A display device , comprising: a substrate including an island portion and at least one connection portion extending from the island portion ; a display unit on the island portion , the display unit including at least one display element; and an encapsulation layer covering the at least one display element and including an inorganic encapsulation layer , wherein the display unit includes: at least one organic insulating layer ; and an inorganic insulating layer on the at least one organic insulating layer , the inorganic insulating layer having a tip (PT) protruding beyond a side surface of the at least one organic insulating layer , in a direction parallel to an upper surface of the substrate , and the inorganic encapsulation layer is alongside and contacts the tip (PT) of the inorganic insulating layer , wherein the substrate includes repeatedly arranged basic units (U) that each include the island portion and the at least one connection portion , a closed line (CL) is formed between adjacent basic units (U) from among the basic units (U), wherein the closed line (CL) defines a distance area (V) in which portions of the island portion and portions of the at least one connection portion are absent, and wherein an area where the inorganic encapsulation layer and the tip (PT) of the inorganic insulating layer are alongside each other is an inorganic contact area (ICA) that is around the at least one display element in a plan view. a substrate including an island portion and at least one connection portion extending from the island portion ; a display unit on the island portion , the display unit including at least one display element; and an encapsulation layer covering the at least one display element and including an inorganic encapsulation layer , wherein the display unit includes: at least one organic insulating layer ; and an inorganic insulating layer on the at least one organic insulating layer , the inorganic insulating layer having a tip (PT) protruding beyond a side surface of the at least one organic insulating layer , in a direction parallel to an upper surface of the substrate , and the inorganic encapsulation layer is alongside and contacts the tip (PT) of the inorganic insulating layer , wherein the substrate includes repeatedly arranged basic units (U) that each include the island portion and the at least one connection portion , a closed line (CL) is formed between adjacent basic units (U) from among the basic units (U), wherein the closed line (CL) defines a distance area (V) in which portions of the island portion and portions of the at least one connection portion are absent, and wherein an area where the inorganic encapsulation layer and the tip (PT) of the inorganic insulating layer are alongside each other is an inorganic contact area (ICA) that is around the at least one display element in a plan view. at least one organic insulating layer ; and an inorganic insulating layer on the at least one organic insulating layer , the inorganic insulating layer having a tip (PT) protruding beyond a side surface of the at least one organic insulating layer , in a direction parallel to an upper surface of the substrate , and the inorganic encapsulation layer is alongside and contacts the tip (PT) of the inorganic insulating layer , wherein the substrate includes repeatedly arranged basic units (U) that each include the island portion and the at least one connection portion , a closed line (CL) is formed between adjacent basic units (U) from among the basic units (U), wherein the closed line (CL) defines a distance area (V) in which portions of the island portion and portions of the at least one connection portion are absent, and wherein an area where the inorganic encapsulation layer and the tip (PT) of the inorganic insulating layer are alongside each other is an inorganic contact area (ICA) that is around the at least one display element in a plan view. <EOS>