Display panel, manufacturing method thereof and display device

A method for manufacturing a display panel, comprising:

• providing a substrate having a display area and a non-display area;
• forming a planarization layer on the display area and the non-display area of the substrate;
• forming an organic light emitting element on a side of the planarization layer away from the substrate, wherein the organic light emitting element is located in the display area;
• forming an encapsulation structure wrapping the organic light emitting element, wherein the encapsulation structure comprises a first inorganic layer, an organic layer and a second inorganic layer which are sequentially stacked, the first inorganic layer and the second inorganic layer extend into the non-display area, and the first inorganic layer is arranged close to the planarization layer;
• wherein the method further comprises:
• forming a third inorganic layer, causing that the third inorganic layer is located in the non-display area and is located between the planarization layer and the first inorganic layer;
• and/or
• providing a groove in a part of the planarization layer located in the non-display area, and filling the groove with a flexible water-oxidation resistant material;
• wherein subsequent to the providing the first inorganic layer and prior to the providing the organic layer, the method further comprises:
• forming a fourth inorganic layer in the display area, wherein a roughness of the fourth inorganic layer is greater than a roughness of the first inorganic layer.

A display device, comprising a display panel;

• wherein the display panel comprises:
• a substrate having a display area and a non-display area;
• a planarization layer covering the display area and the non-display area of the substrate;
• an organic light emitting element located in the display area and located at a side of the planarization layer away from the substrate;
• an encapsulation structure wrapping the organic light emitting element, wherein the encapsulation structure comprises a first inorganic layer, an organic layer and a second inorganic layer which are sequentially stacked, the first inorganic layer and the second inorganic layer extend into the non-display area, and the first inorganic layer is arranged close to the planarization layer;
• wherein the display panel comprises a third inorganic layer, and the third inorganic layer is located in the non-display area and is located between the planarization layer and the first inorganic layer;
• and/or
• a part of the planarization layer located in the non-display area is provided with a groove, and the groove is filled with a flexible water-oxidation resistant material;
• wherein the display panel further comprises a fourth inorganic layer located in the display area and between the first inorganic layer and the organic layer, and a roughness of the fourth inorganic layer is greater than a roughness of the first inorganic layer.