Organic light emitting diode array substrate, display panel and display apparatus, and fabricating method thereof

1. An organic light emitting diode array substrate having a subpixel region and an inter-subpixel region;

wherein the organic light emitting diode array substrate in the inter-subpixel region comprises:

a first base substrate;

a pixel definition layer on the first base substrate for defining a plurality of subpixels;

a spacer layer on a side of the pixel definition layer distal to the first base substrate;

an auxiliary electrode layer on a side of the spacer layer distal to the pixel definition layer; and

a second electrode layer on a side of the auxiliary electrode layer distal to the spacer layer and is electrically connected to the auxiliary electrode layer;

wherein the organic light emitting diode array substrate in the subpixel region comprises:

the first base substrate;

a first electrode layer on the first base substrate;

an organic light emitting layer on a side of the first electrode layer distal to the first base substrate; and

the second electrode layer on a side of the organic light emitting layer distal to the first electrode layer;

wherein the spacer layer comprises a plurality of spacer blocks, each of which is on a side of the pixel definition layer distal to the first base substrate;

the auxiliary electrode layer comprises a plurality of auxiliary electrode blocks, each of which is on a side of one of the plurality of spacer blocks distal to the pixel definition layer;

the organic light emitting layer extends into the inter-subpixel region and is between the second electrode layer and one of the plurality of auxiliary electrode blocks in the inter-subpixel region;

the organic light emitting diode array substrate comprises a plurality of vias extending through the organic light emitting layer in the inter-subpixel region; and

the one of the plurality of auxiliary electrode blocks in the inter-subpixel region is electrically connected to the second electrode layer through the plurality of vias.

2. The organic light emitting diode array substrate of claim 1 , wherein orthographic projections of the spacer layer and the auxiliary electrode layer on the pixel definition layer at least partially overlap with each other.

3. The organic light emitting diode array substrate of claim 1 , wherein an orthographic projection of the auxiliary electrode layer on the pixel definition layer substantially covers an orthographic projection of the spacer layer on the pixel definition layer.

4. The organic light emitting diode array substrate of claim 1 , wherein the one of the plurality of auxiliary electrode blocks comprises a plurality of protrusions on a side proximal to the second electrode layer and distal to the first base substrate; and

the plurality of protrusions respectively protrude through the plurality of vias in the organic light emitting layer in the inter-subpixel region thereby electrically connecting the second electrode layer and the one of the plurality of auxiliary electrode blocks.

5. The organic light emitting diode array substrate of claim 4 , wherein average dimensions of the plurality of protrusions are in a range of approximately 10 nm to approximately 100 nm.

6. The organic light emitting diode array substrate of claim 1 , wherein an orthographic projection of each of the plurality of auxiliary electrode blocks on the pixel definition layer at least partially overlaps with an orthographic projection of one of the plurality of spacer blocks on the pixel definition layer.

7. The organic light emitting diode array substrate of claim 1 , wherein an orthographic projection of each of the plurality of auxiliary electrode blocks on the pixel definition layer substantially covers an orthographic projection of one of the plurality of spacer blocks on the pixel definition layer.

8. The organic light emitting diode array substrate of claim 1 , wherein the second electrode layer comprises a substantially transparent electrode material; and

the auxiliary electrode layer comprises a metallic material.

9. An organic light emitting diode display panel, comprising an organic light emitting diode array substrate having a subpixel region and an inter-subpixel region; and

a counter substrate facing the organic light emitting diode array substrate;

wherein the organic light emitting diode array substrate in the inter-subpixel region comprises:

a first base substrate;

a pixel definition layer on the first base substrate for defining a plurality of subpixels;

a spacer layer on a side of the pixel definition layer distal to the first base substrate;

an auxiliary electrode layer on a side of the spacer layer distal to the pixel definition layer; and

a second electrode layer on a side of the auxiliary electrode layer distal to the spacer layer and is electrically connected to the auxiliary electrode layer;

wherein the spacer layer is configured to maintain a spacing between the organic light emitting diode array substrate and the counter substrate;

the spacer layer comprises a plurality of spacer blocks, each of which is on a side of the pixel definition layer distal to the first base substrate; and

the auxiliary electrode layer comprises a plurality of auxiliary electrode blocks, each of which is on a side of one of the plurality of spacer blocks distal to the pixel definition layer;

wherein the counter substrate comprises:

a second base substrate; and

an overcoat layer on the second base substrate;

wherein the overcoat layer is direct contact with the organic light emitting diode array substrate in each of a plurality of regions having the plurality of spacer blocks.

10. The organic light emitting diode display panel of claim 9 , wherein the overcoat layer is in direct contact with the second electrode layer in each of the plurality of regions having the plurality of spacer blocks.

11. An organic light emitting diode display apparatus, comprising the organic light emitting diode display panel of claim 9 .

12. A method of fabricating an organic light emitting diode display panel, comprising forming an organic light emitting diode array substrate having a subpixel region and an inter-subpixel region;

wherein forming the organic light emitting diode array substrate in the inter-subpixel region comprises:

forming a pixel definition layer on a first base substrate for defining a plurality of subpixels;

forming a spacer layer on a side of the pixel definition layer distal to the first base substrate;

forming an auxiliary electrode layer on a side of the spacer layer distal to the pixel definition layer; and

forming a second electrode layer on a side of the auxiliary electrode layer distal to the spacer layer and is electrically connected to the auxiliary electrode layer;

wherein forming the spacer layer comprises forming a plurality of spacer blocks on the pixel definition layer;

forming the auxiliary electrode layer comprises:

forming an electrode material layer on a side of the spacer layer distal to the first base substrate; and

forming a plurality of protrusions on a surface of the electrode material layer distal to the first base substrate.

13. The method of claim 12 , wherein forming the plurality of protrusions comprises dry etching a surface of the electrode material layer.

14. The method of claim 12 , subsequent to forming the plurality of protrusions, further comprising patterning the electrode material layer to form a plurality of auxiliary electrode blocks thereby forming the auxiliary electrode layer.

15. The method of claim 14 , wherein forming the organic light emitting diode array substrate in the subpixel region comprises:

forming a first electrode layer on the first base substrate;

forming an organic light emitting layer on a side of the first electrode layer distal to the first base substrate; and

forming the second electrode layer on a side of the organic light emitting layer distal to the first electrode layer;

wherein the organic light emitting layer is formed to extend into the inter-subpixel region and is formed between the second electrode layer and one of the plurality of auxiliary electrode blocks in the inter-subpixel region.

16. The method of claim 15 , further comprising forming a counter substrate; and

assembling the organic light emitting diode array substrate and the counter substrate together;

wherein assembling the organic light emitting diode array substrate and the counter substrate together comprises pressing the organic light emitting diode array substrate and the counter substrate against each other; and

the plurality of protrusions penetrate through the organic light emitting layer during pressing, thereby increasing contact and electrical connection between the auxiliary electrode layer and the second electrode layer.