A display device includes a display panel, a timing controller, a gate driver, and a data driver. The display panel includes a display area for displaying an image and a non-display area adjacent to one side of the display area. The display area includes gate lines, data lines, gate dummy lines, a data contact portion, and pixels. The data lines cross and are isolated from at least a part of the gate lines. The gate dummy lines are parallel with and are spaced from the gate lines. The data contact portion couples the gate dummy lines and the data lines at one side of a second direction perpendicular to the first direction.