Method of fabricating display substrate, display substrate, and display apparatus

A method of fabricating a display substrate having a display area and a peripheral area, comprising:

• forming a plurality of light emitting elements on a base substrate and in the display area;
• forming an encapsulating layer on a side of the plurality of light emitting elements distal to the base substrate to encapsulate the plurality of light emitting elements;
• forming an insulating layer, wherein the insulating layer is formed between the encapsulating layer and the base substrate;
• forming a first barrier wall in the peripheral area and on a side of the insulating layer away from the base substrate, the first barrier wall forming a first enclosure substantially surrounding a first area;
• forming an inorganic blocking layer;
• and
• forming one or a combination of an organic material layer and a cathode layer on a side of the inorganic blocking layer away from the base substrate, the one or combination of the organic material layer and the cathode layer isolated into discontinued portions by lateral sides of the first barrier wall;
• wherein the first barrier wall is formed to comprise a first lower portion in contact with the insulating layer and a first upper portion on a side of the first lower portion away from the insulating layer;
• an orthographic projection of the first upper portion on the base substrate covers an orthographic projection of the first lower portion on the base substrate;
• the first barrier wall is formed so that a side of the first barrier wall away from the base substrate is wider than a side of the first barrier wall closer to the base substrate, along a width direction of the first barrier wall from the peripheral area to the display area;
• the inorganic blocking layer is limited to the peripheral area;
• the inorganic blocking layer at least partially covers, and is in direct contact with, a top surface and a lateral surface of the first upper portion;
• the inorganic blocking layer at least partially covers, and is in direct contact with, a lateral surface of the first lower portion;
• the inorganic blocking layer is formed to be in direct contact with the first barrier wall and the insulating layer;
• and
• at least one inorganic sub-layer of the encapsulating layer covers a portion of the inorganic blocking layer covering the first barrier wall.