Isn't it clear glass and not a layer over a traditional display like the 3DS? Glasses would either actively time slice with shutters, or spectrum slice with passive filters on the lens and of course you need the glasses.
How could any of those technologies be what is used here?
E: Looking again, perhaps it could be some layer over a traditional screen. You see through some of the broadcasts but that could just be the digital far plane that shows through.
I'm not sure I'm following. If this is based on a flat panel display, there must be a lens array in front of it. There is no other way to achieve this effect without requiring the users to wear glasses. The lens array can be covered by a protective flat glass pane without issue.
How could any of those technologies be what is used here?
E: Looking again, perhaps it could be some layer over a traditional screen. You see through some of the broadcasts but that could just be the digital far plane that shows through.