Display module, display module group and screen based on COB packaging

The utility model provides a display module based on COB packaging, a display module group and a screen wherein the display module based on COB packaging comprises a PCB substrate, a plurality of LED chips and a plurality of blocking structures; the plurality of LED chips are arranged on the PCB substrate; the plurality of blocking structures are in one-to-one correspondence with the plurality of LED chips, the plurality of blocking structures are arranged on the PCB substrate, each blocking structure surrounds the peripheral side of the corresponding LED chip, the blocking structures and the PCB substrate form a coating space for coating the LED chips, the coating space is provided with an opening, and the light-emitting surfaces of the LED chips are exposed out of the opening; packaging glue is arranged in each coating space, and a micro-convex structure protruding out of the coating space is formed in the position, corresponding to the opening, of the surface of the packaging glue. According to the inventi