Led monitor hd monitor usb hub 1x upstream 4x downstream usb 30 displayport out series dell ultrasharp screen size 238 inches max resolution 1 920 x 1 080 pixel lcd technology ips response time 8 ms aspect ratio 169 contrast ratio dynamic 2 000 0001 contrast ratio typical 1 0001 brightness 250 cdm widescreen dot pitch 0 275 mm viewing angle 178178 pixel density 9256 ppi display settings srgb support horizontal frequency range 30