Display panel, manufacturing method, and display device

A method for manufacturing a display panel, comprising:

• forming an anode of each pixel unit on a substrate;
• forming a pixel definition layer on the substrate;
• wherein the pixel definition layer comprises:
• a plurality of first barrier walls and a plurality of second barrier walls;
• the plurality of first barrier walls extend along a first direction and are arranged along a second direction, the plurality of second barrier walls extend along the second direction and are arranged along the first direction;
• the first direction and the second direction intersect;
• the plurality of first barrier walls and the plurality of second barrier walls define a plurality of openings, and one opening corresponds to one anode;
• and
• forming a light emitting layer and a cathode of each pixel unit on one side of the anode and the pixel definition layer facing away from the substrate;
• wherein the plurality of first barrier walls comprise:
• two edge barrier walls, a plurality of intermediate barrier walls and two separation barrier walls;
• the two edge barrier walls are two first barrier walls at two edges along the second direction;
• the plurality of intermediate barrier walls are between the two edge barrier walls;
• the two separation barrier walls are between the two edge barrier walls and respectively on both sides of the plurality of intermediate barrier walls along the second direction;
• and heights of the second barrier wall, the edge barrier wall and the separation barrier wall each is greater than a height of the intermediate barrier wall.