A pixel array includes first signal lines, second signal lines, active elements, pixel electrodes, and selection lines. The second signal lines are intersected with and electrically insulated to the first signal lines to define pixel regions. The active element and the pixel electrode are disposed in the pixel regions. The active elements are electrically connected to the first signal lines and the second signal lines. The pixel electrodes are electrically connected to the active elements. The selection lines are disposed over the first signal lines and intersected with the first signal lines to form first intersections and second intersections. The selection lines are electrically connected to the first signal lines at the first intersections and electrically insulated to the first signal lines at the second intersections. The selection lines and the pixel electrodes are leveled. The selection lines are electrically insulated to the second signal lines.