Manufacturing method of display panel, display panel and display device

A manufacturing method of a display panel, comprising:

• providing a base substrate;
• forming a planarization layer on a side of the base substrate;
• forming a first film layer on a side of the planarization layer facing away from the base substrate;
• forming an anode via penetrating through the first film layer and the planarization layer;
• forming an anode layer on a side of the first film layer facing away from the base substrate;
• patterning the anode layer to form a first opening on the anode layer;
• and
• after patterning the anode layer, patterning the first film layer to form a second opening on the first film layer;
• wherein a material of the first film layer comprises a non-metallic material;
• the first opening penetrates through the anode layer, and the second opening at least partially penetrates through the first film layer;
• and an orthographic projection of the second opening on the base substrate at least partially overlaps an orthographic projection of the first opening on the base substrate.