Organic light-emitting display device and method of manufacturing the same

A method of manufacturing an organic light-emitting display device, the method comprising:

• forming a boundary portion and a dam structure spaced apart from the boundary portion on a peripheral area of a base substrate, the peripheral area being between a through area and a display area, and the boundary portion extending from the display area into the peripheral area;
• forming a sacrificial pattern adjacent to the dam structure;
• forming a protruding pattern continuously on the sacrificial pattern and the dam structure;
• removing the sacrificial pattern to form a receiving space and an undercut region under the protruding pattern;
• and
• forming a thin film encapsulation layer continuously extending from the display area to the peripheral area and including at least one organic layer,
• wherein the organic layer of the thin film encapsulation layer includes a filling portion filling at least a portion of the receiving space and protruding toward the dam structure to be aligned with the undercut region.

An organic light-emitting display device, comprising:

• a base substrate including a display area surrounding a through area, and a peripheral area between the through area and the display area;
• a light-emitting element array on the display area of the base substrate;
• an undercut structure on the peripheral area and surrounding the through area;
• and
• a thin film encapsulation layer continuously extending from the display area to the peripheral area, the thin film encapsulation layer including at least one organic layer,
• wherein the organic layer includes a filling portion filling at least a portion of a receiving space between the undercut structure and the display area, and aligned with the undercut structure.