I am asking as currently advertising=screen page claims that it should be always combined with man_made=video_wall which does not seems like a good idea as some advertising screens may be small.
basically in the situation I recall there were video projectors mounted above the central platform in a subway station, projecting at the walls beyond the rails (section is wall | rail | platform for both directions (projectors) | rail | wall). The effect for the people watching (or not) the videos was comparable to (active) video screens, just that the technology was different (no LED in the screens, screens just reflective).