From Vizio:
“Most HDTVs have an aspect ratio of 16:9 (sometimes called 1.78:1), with a native resolution of 1,920 x 1,080 (Full HD). This aspect ratio was selected as the ATSC HDTV standard as a compromise between television’s original aspect ratio (4:3 or 1.33:1) and the wider 1.85:1 aspect ratio selected for the many Hollywood movies. Big-budget Hollywood blockbusters, though, are usually filmed in the much wider 2.35:1 or 2.39:1 aspect ratios. VIZIO’s new Cinemawide HDTVs accommodate these “CinemaScope” or “anamorphic” aspect ratios well with a 2.37:1 (21:9) aspect ratio. So you’ll be able to watch classics and today’s best movies in the film’s original aspect ratio and without black bars.”