Display substrate and manufacturing method therefor, and display device

A method for manufacturing a display substrate, the display substrate comprising a stretchable area, the stretchable area comprising a plurality of pixel island areas spaced apart from each other, a plurality of hole areas, and connection bridge areas located between the pixel island areas and the hole areas, each of the hole area being provided with one or more apertures which penetrate through or do not penetrate through a base substrate, wherein the method comprises:

• forming a composite structural layer on the base substrate of the hole areas, wherein the base substrate comprises a flexible layer and a barrier layer that are stacked, the composite structural layer comprises an inorganic composite insulating layer provided on the barrier layer and an organic composite layer provided on the inorganic composite insulating layer;
• forming a first opening on the organic composite layer, wherein the first opening exposes a surface of the inorganic composite insulating layer;
• forming a second opening on a portion of the inorganic composite insulating layer exposed by the first opening, wherein the second opening penetrates through the barrier layer and exposes a surface of the flexible layer;
• forming a third opening on the flexible layer, wherein the third opening penetrates through or does not penetrate through the flexible layer, an orthographic projection of the third opening on the base substrate comprises an orthographic projection of the second opening on the base substrate, the first opening, the second opening, and the third opening form an aperture, the third opening forms a separation groove with respect to an enlarged portion of the second opening in a direction parallel to the base substrate, and the separation groove is provided on a wall of the aperture;
• and
• forming a functional film layer on the composite structural layer, wherein the functional film layer is provided on the wall of the aperture and is separated at the separation groove.