Display panel providing planarization layer on pixel defining layer around light emitting functional layer, display device, and manufacturing method of the display panel

A manufacturing method of a display panel, comprising the following steps:

• forming a source drain layer;
• forming a first planarization layer on the source drain layer;
• forming a second planarization layer on the first planarization layer and patterning the second planarization layer, wherein the patterned second planarization layer has a light shielding structure and a first groove is formed by the light shielding structure;
• forming an anode layer on the second planarization layer, wherein the anode layer completely covers the first groove and is extended to cover a portion of the second planarization layer;
• forming a light emitting functional layer on the anode layer in the first groove;
• and
• forming a cathode layer on the light emitting functional layer in the first groove.