A display device including: a display panel which displays an image with light, including: a substrate including: first and second light blocking areas extending in first and second directions, respectively, and a pixel area at which the image is displayed, defined by the first and second light blocking areas which intersect each other; a first shielding line and a data line spaced apart from each other on the substrate at the first light blocking area; a gate line at the second light blocking area to intersect the data line; and a thin film transistor connected to the data and gate lines. The shielding line includes a protrusion protruding toward the data line, the protrusion being overlapped by the thin film transistor. The shielding line is in a same layer of the display panel as the data line among layers disposed on the substrate of the display panel.