A display device includes: a lower substrate including a display area including a plurality of pixels and peripheral areas around the display area; an encapsulation substrate facing the lower substrate, and including a plurality of edges facing different directions; a sealant between the lower substrate and the encapsulation substrate, the sealant being at the peripheral areas; a voltage transmission line at the peripheral area and being configured to transmit a common voltage; and a voltage transmission electrode at the peripheral area and connected to the voltage transmission line to form at least one contact part, in which the sealant includes a first expanded part and a first non-expanded part having a smaller width than a width of the first expanded part, and the contact part and the first expanded part are alternately arranged.