A display device includes: a substrate comprising a display area and a peripheral area outside the display area; a first connection line in the display area, the first connection line comprising a first portion extending along a first column of the display area and in the first column, a third portion extending along a second column of the display area and in the second column, and a second portion connecting the first portion to the third portion; and a second connection line in the peripheral area and connected to the third portion of the first connection line and a data line in a third column of the display area.