A display device includes a liquid crystal display screen, a transparent conductive layer, and a number of capacitances. The liquid crystal display screen includes an upper substrate and an upper electrode disposed on the upper substrate. The upper electrode includes a number of first conductive bands having the largest electrical conductivity in a first direction. The transparent conductive layer is disposed on the upper substrate, and the transparent conductive layer and the upper electrode are located at opposite sides of the upper substrate. The transparent conductive layer includes a number of second conductive bands having the largest electrical conductivity in a second direction. A number of capacitances are formed at intersections of the first conductive bands and the second conductive bands.