Display device

A display device, comprising:

• a substrate comprising a first substrate, an interlayer insulating layer, and a second substrate, the first substrate having a thickness different than the second substrate;
• a display area;
• an open area surrounded by the display area;
• a transistor disposed over the substrate;
• a first planarization layer disposed on a first source-drain electrode pattern of the transistor;
• a second source-drain electrode pattern disposed on the first planarization layer;
• a second planarization layer disposed on the second source-drain electrode pattern;
• a light emitting element disposed on the second planarization layer and comprising an anode, a light emitting layer, and a cathode;
• an encapsulation layer disposed on the light emitting element, and comprising at least one inorganic layer and at least one organic layer;
• a touch sensor disposed over the encapsulation layer;
• a protection layer disposed on the touch sensor, and comprising an organic material;
• and
• a third planarization layer disposed on the protection layer,
• wherein the third planarization layer has a thickness different than the protection layer.