Display panel, display device, and preparation method

1 . A display panel, comprising:

a base substrate;

electrode units disposed on a side of the base substrate, wherein the electrode units comprise a main electrode unit and redundant electrode units;

a first light-emitting unit electrically connected to the main electrode unit;

bank structures;

openings disposed among the bank structures, and

functional structures,

wherein the openings comprise first openings, and

wherein for a first opening of the first openings, a redundant electrode unit of the redundant electrode units is disposed in the first opening; and

wherein for a first opening of a part of the first openings, the first opening is filled with a functional structure of the functional structures, and the functional structure is at least partially disposed on a side of the redundant electrode unit facing away from the base substrate;

wherein at least two bank structures of the bank structures are provided between adjacent redundant electrode units of the redundant electrode units, a third opening is provided between adjacent bank structures of the bank structures, and the third opening is filled with a part of the functional structures;

or

the display panel further comprises:

a second encapsulation structure, and at least one of a fourth opening or a fifth opening; wherein the second encapsulation structure is at least partially disposed on a side of the first light-emitting unit facing away from the base substrate, and an orthographic projection of the second encapsulation structure on the base substrate covers an orthographic projection of the first light-emitting unit on the base substrate; for the fourth opening, at least one sidewall of the fourth opening is a sidewall of the second encapsulation structure, and the fourth opening is filled with a part of the functional structures; for the fifth opening, at least one sidewall of the fifth opening is a sidewall of the second encapsulation structure, and at least one sidewall of the fifth opening is a side wall of a bank structure of the bank structures, a part of the redundant electrode units is disposed in the fifth opening, the fifth opening is filled with a part of the functional structures, and the part of the functional structures is at least partially disposed on a side of the part of the redundant electrode units facing away from the base substrate;

or

wherein the functional structures comprise a light-shielding material.

2 . The display panel according to claim 1 , further comprising: a first encapsulation structure and a second light-emitting unit, wherein the openings further comprise a second opening, and the second light-emitting unit is disposed in the second opening; and the second opening is filled with the first encapsulation structure, and the first encapsulation structure is at least partially disposed on a side of the second light-emitting unit facing away from the base substrate.

3 . The display panel according to claim 2 , wherein the first encapsulation structure comprises a top surface, wherein the top surface is disposed, along a direction perpendicular to a plane in which the base substrate is located, on a side of the first encapsulation structure facing away from the base substrate; and the top surface is an arc surface and protrudes toward a direction away from the base substrate.

4 . The display panel according to claim 3 , wherein the second light-emitting unit comprises a first-color light-emitting unit and a second-color light-emitting unit, and the first encapsulation structure comprises a first encapsulation sub-structure and a second encapsulation sub-structure, wherein,

the first encapsulation sub-structure corresponds to the first-color light-emitting unit, and the second encapsulation sub-structure corresponds to the second-color light-emitting unit;

an area of an orthographic projection of a top surface of the first encapsulation sub-structure on the base substrate is smaller than an area of an orthographic projection of a top surface of the second encapsulation sub-structure on the base substrate; and

a wavelength of light emitted from the first-color light-emitting unit is greater than a wavelength of light emitted from the second-color light-emitting unit.

5 . The display panel according to claim 3 , wherein the second light-emitting unit comprises a first-color light-emitting unit and a second-color light-emitting unit, and the first encapsulation structure comprises a first encapsulation sub-structure and a second encapsulation sub-structure, wherein,

the first encapsulation sub-structure corresponds to the first-color light-emitting unit, and the second encapsulation sub-structure corresponds to the second-color light-emitting unit; and

a sectional shape of a top surface of the first encapsulation sub-structure on a first plane is a first arc, and a sectional shape of a top surface of the second encapsulation sub-structure on the first plane is a second arc, wherein a radius of curvature corresponding to the first arc is smaller than a radius of curvature corresponding to the second arc, and the first plane is perpendicular to the base substrate.

6 . The display panel according to claim 3 , wherein in a direction perpendicular to the base substrate, a height difference between the top surface and a surface of a side of the bank structures facing away from the base substrate is less than or equal to 6 μm.

7 . The display panel according to claim 1 , wherein the first openings comprise a first sub-opening and a second sub-opening, and the bank structures comprise a first side surface facing away from the first sub-opening and a second side surface facing away from the second sub-opening, wherein,

an included angle between the first side surface and a surface of a side of the bank structures facing away from the base substrate is a first included angle, and an included angle between the second side surface and a surface of a side of the bank structures facing away from the base substrate is a second included angle, wherein one of the first included angle or the second included angle is greater than another one of the first included angle or the second included angle.

8 . The display panel according to claim 7 , wherein the redundant electrode units comprise a first redundant electrode unit and a second redundant electrode unit, wherein the first redundant electrode unit is disposed in the first sub-opening, and the second redundant electrode unit is disposed in the second sub-opening:

wherein the first light-emitting unit comprises a third-color light-emitting unit and a fourth-color light-emitting unit, wherein a wavelength of light emitted from the third-color light-emitting unit is greater than a wavelength of light emitted from the fourth-color light-emitting unit; and

wherein the first redundant electrode unit corresponds to a first pixel circuit, and the second redundant electrode unit corresponds to a second pixel circuit, wherein the first pixel circuit is configured to drive the third-color light-emitting unit, and the second pixel circuit is configured to drive the fourth-color light-emitting unit; and

wherein the first included angle is smaller than the second included angle.

9 . The display panel according to claim 1 ,

wherein a distance from a surface of a side of the second encapsulation structure facing away from the base substrate to the base substrate is equal to a distance from a surface of a side of the bank structures facing away from the base substrate to the base substrate.

10 . The display panel according to claim 1 ,

wherein the second encapsulation structure comprises a third side surface and a first surface, wherein, the third side surface is disposed on a side of the second encapsulation structure along a first direction, and the first direction is parallel to a plane in which the base substrate is located: in a direction perpendicular to the plane in which the base substrate is located, the first surface is disposed on a side of the second encapsulation structure facing away from the base substrate; and an included angle between the third side surface and the first surface is a third included angle, wherein the third included angle is an acute angle.

11 . The display panel according to claim 10 , wherein for a bank structure of a part of the bank structures, the bank structure comprises a fourth side surface and a second surface, wherein the fourth side surface is disposed on a side of the bank structure along the first direction: in the direction perpendicular to the plane in which the base substrate is located, the second surface is disposed on a side of the bank structure facing away from the base substrate; and an included angle between the fourth side surface and the second surface is a fourth included angle, the third included angle is smaller than the fourth included angle, and the fourth included angle is an acute angle.

12 . A display device, comprising a display panel, wherein the display panel comprises:

a base substrate;

electrode units disposed on a side of the base substrate, wherein the electrode units comprise a main electrode unit and redundant electrode units;

a first light-emitting unit electrically connected to the main electrode unit;

bank structures;

openings disposed among the bank structures, and

functional structures,

wherein the openings comprise first openings, and

wherein for a first opening of the first openings, a redundant electrode unit of the redundant electrode units is disposed in the first opening; and

wherein for a first opening of a part of the first openings, the first opening is filled with a functional structure of the functional structures, and the functional structure is at least partially disposed on a side of the redundant electrode unit facing away from the base substrate;

wherein at least two bank structures of the bank structures are provided between adjacent redundant electrode units of the redundant electrode units, a third opening is provided between adjacent bank structures of the bank structures, and the third opening is filled with a part of the functional structures;

or

the display panel further comprises:

a second encapsulation structure, and at least one of a fourth opening or a fifth opening: wherein the second encapsulation structure is at least partially disposed on a side of the first light-emitting unit facing away from the base substrate, and an orthographic projection of the second encapsulation structure on the base substrate covers an orthographic projection of the first light-emitting unit on the base substrate; for the fourth opening, at least one sidewall of the fourth opening is a sidewall of the second encapsulation structure, and the fourth opening is filled with a part of the functional structures; for the fifth opening, at least one sidewall of the fifth opening is a sidewall of the second encapsulation structure, and at least one sidewall of the fifth opening is a side wall of a bank structure of the bank structures, a part of the redundant electrode units is disposed in the fifth opening, the fifth opening is filled with a part of the functional structures, and the part of the functional structures is at least partially disposed on a side of the part of the redundant electrode units facing away from the base substrate;

or

wherein the functional structures comprise a light-shielding material.

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

providing a base substrate;

forming electrode units on a side of the base substrate, wherein the electrode units comprise a main electrode unit and redundant electrode units;

electrically connecting a first light element unit to the main electrode unit;

forming, on the base substrate, bank structures and openings disposed among the bank structures, wherein the openings comprise first openings, and wherein for a first opening of the first openings, a redundant electrode unit of the redundant electrode units is disposed in the first opening, wherein at least two bank structures of the bank structures are provided between adjacent redundant electrode units of the redundant electrode units; and

forming functional structures, wherein for a first opening of a part of the first openings is filled with a functional structure of the functional structures, and the functional structure is at least partially disposed on a side of the redundant electrode unit facing away from the base substrate;

forming a third opening between adjacent bank structures of the bank structures, filling the third opening with a part of the functional structures;

or

wherein after electrically connecting the first light-emitting unit to the main electrode unit, the method further comprises: forming a second encapsulation structure, and at least one of a fourth opening or a fifth opening; wherein the second encapsulation structure is at least partially disposed on a side of the first light-emitting unit facing away from the base substrate, and an orthographic projection of the second encapsulation structure on the base substrate covers an orthographic projection of the first light-emitting unit on the base substrate; for the fourth opening, at least one sidewall of the fourth opening is a sidewall of the second encapsulation structure, and the fourth opening is filled with a part of the functional structures; for the fifth opening, at least one sidewall of the fifth opening is a sidewall of the second encapsulation structure, and at least one sidewall of the fifth opening is a side wall of a bank structure of the bank structures, a part of the redundant electrode units is disposed in the fifth opening, the fifth opening is filled with a part of the functional structures, and the part of the functional structures is at least partially disposed on a side of the part of the redundant electrode units facing away from the base substrate;

or

wherein the functional structures comprise a light-shielding material.

14 . The preparation method according to claim 13 , wherein after electrically connecting the first light-emitting unit to the main electrode unit and before forming the functional structures, the method further comprises:

electrically connecting a second light-emitting unit to a part of the redundant electrode units, wherein the openings further comprise a second opening, and the second light-emitting unit is disposed in the second opening; and

wherein after electrically connecting the second light-emitting unit to the part of the redundant electrode units, the method further comprises:

filling the second opening with a first encapsulation structure, wherein the first encapsulation structure is at least partially disposed on a side of the second light-emitting unit facing away from the base substrate.

15 . The preparation method according to claim 13 ,

wherein forming, on the base substrate, the bank structures and the openings disposed among the bank structures, and forming the second encapsulation structure comprise:

forming an encapsulation layer on the base substrate, wherein the encapsulation layer is at least partially disposed on the side of the first light-emitting unit facing away from the base substrate and a side of the electrode units facing away from the base substrate, and an orthographic projection of the encapsulation layer on the base substrate covers the orthographic projection of the first light-emitting unit on the base substrate and an orthographic projection of the electrode units on the base substrate; and

patterning the encapsulation layer through a photolithography technique to form the second encapsulation structure and the bank structures.

16 . The preparation method according to claim 14 , wherein filling the second opening with the first encapsulation structure comprises:

determining that an opening enclosed by two bank structures of the bank structures corresponding to the part of the redundant electrode units electrically connected to the second light-emitting unit is the second opening; and

filling the second opening with the first encapsulation structure through a printing technique.

17 . The preparation method according to claim 14 , wherein forming the functional structure comprises:

attaching, in a heated vacuum environment, a functional structure adhesive layer to the side of the base substrate on which the bank structures are disposed, wherein an orthographic projection of the functional structure adhesive layer on the base substrate covers orthographic projections of the bank structures, the openings among the bank structures, and the first encapsulation structure on the base substrate; and

thinning the functional structure adhesive layer through an ash technique or a wet etching technique to form the functional structure.