A vehicular dual-state interior rearview mirror assembly includes a mirror head that accommodates an electrochromic mirror reflective element. A video display device is disposed behind a viewable reflective region of the mirror reflective element. With the mirror assembly operating in a first state, the video display device does not display video images at the display screen and the driver of the vehicle views rearward via reflection at the viewable reflective region. With the mirror assembly operating in a second state, the video display device displays video images at the display screen for viewing by the driver. A touch sensor is disposed at an overhang region of the reflective element behind the front substrate and below the video display device. The video display device is operated responsive at least in part to a touch event at the first surface of the front substrate of the electrochromic mirror reflective element.