Pixel light-emitting element, light-emitting substrate and display device

The invention discloses a pixel light-emitting element, a light-emitting substrate and a display device, and belongs to the technical field of materials. The pixel light-emitting element is a pixel light-emitting unit, and the pixel light-emitting unit is provided with an isolation wall and a pixel opening area; an area enclosed by the edge of the isolation wall is the pixel opening area; the pixel opening area is used for accommodating ink droplets; and the edge of the opening area is in a zigzag shape in which convex parts and concave parts are alternately arranged. The angle of the convex part of the opening area is an acute angle; a single tooth on the edge of the open area is formed by a straight plane or an arc plane. Under the same PPI, the area of the pixel opening area is increased, part of printing linearity errors are absorbed, the probability that ink droplets are injected into the pixel opening area is increased, meanwhile, the solution distance between solutions injected into adjacent pixels is