An interior rearview mirror assembly includes a display screen that is extendable and retractable relative to a casing. The display screen is movably mounted at the casing and movable or slidable in a direction generally parallel to a length axis of the reflective element between a non-use position, where the video display screen is positioned substantially within the casing, and a use position, where the video display screen is substantially extended from a side of the casing for viewing. The display screen may be automatically extended in response to an activating event.