Display substrate and manufacturing method thereof, and display device

1. A display substrate, comprising:

a stretchable base substrate;

a display functional layer on the stretchable base substrate, the display functional layer comprising a plurality of pixel structures spaced apart from each other, each of the pixel structures comprising at least one inorganic insulation layer; the pixel structure having an upper surface distal to the stretchable base substrate and a first lateral surface connected between the upper surface and the stretchable base substrate; and

a protection layer covering at least a portion of the first lateral surface of at least one pixel structure of the plurality of pixel structures corresponding to the inorganic insulation layer;

the display functional layer further comprises a connection structure connected between every two adjacent pixel structures of the plurality of pixel structures, and

the plurality of pixel structures spaced apart from each other and the connection structure connected between every two adjacent pixel structures define a plurality of vias, and each of the vias extends to penetrate the stretchable base substrate.

2. The display substrate of claim 1 , wherein the connection structure comprises the at least one inorganic insulation layer,

the connection structure has an upper surface distal to the stretchable base substrate and a second lateral surface connected between the upper surface and the stretchable base substrate, and the protection layer further covers at least a portion of the second lateral surface of the connection structure corresponding to the inorganic insulation layer.

3. The display substrate of claim 2 , wherein the upper surface of each of the at least one pixel structure comprises a first electrode pattern region and a first edge region located around the first electrode pattern region, the upper surface of the connection structure comprises a second electrode pattern region and a second edge region located around the second electrode pattern region, the first edge region is connected to the first lateral surface, and the second edge region is connected to the second lateral surface; and

the protection layer covers the first edge region and the entire first lateral surface of the pixel structure, and covers the second edge region and the entire second lateral surface of the connection structure.

4. The display substrate of claim 1 , wherein each of the at least one pixel structure further comprises a thin film transistor, the thin film transistor comprises a gate, an active layer, a source and a drain, and at least a portion of the protection layer is provided in a same layer as the source and the drain of the thin film transistor and is formed by a same material as the source and the drain of the thin film transistor.

5. The display substrate of claim 4 , wherein all of the protection layer is provided in a same layer as the source and the drain of the thin film transistor and is formed by a same material as the source and the drain of the thin film transistor; or

a first portion of all of the protection layer is provided in a same layer as the source and the drain of the thin film transistor and is formed by a same material as the source and the drain of the thin film transistor, while a second portion of all of the protection layer is provided in a same layer as the gate of the thin film transistor and is formed by a same material as the gate of the thin film transistor.

6. The display substrate of claim 1 , wherein a toughness of the protection layer is greater than that of the at least one inorganic insulation layer.

7. A display device comprising the display substrate of claim 1 and an encapsulation structure which is aligned and assembled with the display substrate to form a cell.

8. A manufacturing method of a display substrate, comprising:

providing a stretchable base substrate;

forming a display functional layer on the stretchable base substrate, which comprises forming a plurality of pixel structures spaced apart from each other, each of the pixel structure comprising at least one inorganic insulation layer; the pixel structure having an upper surface distal to the stretchable base substrate and a first lateral surface connected between the upper surface and the stretchable base substrate; and

forming a protection layer such that the protection layer covers at least a portion of the first lateral surface of at least one pixel structure of the plurality of pixel structures corresponding to the inorganic insulation layer,

the forming the display functional layer on the stretchable base substrate further comprises: forming a connection structure connected between every two adjacent pixel structures of the plurality of pixel structures;

the forming the plurality of pixel structures spaced apart from each other and forming the connection structure connected between every two adjacent pixel structures comprises defining a plurality of vias on the stretchable base substrate between the plurality of pixel structures and the connection structures connected between every two adjacent pixel structures; and

after forming the protection layer, the manufacturing method further comprises making the plurality of vias further extend to penetrate the stretchable base substrate.

9. The manufacturing method of claim 8 , wherein the connection structure comprises the at least one inorganic insulation layer, the connection structure has an upper surface distal to the stretchable base substrate and a second lateral surface connected between the upper surface and the stretchable base substrate; and

the forming the protection layer further comprises: forming the protection layer such that the protection layer further covers at least a portion of the second lateral surface of the connection structure corresponding to the inorganic insulation layer.

10. The manufacturing method of claim 9 , wherein the forming the display functional layer on the stretchable base substrate further comprises forming a first electrode pattern region and a first edge region located around the first electrode pattern region on the upper surface of each of the at least one pixel structure, and forming a second electrode pattern region and a second edge region located around the second electrode pattern region on the upper surface of the connection structure, the first edge region is connected to the first lateral surface, and the second edge region is connected to the second lateral surface; and

forming the protection layer so as to cover the first edge region and the entire first lateral surface of the pixel structure, and cover the second edge region and the entire second lateral surface of the connection structure.

11. The manufacturing method of claim 8 , wherein the forming the pixel structure further comprises: forming a thin film transistor, the thin film transistor comprises a gate, an active layer, a source and a drain, a first inorganic insulation layer in the at least one inorganic insulation layer is provided between a layer in which the active layer is located and a layer in which the gate is located; and

at least a portion of the protection layer is formed by a same patterning process as the source and the drain of the thin film transistor.

12. The manufacturing method of claim 11 , wherein the forming at least a portion of the protection layer by the same patterning process as the source and the drain of the thin film transistor comprises:

forming a source-drain metal layer on the first inorganic insulation layer, and performing a patterning process on the source-drain metal layer to form the source, the drain, and at least a portion of the protection layer.

13. The manufacturing method of claim 11 , wherein a second inorganic insulation layer in the at least one inorganic insulation layer is formed between the layer in which the gate is located and the stretchable base substrate; and

the entire protection layer and the source and the drain of the thin film transistor are formed by a same patterning process; or, a first portion of the protection layer is formed by a same patterning process as the source and the drain of the thin film transistor while a second portion of the protection layer are formed by a same patterning process as the gate of the thin film transistor.

14. The manufacturing method of claim 13 , wherein the forming the first portion of the protection layer by a same patterning process as the source and the drain of the thin film transistor while forming a second portion of the protection layer by a same patterning process as the gate of the thin film transistor comprises:

forming a first gate metal layer on the second inorganic insulation layer, and performing a patterning process on the first gate metal layer to form the gate and the second portion of the protection layer; and

forming a source-drain metal layer on the first inorganic insulation layer, and performing a patterning process on the source-drain metal layer to form the source, the drain, and the first portion of the protection layer.

15. The manufacturing method of claim 8 , wherein a toughness of the protection layer is formed to be greater than that of the at least one inorganic insulation layer.