Display panel, preparation method thereof, and display device

1. A display panel, comprising:

a plurality of sub-panels, wherein each of the plurality of sub-panels comprises a first substrate, a second substrate, bezel adhesive located between the first substrate and the second substrate, a plurality of bank structures, and a plurality of light-emitting elements; at least one of the plurality of light-emitting elements forms a pixel unit; and each of the plurality of bank structures is located between adjacent pixel units; and

seaming adhesive located between adjacent sub-panels of the plurality of sub-panels,

wherein the plurality of sub-panels share a same first substrate, and the seaming adhesive is disposed on the same first substrate;

wherein the first substrate comprises a display region and a non-display region surrounding the display region, the plurality of light-emitting elements and the plurality of bank structures are located in the display region, and the bezel adhesive is located in the non-display region; and

wherein the plurality of sub-panels form an array structure of M rows and N columns;

the plurality of sub-panels comprise first-type sub-panels and second-type sub-panels;

the first-type-sub-panels refers to sub-panels located in a first row and a first column of the array structure sub-panels located in the first row and an N-th column of the array structure subpanels located in an M-th row and the first column of the array structure, and sub-panels located in the M-th row and the N-th column of the array structure;

the second-type sub-panels refers to sub-panels in the plurality of sub-panels other than the first-type sub-panels;

bezel adhesive of each of the first-type sub-panels is located on two bezels of the each of the first-type sub-panels; and

bezel adhesive of each of the second-type sub-panels is located on one bezel of the each of the second-type sub-panels,

wherein M and N are both positive integers, M=2, and N≥2; or

M and N a both integers, N=2, and M≥2.

2. The display panel of claim 1 , wherein the bezel adhesive is disposed on the first substrate; and

wherein the bezel adhesive forms a closed ring structure.

3. The display panel of claim 1 , wherein each of the plurality of sub-panels further comprises a flexible circuit board, and the non-display region comprises a first non-display region and a second non-display region; and

the display panel comprises the plurality of sub-panels in two rows and N columns, a flexible circuit board of one of the plurality of sub-panels in a first row is bound to the first non-display region, and the first non-display region is the non-display region on a side of the plurality of sub-panels in the first row farther from the plurality of sub-panels in a second row; a flexible circuit board of the one of the plurality of sub-panels in the second row is bound to the second non-display region, and the second non-display region is the non-display region on a side of the plurality of sub-panels in the second row farther from the plurality of sub-panels in the first row; or

the display panel comprises The plurality of sub-panels in M rows and two columns, a flexible circuit board of one of the plurality of sub-panels in a first column is bound to a third non-display region, and the third non-display region is the non-display region on a side of the plurality of sub-panels in the first column farther from the plurality of sub-panels in a second column: a flexible circuit board of the one of the plurality of sub-panels in the second column is bound to a fourth non-display region, and the fourth non-display region is the non-display region on a side of the plurality of sub-panels in the second column farther from the plurality of sub-panels in the first column.

4. The display panel of claim 1 , wherein

the seaming adhesive between the first-type sub-panels and the second-type sub-panels extends between the first substrate and the plurality of second substrates; and

in a direction parallel to an extension direction of the seaming adhesive and parallel to the first substrate, a width of the seaming adhesive extending between the first substrate and the second substrate corresponding to the first-type sub-panels is a first width; a width of the seaming adhesive extending between the first substrate and the second substrate corresponding to the second-type sub-panels is a second width, and

wherein the first width is less than the second width.

5. The display panel of claim 1 , wherein

the plurality of sub-panels comprise third-type sub-panels and fourth-type sub-panels;

an area of each of the third-type sub-panels is greater than an area of each of the fourth-type sub-panels;

the seaming adhesive between the third-type sub-panels and the fourth-type sub-panels extends between the first substrate and the plurality of second substrates; and

wherein in a direction parallel to an extension direction of the seaming adhesive and parallel to the first substrate, a width of the seaming adhesive extending between the first substrate and the second substrate corresponding to the third-type sub-panels is a third width; a width of the seaming adhesive extending between the first substrate and the second substrate corresponding to the fourth-type sub-panels is a fourth width, and

wherein the third width is greater than the fourth width.

6. A display panel, comprising:

a plurality of sub-panels wherein each of the plurality of sub-panels comprises a first substrate, a second substrate, bezel adhesive located between the first substrate and the second substrate, a plurality of bank structures, and a plurality of light-emitting elements; at least one of the plurality of light-emitting elements forms a pixel unit; and each of the plurality of bank structures is located between adjacent pixel units; and

seaming adhesive located between adjacent sub-panels of the plurality of sub-panels,

wherein the plurality of sub-panels share a same first substrate, and the seaming adhesive is disposed on the same first substrate;

wherein the first substrate comprises a display region and a non-display region surrounding the display region, the plurality of light-emitting elements and the plurality of bank structures are located in the display region, and the bezel adhesive is located in the non-display region; and

wherein the plurality of bank structures comprise a plurality of first bank structures located at a bezel of the second substrate: at least one of the plurality of first bank structures comprises a first surface closer to the first substrate, a second surface farther from the first substrate, and a third surface connected to the first surface and the second surface; and

the seaming adhesive is disposed at the third surfaces of the plurality of first bank structures between adjacent sub-panels of the plurality of sub-panels, and the third surfaces all contact the seaming adhesive.

7. The display panel of claim 6 , wherein

the seaming adhesive comprises a fourth surface closer to the first substrate and a fifth surface farther from the first substrate;

the second substrate comprises a sixth surface closer to the first substrate and a seventh surface farther from the first substrate; and

a distance from the fifth surface to the first substrate is greater than a distance from the seventh surface to the first substrate.

8. The display panel of claim 7 , wherein the seaming adhesive comprises a first sub-section and a second sub-section that are arranged continuously; the first sub-section is located between adjacent sub-panels of the plurality of sub-panels, and the second sub-section contacts the seventh surface; and

along a direction parallel to the plane where the first substrate is located, a width of the first sub-section is less than a width of the second sub-section.

9. The display panel of claim 6 , wherein along a direction from the first substrate to the second substrate, the seaming adhesive comprises a third sub-section and a fourth sub-section that are arranged continuously:

the third sub-section is located between adjacent third surfaces of first bank structures of the plurality of first bank structures of the sub-panels of the plurality of sub-panels;

the fourth sub-section is located among the plurality of second substrates of the plurality of sub-panels; and

a sectional shape of the third sub-section is inverted trapezoid.

10. The display panel of claim 6 , wherein the seaming adhesive comprises a third sub-section and a fourth sub-section that are arranged continuously;

the third sub-section is located between adjacent third surfaces of first bank structures of the plurality of first bank structures of sub-panels of the plurality of sub-panels;

the fourth sub-section is located among the plurality of second substrates of the plurality of sub-panels; and

along a direction parallel to the first substrate, a width of the third sub-section is greater than a width of the fourth sub-section.

11. The display panel of claim 6 , wherein each of the plurality of sub-panels further comprises a reflective layer located on a surface of a respective one of the plurality of bank structures; and

the reflective layer is not disposed between the seaming adhesive disposed at the third surfaces of the plurality of first bank structures between adjacent sub-panels of the plurality of sub-panels and the third surfaces.

12. The display panel of claim 1 , wherein the plurality of bank structures are disposed on the first substrate; and the plurality of light-emitting elements are disposed on the second substrate; or,

wherein the plurality of light-emitting elements are disposed on the first substrate; and

the plurality of bank structures are disposed on the second substrate.

13. The display panel of claim 1 , wherein each of the plurality of pixel units comprises a plurality of sub-pixels;

the first substrate comprises a fifth sub-section and a sixth sub-section;

the fifth sub-section is located between vertical projections of two adjacent ones of the plurality of sub-pixels in a same one of the plurality of sub-panels on a plane where the first substrate is located;

the sixth sub-section is located between vertical projections of two adjacent ones of the plurality of sub-pixels in two different ones of the plurality of sub-panels on the plane where the first substrate is located; and

an elastic modulus of the fifth sub-section is less than an elastic modulus of the sixth sub-section.

14. A preparation method of a display panel, comprising:

providing a first substrate and a plurality of second substrates, wherein the first substrate comprises a display region and a non-display region surrounding the display region;

aligning and bonding the plurality of second substrates to the first substrate, wherein one of the plurality of second substrates and the first substrate form a sub-panel; bezel adhesive, a plurality of bank structures, and a plurality of light-emitting elements are disposed between the first substrate and the plurality of second substrates; at least one of the plurality of light-emitting elements forms a pixel unit; each of the plurality of bank structures is located between adjacent pixel units; the plurality of light-emitting elements and the plurality of bank structures are located in the display region, and the bezel adhesive is located in the non-display region;

forming seaming adhesive between adjacent sub-panels on the first substrate; and

curing the seaming adhesive to form a display panel;

wherein before aligning and bonding the plurality of second substrates to the first substrate, the method further comprises:

forming the bezel adhesive in the non-display region on the first substrate.

15. The preparation method of claim 14 , wherein before aligning and bonding the plurality of second substrates to the first substrate, the method further comprises:

splicing the plurality of second substrates; wherein aligning and bonding the plurality of second substrates to the first substrate comprises:

disposing the first substrate on the plurality of second substrates spliced with the bezel adhesive facing towards the plurality of second substrates.

16. The preparation method of claim 14 , wherein at least part of the plurality of second substrates each comprises a bezel adhesive placing region, and the non-display region comprises the bezel adhesive placing region; and

wherein before aligning and bonding the plurality of second substrates to the first substrate, the method further comprises:

forming the bezel adhesive in the bezel adhesive placing region on the plurality of second substrates.

17. The preparation method of claim 16 , wherein before aligning and bonding the plurality of second substrates to the first substrate, the method further comprises:

splicing the plurality of second substrates;

wherein aligning and bonding the plurality of second substrates to the first substrate comprises:

disposing the first substrate on the plurality of second substrates spliced.

18. A display device, comprising the display panel according to claim 1 .

19. A display device, comprising the display panel according to claim 6 .