A mirror reflective element sub-assembly for an exterior rearview mirror assembly of a vehicle includes a mirror reflective element and a video display element. The video display element is disposed behind the mirror reflective element so that images displayed by the video display element are viewable through the mirror reflective element when the video display element is activated. The video display element is configured to display images that are readily viewable by the driver of the host vehicle and not readily viewable by drivers of other vehicles in the lane adjacent to the host vehicle.