4096x2160 is wider than 16:9 aspect ratio though, around 17:9 I'm fairly sure the panels in these TVs are 16:9, so I don't think your TV has a native 4096x2160 panel, otherwise you should see borders on pixel mapped UHD content. My 4K Samsung TV accepts and even defaulted to 4096x2160 in Windows 10 as well, but with a bit of overscan or scaling.
LG uses the same IPS panel technology [upgraded over the years of course] across their professional line and high-end LCD TV line. Using my RED or Blackmagic camera (something that can drive a 4096x2160 image/video) will sync correctly (i.e., correct picture resolution) with my LG, not my Samsung. As for PC usage/gaming, recommended resolution is the DCI resolution, if I select something lower. On the others like my Sony and Samsung, the recommended resolution is the standard UHD. As stated before, they don't advertise it, because UHD became the established standard for the general consumer market.
Edit: Pictures of DCI vs UHD
Notice the large black bars on the right and the left of the picture labeled 'UHD Camera shot'? That's my LG running in UHD, not the default DCI resolution as seen in 'DCI Camera shot'.
Last edited: