A display device is disclosed, which comprises: a substrate; a semiconductor layer disposed on the substrate; a second electrode layer disposed over the semiconductor layer and comprising first data lines extending along a second direction; and plural pixel regions disposed between two adjacent first data lines. Herein, one pixel region has a first section and a second section substantially parallel to the second direction, respectively. The first section overlaps with the semiconductor layer, but the second section does not overlap therewith. When light passes through the display device, a ratio of a first brightness integral value obtained by measuring the first section to a second brightness integral value obtained by measuring the second section is greater than 0.4 and smaller than 1.