edge of the base substrate, a size of each bonding electrode of the plurality of bonding electrodes gradually increases and/or a distance between centers of adjacent two of the plurality of bonding electrodes gradually increases to enable each Micro-LED of the plurality of Micro-LEDs to be bonded with a corresponding bonding electrode.

2. The display panel according to claim 1 , wherein along the direction from the center of the base substrate to the edge of the base substrate, the size of the each bonding electrode gradually increases;

the plurality of bonding electrodes are arranged to form a matrix structure with rows along a first direction and columns along a second direction, and the first direction intersects the second direction;

along the first direction from the center of the base substrate to the edge of the base substrate, the size of the each bonding electrode gradually increases along the first direction; and

along the second direction from the center of the base substrate to the edge of the base substrate, the size of the each bonding electrode gradually increases along the second direction.

3. The display panel according to claim 2 , wherein a standard matrix structure comprising a plurality of standard bonding positions is defined on the plane where the base substrate is located; all of the plurality of standard bonding positions have a same size;

distances between centers of adjacent two of the plurality of standard bonding positions along the first direction are equal; and

distances between centers of adjacent two of the plurality of standard bonding positions along the second direction are equal; and

the matrix structure comprises bonding electrodes in one-to-one correspondence to the plurality of standard bonding positions; and a vertical projection of each of the plurality of bonding electrodes on the base substrate overlaps with a corresponding standard bonding position.

4. The display panel according to claim 2 , wherein a standard matrix structure comprising a plurality of standard bonding positions is defined on the plane where the base substrate is located; each of the plurality of standard bonding positions has a same size; a distance between centers of adjacent two of the plurality of standard bonding positions along the first direction is Dx; and a distance between centers of adjacent two of the plurality of standard bonding positions along the second direction is Dy;

the matrix structure comprises the plurality of bonding electrodes in one-to-one correspondence to the plurality of standard bonding positions; each of the plurality of bonding electrodes comprises a standard portion and a widened portion, and a vertical projection of the standard portion on the base substrate overlaps with a corresponding standard bonding position;

along the first direction from the center of the base substrate to the edge of the base substrate, a size of a widened portion of an n-th bonding electrode is Axn satisfying: Axn=k×Dxn, wherein k is a linear expansion coefficient of a transfer material for bonding the plurality of Micro-LEDs; and Dxn=n×Dx; and

along the second direction from the center of the base substrate to the edge of the base substrate, a size of a widened portion of the n-th bonding electrode is Ayn satisfying: Ayn=k×Dyn, wherein Dyn=n×Dy.

5. The display panel according to claim 4 , wherein

along the first direction from the center of the base substrate to the edge of the base substrate, a distance between centers of adjacent two of at least part of the plurality of bonding electrodes gradually increases; and

along the second direction from the center of the base substrate to the edge of the base substrate, a distance between centers of adjacent two of the at least part of the plurality of bonding electrodes gradually increases.

6. The display panel according to claim 1 , wherein along the direction from the center of the base substrate to the edge of the base substrate, the distance between the centers of the adjacent two of the plurality of bonding electrodes gradually increases;

the plurality of bonding electrodes are disposed in rows along a first direction and in columns along a second direction to form a matrix structure; and the first direction intersects the second direction;

along the first direction from the center of the base substrate to the edge of the base substrate, a distance between centers of adjacent two of the plurality of bonding electrodes gradually increases; and

along the second direction from the center of the base substrate to the edge of the base substrate, a distance between centers of adjacent two of the plurality of bonding electrodes gradually increases.

7. The display panel according to claim 6 , wherein a standard matrix structure comprising a plurality of standard bonding positions is defined on the plane where the base substrate is located; each of the plurality of standard bonding positions has a same size; a distance between centers of adjacent two of the plurality of standard bonding positions along the first direction is Dx; and a distance between centers of adjacent two of the plurality of standard bonding positions along the second direction is Dy;

the matrix structure comprises the plurality of bonding electrodes in one-to-one correspondence to the plurality of standard bonding positions; along the first direction from the center of the base substrate to the edge of the base substrate, a center offset amount between an n-th bonding electrode and an n-th standard bonding position is Bxn satisfying: Bxn=k×Dxn, wherein k is a linear expansion coefficient of a transfer material for bonding the plurality of Micro-LEDs, and Dxn=n×Dx; and

along the second direction from the center of the base substrate to the edge of the base substrate, a center offset amount between the n-th bonding electrode and the n-th standard bonding position is Byn satisfying: Byn=k×Dyn, wherein Dyn=n×Dy.

8. The display panel according to claim 7 , wherein along the first direction from the center of the base substrate to the edge of the base substrate, a size of each of the plurality of bonding electrodes gradually increases.

9. The display panel according to claim 8 , wherein each of the plurality of bonding electrodes comprises a positive electrode and a negative electrode; the positive electrode of the each of the plurality of bonding electrodes and the negative electrode of the each of the plurality of bonding electrodes are sequentially arranged along the first direction; along the first direction, a size of the positive electrode is L 1 , a size of the negative electrode is L 2 , and a size of a gap between the positive electrode and the negative electrode is U; and

each of the plurality of bonding electrodes comprises a standard portion and a widened portion; an area of a vertical projection of the standard portion on the base substrate is same as an area of a corresponding standard bonding position; and along the first direction from the center of the base substrate to the edge of the base substrate, a size of the widened portion of each of the plurality of bonding electrodes is En satisfying:

E

⁢

n

=

(

L

⁢

1

+

L

⁢

2

2

+

U

)

*

k

.

10. The display panel according to claim 1 , wherein along the direction from the center of the base substrate to the edge of the base substrate, the distance between the centers of the adjacent two of the plurality of bonding electrodes gradually increases;

centers of the plurality of bonding electrodes are arranged around the center of the base substrate to form an annular structure; and along a direction from the center of the base substrate to the edge of the base substrate, the base substrate comprises a plurality of annular structures with coincident centers; and

along a direction from the center of the base substrate to the annular structure, a distance between centers of adjacent two of at least part of the plurality of bonding electrodes gradually increases.

11. The display panel according to claim 10 , wherein each of the plurality of bonding electrodes comprises a first edge being linear; and the first edge is disposed parallel to a tangent line of an annular structure where the bonding electrode comprising the first edge is located.

12. The display panel according to claim 10 , wherein a plurality of standard annular structures are defined on the plane where the base substrate is located; each of the plurality of standard annular structures comprises a plurality of standard bonding positions; each of the plurality of standard bonding positions has a same size; and along the direction from the center of the base substrate to the annular structure, a distance between centers of adjacent two of the plurality of standard bonding positions is Dm; and

each of the annular structure comprises bonding electrodes in one-to-one correspondence to the plurality of standard bonding positions; along the direction from the center of the base substrate to the annular structure, an offset from a center of an n-th bonding electrode to a center of an n-th standard bonding position is Cmn satisfying: Cmn=k×Dmn, wherein k is a linear expansion coefficient of a transfer material for bonding the plurality of Micro-LEDs, and Dxn=n×Dm.

13. The display panel according to claim 1 , wherein along the direction from the center of the base substrate to the edge of the base substrate, the distance between the centers of the adjacent two of the plurality of bonding electrodes gradually increases; and

along the direction from the center of the base substrate to the edge of the base substrate, distances between centers of adjacent two of the plurality of bonding electrodes are in an arithmetic progression, or distances between centers of adjacent two of the plurality of bonding electrodes are in a higher-order arithmetic progression.

14. The display panel according to claim 1 , wherein a side wall of each of the plurality of Micro-LEDs is provided with a light-absorbing material; and the light-absorbing material is a linear thermal expansion material.

15. The display panel according to claim 14 , wherein along the direction from the center of the base substrate to the edge of the base substrate, a thickness of the light-absorbing material disposed on the side wall of the each of the plurality of Micro-LEDs gradually increases.

16. The display panel according to claim 14 , wherein a linear thermal expansion coefficient of the light-absorbing material is same as a linear expansion coefficient of a transfer material for bonding the plurality of Micro-LEDs.

17. A display device, comprising a display panel,

wherein the display panel comprises: a base substrate;

wherein the base substrate is provided with a plurality of bonding electrodes; a plurality of micro light emitting displays (Micro-LEDs) are disposed on a side of the plurality of bonding electrodes facing away from the base substrate; and the plurality of Micro-LEDs are electrically connected to the plurality of bonding electrodes in one-to-one correspondence; and

on a plane parallel to a plane where the base substrate is located, along a direction from a center of the base substrate to an edge of the base substrate, a size of each bonding electrode of the plurality of bonding electrodes gradually increases and/or a distance between centers of adjacent two of the plurality of bonding electrodes gradually increases to enable each Micro-LED of the plurality of Micro-LEDs to be bonded with a corresponding bonding electrode.

18. A manufacturing method of a display panel, comprising:

obtaining a base substrate, wherein a plurality of bonding electrodes are disposed on the base substrate; and on a plane parallel to a plane where the base substrate is located and along a direction from a center of the base substrate to an edge of the base substrate, a size of each of the plurality of bonding electrodes gradually increases, or a distance between centers of adjacent two of the plurality of bonding electrodes gradually increases;

obtaining a plurality of micro light emitting displays (Micro-LEDs) disposed in an array on a transfer substrate, wherein the plurality of Micro-LEDs and the transfer substrate are attached through a transfer material; the transfer material is a thermal expandable material; the plurality of Micro-LEDs form a chip array on the transfer substrate; each of the plurality of Micro-LED has a same size; and distances between adjacent Micro-LEDs are the same; and

bonding each of the plurality of Micro-LEDs with a corresponding bonding electrode, so that after each of the plurality of Micro-LEDs is offset due to the transfer material, each of the plurality of Micro-LEDs are bonded with the corresponding bonding electrode.

19. The manufacturing method of a display panel according to claim 18 , wherein on the plane parallel to the plane where the base substrate is located and along the direction from the center of the base substrate to the edge of the base substrate, the distance between the centers of the adjacent two of the plurality of bonding electrodes gradually increases; and

the manufacturing method of a display panel further comprises:

defining a standard array structure comprising a plurality of standard bonding positions on the plane where the base substrate is located; wherein the plurality of standard bonding positions and the plurality of Micro-LEDs of the chip array are in one-to-one correspondence and each of the plurality of standard bonding positions has a same size; and a distance between centers of adjacent two of the plurality of standard bonding positions is same as a distance between adjacent Micro-LEDs; and

performing simulated stretch to the standard array structure according to an expansion coefficient of the transfer material to obtain a target array structure; wherein in the target array structure, along the direction from the center of the base substrate to the edge of the base substrate, a distance between centers of adjacent two of the plurality of bonding positions gradually increases; and

obtaining the base substrate comprises: disposing the plurality of the bonding electrodes on the base substrate in one-to-one correspondence to the plurality of bonding positions in the target array structure.

20. The manufacturing method of a display panel according to claim 18 , wherein disposing the plurality of bonding electrodes on the base substrate comprises:

forming a seed layer on the base substrate; and

forming the plurality of bonding electrodes on the seed layer through an electroplating process; wherein on the plane parallel to the plane where the base substrate is located and along the direction from the center of the base substrate to the edge of the base substrate, the size of the each of the plurality of bonding electrodes gradually increases.