A flat display for use in mobile terminals includes both a display function and a camera function, and the components for each of the functions are disposed on a common transparent substrate. The display function includes a plurality of display pixels, and each display pixel has an associated switching element. The camera function also includes an array of sensing pixels, each sensing pixel having a photo element for controlling the pixel. The camera function may be disposed in a display or a non-display portion of the substrate. By locating the display function and the camera function on a common substrate, image processing time is decreased and the image quality is improved.