Display substrate and manufacturing method therefor, and display device

A manufacturing method for a display substrate, wherein the display substrate comprises a plurality of island areas spaced apart from each other, a plurality of hole areas, and bridge areas for connecting adjacent island areas, the hole area comprises one or more openings penetrating the display substrate, the manufacturing method comprising:

• forming a base substrate of the display substrate on a hard carrier plate;
• forming a composite structure layer on the base substrate of an edge area of the island area adjacent to the hole area, wherein a stepped structure is formed at a side surface of the composite structure layer towards the hole areas, the height of steps in the stepped structure gradually decreases along a direction towards the hole area, a first step with the lowest height in the stepped structure comprises the base substrate, and a side surface of the first step towards the hole area is a first step side surface;
• forming an inorganic encapsulation thin film in the edge area and on a surface of the hard carrier plate exposed by the hole area, wherein the inorganic encapsulation thin film is disposed on the composite structure layer and on the stepped structure;
• removing the inorganic encapsulation thin film at an intersection position where the first step side surface intersects a surface of the hard carrier plate exposed by the hole area, or removing the inorganic encapsulation thin film on the first step side surface close to the intersection position to disconnect the inorganic encapsulation thin film of the edge area from the inorganic encapsulation thin film on the hard carrier plate, wherein the intersection position refers to an intersection position of the first step side surface and the surface of the hard carrier plate exposed by the hole area;
• and
• striping off the hard carrier plate from the base substrate to obtain the display substrate, wherein the inorganic encapsulation thin film in the edge area of the display substrate is an inorganic encapsulation layer, an edge of the inorganic encapsulation layer is located on the first step side surface, and the inorganic encapsulation layer exposes at least a partial area of the first step side surface;
• wherein the first step side surface comprises a first plane and a second plane intersecting each other and being adjacent to the hole area, and a convex edge protruding towards the hole area is formed at the intersection of the first plane and the second plane adjacent to the hole area.