A:Answer If you’re viewing a standard definition (240p or 480p, 4:3 aspect ratio) then it will require “zoom” in order to fill the 720p, 16:9 aspect ratio LCD panel. If you use a high definition source, then the panel will display the image using the entire screen.
A high definition source would be a DVD or BluRay connected via HDMI, or a high definition ATSC broadcast, for example.