Display substrate, fabricating method thereof and display device

1. A display substrate comprising:

a base substrate comprising a photosensitive region, the photosensitive region comprising a plurality of display regions spaced apart and a gap region between the plurality of display regions;

a first electrode layer on the base substrate;

a light-emitting layer on a side of the first electrode layer away from the base substrate; and

a second electrode layer on a side of the light-emitting layer away from the base substrate;

wherein the light-emitting layer comprises a plurality of first luminescent material regions and a plurality of second luminescent material regions;

wherein each display region corresponds to at least one first luminescent material region;

wherein the gap region corresponds to the plurality of second luminescent material regions;

wherein a portion of the second electrode layer in the photosensitive region comprises a plurality of second electrodes spaced apart from each other and an orthographic projection of each second electrode on the base substrate overlaps with each display region.

2. The display substrate of claim 1 , further comprising:

a plurality of third electrodes, each third electrode being arranged in one of the plurality of display regions;

wherein a top of each third electrode is higher than a top of the light-emitting layer in a direction perpendicular to the base substrate; and

wherein each second electrode is in connection with a portion of each third electrode that is higher than the light-emitting layer.

3. The display substrate of claim 2 , further comprising:

a plurality of support posts in the plurality of display regions;

wherein the plurality of support posts are arranged in a one-to-one correspondence with the plurality of third electrodes; and

wherein each third electrode covers a top surface and a side surface of a corresponding support post of the plurality of support posts.

4. The display substrate of claim 3 , wherein each support post is a cylinder or a polygonal prism.

5. The display substrate of claim 3 , wherein each support post is a truncated cone or a truncated pyramid; and

wherein an angle between a side surface and a bottom surface of each support post is about 5 degrees to about 85 degrees.

6. The display substrate of claim 3 , further comprising:

a planarization layer between the base substrate and the first electrode layer;

wherein the plurality of support posts and the planarization layer are integrated.

7. The display substrate of claim 1 , further comprising:

a non-photosensitive region;

wherein a part of the light-emitting layer in the non-photosensitive region comprises a plurality of third luminescent material regions, a part of the second electrode layer in the non-photosensitive region comprises a sheet electrode, and an orthographic projection of the sheet electrode on the base substrate covers orthographic projections of the plurality of third luminescent material regions on the base substrate.

8. The display substrate of claim 7 , wherein a size of each first luminescent material region in the display region is smaller than a size of each third luminescent material region in the non-photosensitive region.

9. A method for fabricating the display substrate of claim 1 , comprising:

providing a base substrate comprising a photosensitive region, the photosensitive region comprising a plurality of display regions spaced apart and a gap region between the plurality of display regions;

forming a first electrode layer on the base substrate;

forming a light-emitting layer on a side of the first electrode layer away from the base substrate; and

forming a second electrode layer on a side of the light-emitting layer away from the base substrate;

wherein the light-emitting layer comprises a plurality of first luminescent material regions and a plurality of second luminescent material regions; each display region corresponds to at least one first luminescent material region; the gap region corresponds to the plurality of second luminescent material region; a part of the second electrode layer in the photosensitive region comprises a plurality of second electrodes spaced apart, and an orthographic projection of each second electrode on the base substrate overlaps with each display region.

10. The method of claim 9 , further comprising:

forming a plurality of third electrodes in the plurality of display regions before forming the light-emitting layer on the side of the first electrode layer away from the base substrate;

wherein a top of each third electrode is higher than a top of the light-emitting layer in a direction perpendicular to the base substrate, and each second electrode is in connection with a part of each third electrode higher than the light-emitting layer.

11. The method of claim 10 , further comprising:

forming a plurality of support posts before forming the first electrode layer on the base substrate, the plurality of support posts being in one-to-one correspondence with the plurality of third electrodes;

wherein forming the plurality of third electrodes in the plurality of display regions comprises:

forming each of the plurality of third electrodes on a top surface and a side surface of each of the plurality of support posts.

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

a base substrate comprising a photosensitive region, the photosensitive region comprising a plurality of display regions spaced apart and a gap region between the plurality of display regions;

a first electrode layer on the base substrate;

a light-emitting layer on a side of the first electrode layer away from the base substrate; and

a second electrode layer on a side of a light-emitting layer away from the base substrate;

wherein the light-emitting layer comprises a plurality of first luminescent material regions and a plurality of second luminescent material regions;

wherein each display region corresponds to at least one first luminescent material region;

wherein the gap region corresponds to the plurality of second luminescent material regions;

wherein a portion of the second electrode layer in the photosensitive region comprises a plurality of second electrodes spaced apart from each other and an orthographic projection of each second electrode on the base substrate overlaps with each display region.

13. The display device of claim 12 , further comprising:

a plurality of third electrodes, each third electrode being arranged in one of the plurality of display regions;

wherein a top of each third electrode is higher than a top of the light-emitting layer in a direction perpendicular to the base substrate; and

wherein each second electrode is in connection with a portion of each third electrode that is higher than the light-emitting layer.

14. The display device of claim 13 , further comprising:

a plurality of support posts in the plurality of display regions;

wherein the plurality of support posts are arranged in a one-to-one correspondence with the plurality of third electrodes; and

wherein each third electrode covers a top surface and a side surface of a corresponding support post of the plurality of support posts.

15. A display device of claim 14 , wherein each support post is a cylinder or a polygonal prism.

16. The display device of claim 14 , wherein each support post is a truncated cone or a truncated pyramid; and

wherein an angle between a side surface and a bottom surface of each support post is about 5 degrees to about 85 degrees.

17. The display device of claim 14 , further comprising:

a planarization layer between the base substrate and the first electrode layer;

wherein the plurality of support posts and the planarization layer are integrated.

18. The display device of claim 12 , further comprising:

a non-photosensitive region;

wherein a portion of the light-emitting layer in the non-photosensitive region comprises a plurality of third luminescent material regions;

wherein a portion of the second electrode layer in the non-photosensitive region comprises a sheet electrode; and

wherein an orthographic projection of the sheet electrode on the base substrate covers orthographic projections of the plurality of third luminescent material regions on the base substrate.

19. The display device of claim 18 , wherein an area of each first luminescent material region in the display region is smaller than an area of each third luminescent material region in the non-photosensitive region.