an object is to provide a pixel structure of a display device including a photosensor which prevents changes in an output of the photosensor and a decrease in imaging quality . the display device has a pixel layout structure in which a shielding wire is disposed between an fd and an imaging signal line or between the fd and an image - display signal line in order to reduce or eliminate parasitic capacitance between the fd and a signal line for the purpose of suppressing changes in the potential of the fd . an imaging power supply line , image - display power supply line , a gnd line , a common line , or the like whose potential is fixed , such as a common potential line , is used as a shielding wire .