The invention discloses a display panel, a manufacturing method thereof and a
display device, and belongs to the technical field of display. The display panel comprises a driving backboard, a first
electrode, a filling layer, a pixel definition layer, an organic light-emitting layer and a second
electrode layer. Wherein the pixel definition layer is provided with a plurality of pixel holes, and the side walls of the pixel holes are provided with concave structures. As the flatness of the side, away from the driving back plate, of the filling layer is relatively high, the concave structures are distributed on the side, away from the driving back plate, of the filling layer, it is guaranteed that the distribution positions of the concave structures are basically consistent, and it is guaranteed that the partition effects of the concave structures on the organic light-emitting layer are basically consistent. In this way, at least part of the
orthographic projection of the concave structure on the driving backboard does not coincide with the
orthographic projection of the first
electrode on the driving backboard. Thus, the area, covered by the concave structure, in the first electrode is small, the connection area of the first electrode and the organic light-emitting layer is increased, the
aperture ratio of the display panel is effectively improved, and the display effect of the display panel is good.