Pixel definition layer having an incline for an organic light emitting device

1. A substrate for an organic light-emitting device, comprising:

a base substrate;

a pixel definition layer on the base substrate, wherein the pixel definition layer defines a plurality of pixel regions, the pixel definition layer comprises a top opening and a lower opening along a thickness direction of the base substrate corresponding to each of the pixel regions, the lower opening is in the top opening so that the pixel definition layer comprises a slope extending from the top opening to the lower opening corresponding to each of the pixel regions, and boundaries of the top openings adjacent to each other are straight lines;

an organic light-emitting device in each of the pixel regions; and

spacers spaced apart from each other on the pixel definition layer,

wherein the slope extending from one of the boundaries to the lower opening corresponding to each of the pixel regions protrudes toward the base substrate, and is in a shape of a smooth arc; and tangents of the smooth arc have a slope which gradually decreases in absolute value from the one of the boundaries to the lower opening;

a first portion of the pixel definition layer has a flat surface which is directly contacted with the spacers; and

a second portion of the pixel definition layer is the boundaries of the top openings intersected with each other and between two adjacent spacers.

2. The substrate for an organic light-emitting device according to claim 1 , wherein the organic light-emitting device comprises an anode, an organic light-emitting layer and a cathode, the pixel definition layer is on the anode, and the anode is partially exposed by the lower opening in each of the pixel regions.

3. The substrate for an organic light-emitting device according to claim 2 , wherein cathodes of organic light-emitting devices in the pixel regions adjacent to each other are electrically connected to each other.

4. The substrate for an organic light-emitting device according to claim 2 , wherein a slope angle of the slope of the pixel definition layer in each of the pixel regions ranges from 5 degrees to 25 degrees.

5. The substrate for an organic light-emitting device according to claim 2 , wherein a slope angle of the slope of the pixel definition layer in each of the pixel regions ranges from 5 degrees to 25 degrees.

6. The substrate for an organic light-emitting device according to claim 1 , wherein a slope angle of the slope of the pixel definition layer corresponding to in each of the pixel regions ranges from 5 degrees to 25 degrees.

7. The substrate for an organic light-emitting device according to claim 1 , wherein the organic light-emitting device is configured to emit at least one of red light, green light or blue light.

8. The substrate for an organic light-emitting device according to claim 1 , wherein the spacers are symmetrical with respect to positions of the boundaries of the top openings adjacent to each other.

9. The substrate for an organic light-emitting device according to claim 1 , further comprising a driving circuit layer, wherein the driving circuit layer comprises driving transistors, and each of the driving transistors is electrically connected with the organic light-emitting device in each of the pixel regions correspondingly to drive the organic light-emitting device.

10. An organic light-emitting display device, comprising the substrate for an organic light-emitting device according to claim 1 .

11. The substrate for an organic light-emitting device according to claim 2 , wherein the organic light-emitting device is configured to emit at least one of red light, green light or blue light.

12. A manufacturing method of a substrate for an organic light-emitting device, comprising:

providing a base substrate;

forming a pixel definition layer on the base substrate, wherein the pixel definition layer defines a plurality of pixel regions, the pixel definition layer comprises a top opening and a lower opening along a thickness direction of the base substrate corresponding to each of the pixel regions, the lower opening is formed in the top opening so that the pixel definition layer comprises a slope extending from the top opening to the lower opening corresponding to each of the pixel regions, and boundaries of the top openings adjacent to each other are straight lines;

forming an organic light-emitting device in each of the pixel regions;

forming spacers spaced apart from each other on the pixel definition layer,

wherein the slope extending from one of the boundaries to the lower opening corresponding to each of the pixel regions protrudes toward the base substrate, and is in a shape of a smooth arc; and tangents of the smooth arc have a slope which gradually decreases in absolute value from the one of the boundaries to the lower opening;

a first portion of the pixel definition layer has a flat surface which is directly contacted with the spacers;

a second portion of the pixel definition layer is the boundaries of the top openings intersected with each other and between two adjacent spacers.

13. The manufacturing method according to claim 12 , wherein the organic light-emitting device comprises an anode, an organic light-emitting layer and a cathode, the pixel definition layer is on the anode, and the anode is partially exposed by the lower opening in each of the pixel regions.

14. The manufacturing method according to claim 13 , wherein the anode, the organic light-emitting layer, and the cathode of the organic light-emitting device are formed in this order in each of the pixel regions.

15. The manufacturing method according to claim 12 , wherein the pixel definition layer is formed on the base substrate in an exposure mode by using a plurality of masks with different gray scales, so that each of the pixel regions comprises the slope extending from the top opening to the lower opening.

16. The manufacturing method according to claim 12 , wherein an anode, an organic light-emitting layer, and a cathode of the organic light-emitting device are formed in this order in each of the pixel regions.

17. The manufacturing method according to claim 16 , wherein the organic light-emitting layer is formed by evaporating with an evaporation mask, and an opening of the evaporation mask is identical to or is substantially identical to the top opening of each of the pixel regions.