Display substrate with water-blocking structure, fabrication method thereof, display panel and display apparatus

A display substrate, comprising

• a base substrate,
• a display structure in a display area of the base substrate,
• at least one blocking structure in a non-display area surrounding the display area of the base substrate, the at least one blocking structure comprising a first blocking structure;
• wherein the base substrate includes a dielectric layer, and a surface of the dielectric layer on a side of the display structure is provided with a groove recessed inside of the dielectric layer;
• the first blocking structure includes a protrusion disposed in the groove;
• and
• a height of the protrusion is larger than a depth of the groove, or a surface of the protrusion is higher than a surface of the dielectric layer.