A mirror system of a vehicle includes an interior rearview mirror assembly having a reflective element and an information input display providing a display representative of a plurality of input characters. The information input display is disposed behind the reflective element and viewable through the reflective element and a transflective mirror reflector of the reflective element when the information input display is backlit by a backlighting device. A control is operable to determine a location of a touch or proximity of an object at the reflective element and correlate the determined location to an input character of the information input display. The mirror system may include a video display for displaying video images and the information input display may be disposed at a main viewing region of the reflective element so as to provide an information input display that is larger than the video display.