X100 does Copenhagen
Sometimes those billboards are screening a messy construction site--it looks like that may be the case in the picture of the square (City Hall?)
The "billboard" is just a screening of a construction site. Actually the whole central Copenhagen is a construction site due to district healing renovation and construction of a circle metro line.
The square is Amager Torv (=Square) and located at the famous pedestrian street Strøget.
My flickr: http://www.flickr.com/photos/31474404@N06/