Display substrate and preparation method thereof, and display apparatus

1. A display substrate, comprising a base substrate, the base substrate having a display area and an encapsulation area, the encapsulation area surrounding the display area, and a hydrophobic structure being arranged on the encapsulation area,

wherein the hydrophobic structure comprises a plurality of hydrophobic columns arrayed in the encapsulation area, and gaps are arranged between the hydrophobic columns;

wherein height h of the hydrophobic columns and distance d between two adjacent hydrophobic columns satisfy: h/d>0.5, wherein 0.5 microns<h<5 microns; and

wherein the distance d between two adjacent hydrophobic columns is smaller than a size of an ink drop, and the ink drop is separated from a side of the hydrophobic structure away from the base substrate.

2. The display substrate according to claim 1 , wherein the base substrate further has an ink deposition area surrounding the encapsulation area.

3. The display substrate according to claim 2 , further comprising a hydrophobic defining area surrounding the ink deposition area.

4. The display substrate according to claim 1 , wherein the hydrophobic column is a cylinder or a prism.

5. The display substrate according to claim 1 , wherein heights of the hydrophobic columns are identical.

6. The display substrate according to claim 1 , wherein a material of the hydrophobic structure is a hydrophobic organic material.

7. The display substrate according to claim 6 , wherein the material of the hydrophobic structure adopts at least one of polymethyl methacrylate, fluorinated polymethyl methacrylate, polyimide and fluorinated polyimide.

8. The display substrate according to claim 1 , wherein an outer surface of the hydrophobic structure is a rough surface.

9. The display substrate according to claim 8 , wherein the outer surface of the hydrophobic structure is provided with a plurality of holes with a diameter of 300 nm to 800 nm to form the rough surface.

10. The display substrate according to claim 1 , wherein the base substrate further has an edge area, the encapsulation area is located between the display area and the edge area, and a first barricade structure is arranged on the edge area.

11. The display substrate of claim 10 , wherein a material of the first barricade structure is a hydrophobic material.

12. The display substrate according to claim 10 , wherein a second barricade structure is arranged on the display area, and the first barricade structure and the second barricade structure are both barricade structures in a pixel defining layer of the display substrate.

13. The display substrate according to claim 10 , wherein peripheral lines are arranged in the edge area.

14. The display substrate according to claim 1 , wherein a width of the encapsulation area is 1 mm to 3 mm.

15. A display apparatus, comprising the display substrate according to claim 1 .

16. A method for preparing a display substrate, comprising:

providing a base substrate, wherein the base substrate has a display area and an encapsulation area, and the encapsulation area surrounds the display area; and

forming a hydrophobic structure on the encapsulation area,

wherein the hydrophobic structure comprises a plurality of hydrophobic columns arrayed in the encapsulation area, and gaps are arranged between the hydrophobic columns;

wherein height h of the hydrophobic columns and distance d between two adjacent hydrophobic columns satisfy: h/d>0.5, wherein 0.5 microns<h<5 microns; and

wherein the distance d between two adjacent hydrophobic columns is smaller than a size of an ink drop, and the ink drop is separated from a side of the hydrophobic structure away from the base substrate.

17. The method for preparing the display substrate according to claim 16 , wherein after forming the hydrophobic structure on the encapsulation area, the method further comprises:

forming a pixel defining layer on the base substrate on which the hydrophobic structure has been formed;

forming a light emitting functional layer on the display area through an ink jet printing process;

forming a passivation layer on the light emitting functional layer;

forming an encapsulation adhesive layer on the encapsulation area; and

forming an encapsulation layer on the encapsulation adhesive layer.

18. The method for preparing the display substrate according to claim 16 , wherein forming the hydrophobic structure on the encapsulation area comprises:

forming a pixel defining layer on the base substrate, the pixel defining layer comprising a third barricade structure located in the encapsulation area; and

dry etching the third barricade structure to roughen a surface of the third barricade structure to form the hydrophobic structure.