A display device includes a lower panel including a display area and a peripheral area, an upper panel facing the lower panel and including a partition wall defining a plurality of openings in the display area, a first upper dam in the peripheral area and spaced apart from the partition wall and a first opening defined between the partition wall and the first upper dam, and a filling member which is in the display area between the lower panel and the upper panel and extends from the display area and into the first opening defined between the partition wall and the first upper dam.