Display device, method of manufacturing the same, and electronic device including the same

A method of manufacturing a display device, the method comprising:

• forming a metal layer on a substrate;
• forming an alignment mark by forming an opening in the metal layer;
• forming a first dam and a second dam on opposite sides of the alignment mark;
• forming a light blocker on both the first dam and the second dam;
• forming, in the light blocker, an opening overlapping the alignment mark;
• forming a first planarization layer on the alignment mark and the light blocker;
• and
• forming a second planarization layer on the first planarization layer, overlapping the alignment mark.

An electronic device, comprising:

• a display panel;
• and
• a lower cover forming an outer appearance and having an opening exposing a portion of the display panel;
• the display panel comprising:
• a substrate including a display area and a non-display area proximate to the display area;
• a first dam disposed in the non-display area;
• a second dam disposed in the non-display area;
• an alignment mark disposed between the first dam and the second dam and provided as an opening in a metal layer;
• a planarization layer disposed on each of the first dam, the second dam, and the alignment mark;
• and
• an optical function layer disposed on the planarization layer,
• wherein an entire upper surface of the planarization layer overlapping the alignment mark is adhered to an entire lower surface of the optical function layer disposed on the planarization layer.