A video mirror system suitable for use in a vehicle includes an interior rearview mirror assembly having a reflective element and a video display screen module. The video display screen module may have a metallic enclosure and at least one of (a) a polarizer film and (b) a brightness enhancing film, and includes a liquid crystal display panel that is back lit by a plurality of white light emitting light emitting diodes. The video display screen module is fixedly disposed to the rear of the reflective element or near the reflective element or is extendable from a position at the rear of the reflective element to a position near the reflective element. The video display screen module, when activated, displays video images viewable by the driver and having a driver-viewable display luminance of at least about 700 candelas per square meter when viewable by the driver during daytime viewing.