Flexible supporting layer and flexible display device

1. A flexible supporting layer, applied in a flexible display apparatus, wherein:

in a curl direction of the flexible display apparatus, a content of a material of the flexible supporting layer per unit volume increases.

2. The flexible supporting layer according to claim 1 , wherein:

the flexible supporting layer is provided with a plurality of grooves, and in the curl direction of the flexible display apparatus, a proportion of grooves per unit volume decreases.

3. The flexible supporting layer according to claim 2 , wherein:

the plurality of grooves are arranged in an array, all the plurality of grooves are of a same size, and in the curl direction of the flexible display apparatus, a quantity of the grooves per unit volume decreases.

4. The flexible supporting layer according to claim 2 , wherein:

the plurality of grooves are arranged in an array; and

in the curl direction of the flexible display apparatus, a quantity of the grooves per unit volume is the same, and sizes of the grooves in different unit volumes decrease.

5. The flexible supporting layer according to claim 4 , wherein:

depths of all the plurality of grooves are the same; and

in the curl direction of the flexible display apparatus, lengths of the grooves in different unit volumes are the same, and widths of the grooves in different unit volumes decrease.

6. The flexible supporting layer according to claim 4 , wherein:

depths of all the plurality of grooves are the same; and

in the curl direction of the flexible display apparatus, lengths of the grooves in different unit volumes decrease, and widths of the grooves in different unit volumes are the same.

7. The flexible supporting layer according to claim 5 , wherein the plurality of grooves are a plurality of vias penetrating through the flexible supporting layer.

8. The flexible supporting layer according to claim 2 , wherein in the curl direction of the flexible display apparatus, lengths and widths of the plurality of grooves are the same, and depths of the grooves in different unit volumes decrease.

9. The flexible supporting layer according to claim 1 , wherein shapes of the plurality of grooves comprise a rectangle, a square, a circle, an ellipse or an irregular shape.

10. The flexible supporting layer according to claim 1 , wherein a material of the flexible supporting layer is metal, and the metal is a stainless steel or a shape memory alloy.

11. A flexible display apparatus, comprising:

a flexible substrate;

a flexible display device, arranged on the flexible substrate; and

a flexible supporting layer, arranged on a side of the flexible substrate facing away from the flexible display device;

wherein in a curl direction of the flexible display apparatus, a content of a material of the flexible supporting layer per unit volume increases.

12. The flexible display apparatus according to claim 11 , further comprising: a drive circuit layer arranged between the flexible display device and the flexible substrate, a back film arranged between the flexible substrate and the flexible supporting layer, and an encapsulation layer, a first adhesive layer, a polarizer, a touch layer, a second adhesive layer and a cover plate which are stacked in sequence and arranged on a side of the flexible display device facing away from the flexible substrate.

13. The flexible display apparatus according to claim 11 , wherein:

the flexible supporting layer is provided with a plurality of grooves, and in the curl direction of the flexible display apparatus, a proportion of grooves per unit volume decreases.

14. The flexible display apparatus according to claim 13 , wherein:

the plurality of grooves are arranged in an array, all the plurality of grooves are of a same size, and in the curl direction of the flexible display apparatus, a quantity of the grooves per unit volume decreases.

15. The flexible display apparatus according to claim 13 , wherein:

the plurality of grooves are arranged in an array; and

in the curl direction of the flexible display apparatus, a quantity of the grooves per unit volume is the same, and sizes of the grooves in different unit volumes decrease.

16. The flexible display apparatus according to claim 15 , wherein:

depths of all the plurality of grooves are the same; and

in the curl direction of the flexible display apparatus, lengths of the grooves in different unit volumes are the same, and widths of the grooves in different unit volumes decrease.

17. The flexible display apparatus according to claim 15 , wherein:

depths of all the plurality of grooves are the same; and

in the curl direction of the flexible display apparatus, lengths of the grooves in different unit volumes decrease, and widths of the grooves in different unit volumes are the same.

18. The flexible display apparatus according to claim 17 , wherein the plurality of grooves are a plurality of vias penetrating through the flexible supporting layer.

19. The flexible display apparatus according to claim 13 , wherein in the curl direction of the flexible display apparatus, lengths and widths of the plurality of grooves are the same, and depths of the grooves in different unit volumes decrease.

20. The flexible display apparatus according to claim 11 , wherein shapes of the plurality of grooves comprise a rectangle, a square, a circle, an ellipse or an irregular shape.