DISPLAY SUBSTRATE AND METHOD OF ITS MANUFACTURING AND DISPLAY DEVICE

Claims

1. A display substrate comprising a base substrate, a plurality of first electrodes, and a plurality of pixel definition structures disposed on the base substrate, wherein the pixel definition structures are disposed between adjacent first electrodes and form pixel openings exposing the first electrodes;wherein in the direction perpendicular to the base substrate, the pixel defining structure comprises at least a first insulating layer located on the base substrate, a second insulating layer located on the side of the first insulating layer remote from the base substrate, a third insulating layer located on the side of the second insulating layer remote from the base substrate, and a fourth insulating layer located on the side of the third insulating layer remote from the base substrate, the orthogonal projections of the first insulating layer, the third insulating layer and the fourth insulating layer onto the base substrate do not overlap the orthogonal projection of the first electrode onto the base substrate, and the orthogonal projection of the second insulating layer onto the base substrate at least partially overlaps the orthogonal projection of the first electrode onto the base substrate;wherein the surface of the second insulating layer, remote from the base substrate, is provided with a second recess, recessed in the direction towards the base substrate, and the inner wall of the second recess on the side close to the base substrate is located between the surface of the first electrode on the side remote from the base substrate, and the surface of the first electrode on the side close to the base substrate.

2. The display substrate according to claim 1, wherein the second depth of the second recess is from 0.01 μm to 0.06 μm, and the second depth has a maximum distance between the inner wall of the second recess on the side close to the base substrate and the surface of the second insulating layer on the side remote from the base substrate.

3. The display substrate according to claim 1, in which the surface of the first insulating layer on the side remote from the base substrate is at the same level as the surface of the first electrode on the side remote from the base substrate, or the surface of the first insulating layer on the side remote from the base substrate is below the surface of the first electrode on the side remote from the base substrate.

4. The display substrate of claim 1, wherein the first insulating layer has a first width, the second insulating layer has a second width, wherein the second width is greater than the first width, and the first width and the second width are dimensions parallel to the base substrate.

5. The display substrate of claim 4, wherein the difference between the second width and the first width is greater than or equal to 0.1 μm.

6. The display substrate according to claim 1, wherein the material of the third insulating layer is different from the material of the fourth insulating layer, and the material of the second insulating layer is the same as the material of the fourth insulating layer.

7. The display substrate of claim 4, wherein the third insulating layer has a third width, the fourth insulating layer has a fourth width, the fourth width is less than the second width, the fourth width is less than the first width, the third width is less than the fourth width, and the third width and the fourth width are dimensions in a direction parallel to the base substrate.

8. The display substrate according to claim 7, wherein the difference between the fourth width and the second width is greater than or equal to 0.3 μm, and the difference between the fourth width and the third width is from 0.1 μm to 0.4 μm.

9. The display substrate according to claim 2, in which the fourth insulating layer has a protrusion relative to the side wall of the third insulating layer, and the protrusion and the side wall of the third insulating layer form a first recess, deepened in the direction from the pixel hole, wherein the first depth of the first recess is greater than the second depth of the second recess, wherein the first depth has a maximum distance between the side wall of the fourth insulating layer on the side close to the pixel hole, and the side wall of the third insulating layer on the side close to the pixel hole.

10. The display substrate of claim 9, wherein the first depth of the first recess is from 0.05 μm to 0.2 μm.

11. The display substrate according to claim 9, wherein the first height of the first recess is greater than the second depth of the second recess, and the first height of the first recess has a maximum distance between the surface of the first recess on the side close to the base substrate and the surface of the first recess on the side remote from the base substrate.

12. The display substrate according to claim 11, in which the surface of the fourth insulating layer on the side remote from the base substrate is provided with a third recess, smoothly deepened in the direction towards the base substrate.

13. The display substrate according to claim 12, wherein the curvature of the third recess is less than the curvature of the first recess or the curvature of the second recess.

14. A display substrate according to any one of claims 1 to 13, wherein the display substrate also comprises an organic light-emitting layer located on the side of the first electrodes and pixel detection structures remote from the base substrate, wherein the organic light-emitting layer comprises a plurality of film layers, at least one film layer has a gap at the edge of the fourth insulating layer, and the film layer of the organic light-emitting layer is provided with a deformation region at the location of the gap.

15. The display substrate according to claim 14, wherein the deformation region comprises at least one crack, and the orthogonal projection of the deformation region onto the base substrate does not overlap the orthogonal projection of the pixel openings onto the base substrate.

16. The display substrate of claim 15, wherein the display substrate further comprises a second electrode located on the side of the organic light-emitting layer remote from the base substrate, the second electrode being provided with a puncture tip located in the crack in the deformation region, and the orthogonal projection of the puncture tip onto the base substrate does not overlap the orthogonal projection of the first electrode onto the base substrate; and wherein the orthogonal projection of the end point of the puncture tip onto the base substrate is located within the orthogonal projection of the first insulating layer onto the base substrate, and the end point of the puncture tip is a boundary point closest to the base substrate on the puncture tip.

17. The display substrate of claim 14, wherein the organic light-emitting layer comprises a first device, a charge generation layer, and a second device arranged one above the other, wherein the first device and the charge generation layer have a thickness of the first device, the second device has a thickness of the second device, wherein the thickness of the first device is less than the thickness of the second device, and the thickness of the first device and the thickness of the second device are dimensions in a direction perpendicular to the base substrate.

18. The display substrate of claim 17, wherein the thickness of the first device is less than 1 / 2 the thickness of the second device.

19. The display substrate according to claim 17, wherein the third insulating layer has a third thickness D3, wherein the third thickness D3 is a dimension in a direction perpendicular to the base substrate, the third thickness is less than the thickness of the first device, and the third thickness is greater than 1 / 2 the thickness of the first device.

20. A display device comprising a display substrate according to any one of claims 1 to 19.

21. A method for manufacturing a display substrate, characterized in that a plurality of first electrodes and a plurality of pixel definition structures are formed on a base substrate, wherein the pixel definition structures are located between adjacent first electrodes and form pixel openings that expose the first electrodes;wherein in the direction perpendicular to the base substrate, the pixel defining structure comprises at least a first insulating layer located on the base substrate, a second insulating layer located on the side of the first insulating layer remote from the base substrate, a third insulating layer located on the side of the second insulating layer remote from the base substrate, and a fourth insulating layer located on the side of the third insulating layer remote from the base substrate, the orthogonal projections of the first insulating layer, the third insulating layer and the fourth insulating layer onto the base substrate do not overlap the orthogonal projection of the first electrode onto the base substrate, and the orthogonal projection of the second insulating layer onto the base substrate at least partially overlaps the orthogonal projection of the first electrode onto the base substrate;wherein the surface of the second insulating layer, remote from the base substrate, is provided with a second recess, recessed in the direction towards the base substrate, and the inner wall of the second recess on the side close to the base substrate is located between the surface of the first electrode on the side remote from the base substrate, and the surface of the first electrode on the side close to the base substrate.