I don't think a large building digital screen needs to be the same stuff you'd see in say signage or a jumbo-tron, concert back drop etc.
I've noticed for the past four years, the Detroit International Auto show has used lighter density arrays of LED's for huge wall signage. Viewed from far away, they still look very high res. The biggest benefits being that you can put them behind glass and your tenants can still have a view outside.
I'll see if I can find that info for you.[/QUOTE]
Thanks for the FYI.
http://www.youtube.com/watch?v=v9MqgK8_ZGc