Organic electroluminescent device, method for manufacturing the same and display device

An organic electroluminescent device, comprising:

• a base substrate comprising a plurality of pixel regions thereon;
• a pixel electrode layer on the base substrate;
• a planarization layer on the pixel electrode layer, formed with a protrusion on a surface of the planarization layer facing away from the base substrate and at a position corresponding to at least one side edge of a periphery of each pixel region;
• an anode layer on the planarization layer, the anode layer being electrically connected to the pixel electrode layer through a via hole, and the anode layer covering the pixel region and covering a side surface of the protrusion facing the pixel region;
• a light emitting layer on the anode layer and opposite to the pixel region, a height of a surface of the light emitting layer being less than a height of the anode layer covering the side surface of the protrusion;
• a pixel definition layer around each pixel region;
• and
• a cathode layer on the light emitting layer and the pixel definition layer,
• wherein the side surface of the protrusion covered by the anode layer is an arc-shaped concave surface.