Display substrate and display device

1 . A display substrate, comprising:

a drive backplane;

a first electrode layer disposed on a side of the drive backplane, wherein the first electrode layer is provided with a plurality of first electrodes electrically connected to the drive backplane;

a pixel definition layer disposed on a side, distal to the drive backplane, of the first electrode layer, wherein the pixel definition layer is provided with a plurality of pixel opening holes in one-to-one correspondence with the plurality of first electrodes and a partition groove disposed between adjacent pixel opening holes, and at least a portion of each first electrode is disposed in the pixel opening hole corresponding to the first electrode;

an organic light-emitting layer disposed on a side, distal to the drive backplane, of the pixel definition layer, wherein the organic light-emitting layer comprises: a plurality of organic material layers stacked in a direction perpendicular to and away from the drive backplane, and a portion of the organic material layer disposed inside the partition groove is separated from a portion of the organic material layer disposed outside the partition groove; and

a second electrode layer disposed on a side, distal to the drive backplane, of the organic light-emitting layer;

wherein the display substrate further comprises an auxiliary support layer, wherein the auxiliary support layer and the first electrode layer are arranged on a same layer and are made of different materials, a thickness of the auxiliary support layer being less than or equal to a thickness of the first electrode layer:

wherein the orthographic projection of the partition groove onto the drive backplane falls within an orthographic projection of the auxiliary support layer onto the drive backplane; and

wherein the auxiliary support layer is provided with a plurality of hollow structures in one-to-one correspondence with the plurality of first electrodes, and outer boundaries of orthographic projections of the hollow structures onto the drive backplane are overlapped with outer boundaries of orthographic projections of the first electrodes onto the drive backplane.

2 . The display substrate according to claim 1 , wherein a recess structure is provided on a sidewall of the partition groove.

3 . The display substrate according to claim 2 , wherein the pixel definition layer comprises a first sub-definition layer and a second sub-definition layer stacked in the direction perpendicular to and away from the drive backplane, the partition groove extends through the first sub-definition layer and the second sub-definition layer, and a side, proximal to the partition groove, of the second sub-definition layer protrudes with respect to a side, proximal to the partition groove, of the first sub-definition layer.

4 . The display substrate according to claim 3 , wherein the partition groove comprises: a first sub-partition groove disposed in the first sub-definition layer and a second sub-partition groove disposed in the second sub-definition layer;

wherein an orthographic projection of the second sub-partition groove onto the drive backplane falls within an orthographic projection of the first sub-partition groove onto the drive backplane, and an outer boundary of the orthographic projection of the second sub-partition groove onto the drive backplane is not overlapped with an outer boundary of the orthographic projection of the first sub-partition groove onto the drive backplane.

5 . The display substrate according to claim 4 , wherein a distance between the outer boundary of the orthographic projection of the second sub-partition groove onto the drive backplane and the outer boundary of the orthographic projection of the first sub-partition groove onto the drive backplane ranges from 0.05 μm to 0.1 μm.

6 . The display substrate according to claim 4 , wherein the pixel definition layer further comprises: a third sub-definition layer disposed on a side, proximal to the drive backplane, of the first sub-definition layer;

wherein an orthographic projection of the partition groove onto the drive backplane falls within an orthographic projection of the third sub-definition layer onto the drive backplane;

or alternately, the partition groove further comprises: a third sub-partition groove disposed in the third sub-definition layer, an orthographic projection of the third sub-partition groove onto the drive backplane falls within the orthographic projection of the first sub-partition groove onto the drive backplane, and an outer boundary of the orthographic projection of the third sub-partition groove onto the drive backplane is not overlapped with the outer boundary of the orthographic projection of the first sub-partition groove onto the drive backplane.

7 . The display substrate according to claim 6 , wherein the first sub-definition layer is made of silicon nitride, and the second sub-definition layer and the third sub-definition layer are both made of silicon oxide.

8 . The display substrate according to claim 7 , wherein in a case that the orthographic projection of the partition groove onto the drive backplane falls within the orthographic projection of the third sub-definition layer onto the drive backplane, the pixel definition layer further comprises: a protection layer disposed between the third sub-definition layer and the first sub-definition layer, and the orthographic projection of the partition groove onto the drive backplane falls within an orthographic projection of the protection layer onto the backplane.

9 . The display substrate according to claim 1 , wherein an included angle between a sidewall of the partition groove and a side, proximal to the drive backplane, of the pixel definition layer ranges from 70° to 110°.

10 . The display substrate according to claim 1 , wherein the thickness of the auxiliary support layer is greater than or equal to half of the thickness of the first electrode layer.

11 . The display substrate according to claim 1 , wherein the partition groove is distributed around a periphery of each pixel opening hole.

12 . The display substrate according to claim 1 , wherein a depth of the partition groove ranges from 70 nm to 140 nm, and a minimum width of the partition groove ranges from 200 nm to 700 nm.

13 . The display substrate according to claim 1 , wherein an included angle between a sidewall of the pixel opening hole and a side, proximal to the drive backplane, of the pixel definition layer ranges from 70° to 90°.

14 . The display substrate according to claim 1 , wherein an orthographic projection of each pixel opening hole onto the drive backplane falls within the orthographic projection of the first electrode corresponding to the pixel opening hole onto the drive backplane.

15 . The display substrate according to claim 14 , wherein a distance between an outer boundary of the orthographic projection of each pixel opening hole onto the drive backplane and an outer boundary of the orthographic projection of the first electrode corresponding to the pixel opening hole onto the drive backplane is greater than or equal to 150 nm.

16 . The display substrate according to claim 1 , wherein a thickness of the organic light-emitting layer is greater than or equal to three times a thickness of the pixel definition layer.

17 . The display substrate according to claim 1 , wherein the display substrate further comprises a packaging layer disposed on a side, distal to the drive backplane, of the second electrode layer.

18 . A display device, comprising: a driver chip and a display substrate, wherein the display substrate comprises:

a drive backplane;

a first electrode layer disposed on a side of the drive backplane, wherein the first electrode layer is provided with a plurality of first electrodes electrically connected to the drive backplane;

a pixel definition layer disposed on a side, distal to the drive backplane, of the first electrode layer, wherein the pixel definition layer is provided with a plurality of pixel opening holes in one-to-one correspondence with the plurality of first electrodes and a partition groove disposed between adjacent pixel opening holes, and at least a portion of each first electrode is disposed in the pixel opening hole corresponding to the first electrode;

an organic light-emitting layer disposed on a side, distal to the drive backplane, of the pixel definition layer, wherein the organic light-emitting layer comprises: a plurality of organic material layers stacked in a direction perpendicular to and away from the drive backplane, and a portion of the organic material layer disposed inside the partition groove is separated from a portion of the organic material layer disposed outside the partition groove; and

a second electrode layer disposed on a side, distal to the drive backplane, of the organic light-emitting layer; and the driver chip is configured to apply a control signal to the display substrate;

wherein the display substrate further comprises an auxiliary support layer, wherein the auxiliary support layer and the first electrode layer are arranged on a same layer and are made of different materials, a thickness of the auxiliary support layer being less than or equal to a thickness of the first electrode layer;

wherein the orthographic projection of the partition groove onto the drive backplane falls within an orthographic projection of the auxiliary support layer onto the drive backplane; and

wherein the auxiliary support layer is provided with a plurality of hollow structures in one-to-one correspondence with the plurality of first electrodes, and outer boundaries of orthographic projections of the hollow structures onto the drive backplane are overlapped with outer boundaries of orthographic projections of the first electrodes onto the drive backplane.