A display device is provided. The display device includes a first substrate, a second substrate, a display layer, an active element layer, and a planar layer disposed on the active element layer. The planar layer includes a first contact hole. The display device further includes an electrode pad disposed on the planar layer. The display device further includes a passivation layer disposed on the electrode pad and the planar layer. The passivation layer includes a second contact hole. The first contact hole partially overlaps the second contact hole. The second contact hole has a projection on the planar layer and on the active element layer located at the bottom of the first contact hole, and the greatest width of the projection is at a first axis. The width of the electrode pad perpendicular to the first axis has a specific width change.