Display panel and display device

1 . A display panel, comprising:

a driving backplane;

a first electrode, disposed on a side of the driving backplane;

a pixel definition layer, disposed on a same side of the driving backplane as the first electrode, and provided with a pixel opening exposing each first electrode and a separation slot between two adjacent pixel openings, wherein a boundary of the pixel opening is located within a boundary of a first electrode exposed by the pixel opening; a sidewall of the pixel opening is provided with a first cut-off slot, and a sidewall of the separation slot is provided with a second cut-off slot; and the first cut-off slot is at least partially located on a side of the second cut-off slot away from the driving backplane;

a light-emitting layer, by which the pixel definition layer and the first electrode are covered; and

a second electrode, by which the light-emitting layer is covered.

2 . The display panel according to claim 1 , wherein the pixel definition layer comprises an etching barrier layer, a first definition layer and a second definition layer stacked in sequence in a direction away from the driving backplane;

the etching barrier layer, the first definition layer and the second definition layer are penetrated by the pixel opening, the first definition layer and the second definition layer are penetrated by the separation slot, and the etching barrier layer is exposed by the separation slot;

the first cut-off slot and the second cut-off slot are located at the first definition layer;

wherein the etching barrier layer comprises:

a buffer layer, at least partially disposed on a surface of the first electrode away from the driving backplane; and

a barrier layer, stacked on a surface of the buffer layer away from the driving backplane, wherein the first definition layer is stacked on a surface of the barrier layer away from the driving backplane.

3 . The display panel according to claim 2 , wherein the pixel opening comprises a first segment located at the etching barrier layer and a second segment located at the second definition layer, and a boundary of an orthographic projection of the second segment on the driving backplane surrounds outside a boundary of an orthographic projection of the first segment on the driving backplane.

4 . The display panel according to claim 3 , wherein a distance between the boundary of the orthographic projection of the second segment on the driving backplane and the boundary of the orthographic projection of the first segment on the driving backplane is not greater than 0.2 μm and not smaller than 0.06 μm; and

wherein a distance between portions of two adjacent pixel openings located in the first segment is not greater than 1.9 μm and not smaller than 1.1 μm; and

a distance between portions of the two adjacent pixel openings located in the second segment is not greater than 1.6 μm and not smaller than 0.9 μm.

5 . The display panel according to claim 1 , wherein a length of a sidewall away from the driving backplane among two sidewalls of the first cut-off slot is not smaller than 0.03 μm and not greater than 0.05 μm; and

wherein a length of a sidewall away from the driving backplane among two sidewalls of the second cut-off slot is not smaller than 0.07 μm and not greater than 0.1 μm.

6 . The display panel according to claim 2 , wherein the pixel definition layer further comprises:

a filling layer, disposed on the same side of the driving backplane as the first electrode, and separating each first electrode, wherein the etching barrier layer is partially stacked on a surface of the filling layer away from the driving backplane;

wherein the surface of the filling layer away from the driving backplane is located on a side close to the driving backplane of a surface of the first electrode away from the driving backplane; and

the pixel definition layer comprises an edge portion, a middle portion and a connection portion, wherein the edge portion is located on the surface of the first electrode away from the driving backplane, the middle portion is located between two adjacent first electrodes, and the connection portion is connected to the edge portion and the middle portion.

7 . The display panel according to claim 6 , wherein the sidewall of the separation slot is a slope surface expanding in the direction away from the driving backplane;

wherein a bottom surface of the first cut-off slot is a slope surface which makes a depth of the first cut-off slot decrease in the direction away from the driving backplane; and

a bottom surface of the second cut-off slot is a slope surface which makes a depth of the second cut-off slot decrease in the direction away from the driving backplane;

wherein a slope of the connection portion is smaller than slopes of the bottom surface of the first cut-off slot and the bottom surface of the second cut-off slot.

8 . The display panel according to claim 1 , wherein an orthographic projection of the first cut-off slot on the driving backplane is located within an orthographic projection of the first electrode on the driving backplane.

9 . The display panel according to claim 1 , wherein at least a partial area of the second cut-off slot has a width greater than a width of the first cut-off slot; and

wherein a depth of the second cut-off slot is smaller than a depth of the first cut-off slot.

10 . The display panel according to claim 1 , wherein an comprised angle between a sidewall of the second cut-off slot away from the driving backplane and a surface of the driving backplane on which the first electrode is disposed is greater than an comprised angle between a sidewall of the first cut-off slot away from the driving backplane and the surface of the driving backplane on which the first electrode is disposed.

11 . The display panel according to claim 1 , wherein a width difference between the first cut-off slot and the second cut-off slot is smaller than a width of one of the first cut-off slot and the second cut-off slot; and

wherein a half of a difference between a distance between two adjacent pixel openings and a width of the separation slot is greater than the width of the separation slot.

12 . The display panel according to claim 1 , wherein the first electrode comprises:

a first conductive layer, disposed on the side of the driving backplane;

a second conductive layer, stacked on a surface of the first conductive layer away from the driving backplane; and

a first conductive protection layer, by which a surface of the second conductive layer away from the driving backplane and sidewalls of the second conductive layer and the first conductive layer are covered.

13 . The display panel according to claim 12 , wherein the first electrode further comprises a second conductive protection layer, by which the first conductive protection layer is covered; and

wherein a surface of the driving backplane on which the first electrode is disposed is provided with a first groove, and a second groove is disposed at a bottom of the first groove; and

areas of a sidewall and a bottom surface of the first groove that are located outside the second groove are covered by the first conductive protection layer and the second conductive protection layer.

14 . The display panel according to claim 12 , wherein a width of the separation slot is equal to a width of the second groove; and

wherein a width of the first groove is not smaller than 0.5 μm and not greater than 1.2 μm, and a width of the second groove is not smaller than 0.2 μm and not greater than 0.9 μm.

15 . The display panel according to claim 1 , wherein the light-emitting layer comprises a hole injection layer and a light-emitting sub-layer disposed on a side of the hole injection layer away from the driving backplane;

Wherein two adjacent light-emitting sub-layers are coupled in series through a charge generation layer between the two adjacent light-emitting sub-layers;

the light-emitting sub-layer comprises a hole transport layer, at least one light-emitting material layer, and an electron transport layer disposed in a direction away from the driving backplane;

the hole injection layer is disconnected at the first cut-off slot; and

at least one charge generation layer is disconnected at the second cut-off slot.

16 . The display panel according to claim 15 , wherein a sidewall of at least one pixel opening is provided with a plurality of first cut-off slots distributed in a circumferential direction; and at least two first cut-off slots of a same pixel opening have different widths.

17 . The display panel according to claim 16 , wherein a number of light-emitting sub-layers is three, and a number of charge generation layers is two; and

in two first cut-off slots with different widths of the same pixel opening, a width difference between the two first cut-off slots is 0.8 to 1.2 times a width difference between one of the first cut-off slots and the second cut-off slot.

18 . The display panel according to claim 15 , wherein a number of the light-emitting sub-layers is two, and a number of charge generation layers is one; a light-emitting sub-layer farther from the driving backplane comprises a light-emitting material layer that emits blue light; and

a distance between the light-emitting material layer that emits the blue light and the charge generation layer within the pixel opening is greater than a distance between the light-emitting material layer that emits the blue light and the charge generation layer within a range of the pixel definition layer.

19 . The display panel according to claim 1 , wherein a planarization portion is formed by the second electrode in an area corresponding to the first electrode, and a depression portion is formed by the second electrode in an area corresponding to the separation slot, and a smooth transition is formed between the depression portion and the planarization portion.

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

a driving backplane;

a first electrode, disposed on a side of the driving backplane;

a pixel definition layer, disposed on a same side of the driving backplane as the first electrode, and provided with a pixel opening exposing each first electrode and a separation slot between two adjacent pixel openings, wherein a boundary of the pixel opening is located within a boundary of a first electrode exposed by the pixel opening; a sidewall of the pixel opening is provided with a first cut-off slot, and a sidewall of the separation slot is provided with a second cut-off slot; and the first cut-off slot is at least partially located on a side of the second cut-off slot away from the driving backplane;

a light-emitting layer, by which the pixel definition layer and the first electrode are covered; and

a second electrode, by which the light-emitting layer is covered.