Display panel, display device, and method for manufacturing display panel

A display panel, comprising:

• a display module;
• a polarizer, on a light exit surface of the display module, wherein at least one outer edge of the polarizer is flush with an outer edge of the display module;
• a cover film, on one surface of the polarizer away from the display module, wherein an outer edge of the cover film except an outer edge of the cover film at a bonding side is flush with an outer edge of the display module except an outer edge of the display module at the bonding side;
• and
• a cooling fin, on one surface of the display module away from the polarizer;
• wherein the cooling fin comprises a first sub-cooling layer, and a second sub-cooling layer on one side of the first sub-cooling layer facing the display module.