It's a 50K display that wraps two levels of a football stadium (the MCG in Melbourne, Australia). Everything can be rendered in real-time. Control is handled handled by an on-site operator, or can be handed over to an autonomous system that links into game stats feeds, umpire systems and a host of other triggers.
Content is generated at 60Hz and pushed to the physical displays at ~3600Hz to provide smooth visual during broadcast and during slow motion playback. Being ~1KM long and outside individual sections of the display can also have smoothed, real-time image adjustments adding to account for variation in environmental conditions (shadowing etc) and provide continuous visual quality across the full image.