An interior rearview mirror assembly for a vehicle includes a mirror casing having a human machine interface thereat. The mirror assembly includes a display device disposed behind the transflective mirror reflector of the interior rearview mirror assembly and visible through the transflective mirror reflector to the driver when displaying information. The display device may include a video screen. The user actuatable input may be actuatable by a user to operate at least one element of circuitry disposed in the mirror casing. The human machine interface may be at least partially at a bezel portion of the casing, or may be at least partially at a rear casing portion of the mirror casing.