A light-sensitive (i.e., touch-sensitive) display device that requires less circuitry than the currently available light-sensitive display devices is presented. Unlike the currently available devices, which require at least two switching elements and a capacitor to implement a photosensitive switch, the invention only requires one switching element. The device of the invention includes a substrate with a plurality of scan lines, a plurality of read-out lines, a power line, and an array of photosensitive switches formed thereon. The scan lines and the read-out lines extend in directions that are substantially perpendicular to each other, forming pixels. One photosensitive switch is formed in each pixel, and each photosensitive switch has one light-sensitive transistor. The transistor connects the power line to one of the read-out lines in response to sensing incident light.