L4D2 HD wallpaper for Wide 16:10 5:3 Widescreen WHXGA WQXGA WUXGA WXGA WGA ; HD 16:9 High Definition WQHD QWXGA 1080p 900p 720p QHD nHD ; Standard 3:2 Fullscreen DVGA HVGA HQVGA devices ( Apple PowerBook G4 iPhone 4 3G 3GS iPod Touch ) ; Mobile 5:3 3:2 16:9 - WGA DVGA HVGA HQVGA devices ( Apple PowerBook G4 iPhone 4 3G 3GS iPod Touch ) WQHD QWXGA 1080p 900p 720p QHD nHD ;