OLED device, manufacturing method thereof, and display apparatus

1. An OLED device, comprising:

a first substrate;

at least one auxiliary electrode disposed on the first substrate;

a pixel defining structure disposed on the first substrate; and

a plurality of light emitting units disposed on the first substrate,

wherein each of the plurality of light emitting units comprises a first electrode, a second electrode and a light emitting layer, and the first electrode is located on a side of the second electrode distal to the first substrate, and the light emitting layer is located between the first electrode and the second electrode;

the at least one auxiliary electrode is disposed inside the pixel defining structure and electrically coupled to the first electrode; and

in a direction parallel to an extension direction of the first substrate, the second electrode and the light emitting layer are disposed in a pixel region defined by the pixel defining structure, and the first electrode covers the pixel defining structure, the at least one auxiliary electrode, and the light emitting layer;

the OLED device further comprises:

a second substrate opposite to the first substrate;

a plurality of spacers disposed on the second substrate on a side proximal to the first substrate; and

a plurality of connection structures which are electrically conductive and respectively disposed on the plurality of spacers on a side proximal to the first substrate,

wherein the connection structure is in contact with a corresponding auxiliary electrode by passing through the first electrode and the pixel defining structure and the auxiliary electrode is electrically coupled to the first electrode.

2. The OLED device according to claim 1 , wherein the first electrode is made of a transparent conducting oxide, and the auxiliary electrode is made of metal.

3. The OLED device according to claim 1 , wherein in a direction perpendicular to the extension direction of the first substrate, each of the plurality of spacers has a height h 1 , each of the plurality of connection structures has a height h 2 , and a sum of h 1 and h 2 is in a range from 2.5 μm to 5 μm.

4. The OLED device according to claim 1 , wherein an end of the connection structure in contact with the auxiliary electrode is pointed.

5. The OLED device according to claim 1 , wherein a surface of the connection structure in contact with a corresponding spacer is planar, and a surface of the spacer in contact with a corresponding connection structure is planar.

6. The OLED device according to claim 1 , wherein each of the plurality of connection structures comprises a fixing pillar protruding from a surface of the connection structure in contact with a corresponding spacer, the fixing pillar is inserted into a hole corresponding to the fixing pillar, and the hole is provided in a surface of the corresponding spacer in contact with the connection structure.

7. The OLED device according to claim 1 , wherein the plurality of connection structures are made of metal.

8. A method of manufacturing an OLED device, comprising:

forming at least one auxiliary electrode and a pixel defining structure on a first substrate;

then forming a plurality of light emitting units on the first substrate,

wherein the at least one auxiliary electrode is disposed inside the pixel defining structure;

each of the plurality of light emitting units comprises a first electrode, a second electrode and a light emitting layer, and in a direction perpendicular to an extension direction of the first substrate, the first electrode is located on a side of the second electrode distal to the first substrate, and the light emitting layer is located between the first electrode and the second electrode; and

in a direction parallel to the extension direction of the first substrate, the second electrode and the light emitting layer are disposed in a pixel region defined by the pixel defining structure, and the first electrode covers the pixel defining structure, the at least one auxiliary electrode, and the light emitting layer;

wherein after forming a plurality of light emitting units, the method further comprises:

forming a plurality of spacers on a second substrate,

forming a plurality of conductive connection structures on a side of the plurality of spacers distal to the second substrate, respectively:

then aligning and assembling the second substrate with the first substrate such that the connection structure is in contact with a corresponding auxiliary electrode by passing through the first electrode and the pixel defining structure, and the auxiliary electrode is electrically coupled to the first electrode.

9. The method of manufacturing an OLED device according to claim 8 , wherein forming at least one auxiliary electrode and a pixel defining structure on a first substrate comprises:

forming a TFT and a first planarization layer on the first substrate;

then forming a metal layer on the first substrate by a sputtering process, and performing photoresist coating, exposure, development and etching on the metal layer to form the at least one auxiliary electrode made of metal; and

then forming the pixel defining structure on the first substrate such that the auxiliary electrode is disposed inside the pixel defining structure.

10. A display apparatus, comprising the OLED device according to claim 1 .

11. The OLED device according to claim 2 , wherein in a direction perpendicular to the extension direction of the first substrate, each of the plurality of spacers has a height h 1 , each of the plurality of connection structures has a height h 2 , and a sum of h 1 and h 2 is in a range from 2.5 μm to 5 μm.

12. The OLED device according to claim 2 , wherein an end of the connection structure in contact with the auxiliary electrode is pointed.

13. The OLED device according to claim 2 , wherein a surface of the connection structure in contact with a corresponding spacer is planar, and a surface of the spacer in contact with a corresponding connection structure is planar.

14. The OLED device according to claim 2 , wherein each of the plurality of connection structures comprises a fixing pillar protruding from a surface of the connection structure in contact with a corresponding spacer, the fixing pillar is inserted into a hole corresponding to the fixing pillar, and the hole is provided in a surface of the corresponding spacer in contact with the connection structure.

15. The OLED device according to claim 2 , wherein the plurality of connection structures are made of metal.

16. The OLED device according to claim 3 , wherein an end of the connection structure in contact with the auxiliary electrode is pointed.

17. The OLED device according to claim 3 , wherein a surface of the connection structure in contact with a corresponding spacer is planar, and a surface of the spacer in contact with a corresponding connection structure is planar.

18. The OLED device according to claim 3 , wherein each of the plurality of connection structures comprises a fixing pillar protruding from a surface of the connection structure in contact with a corresponding spacer, the fixing pillar is inserted into a hole corresponding to the fixing pillar, and the hole is provided in a surface of the corresponding spacer in contact with the connection structure.

19. The OLED device according to claim 3 , wherein the plurality of connection structures are made of metal.