As there are some broadcast types here who might know:
In the TV programme "Russell Howard's Good News", Russell performs in front of a wall of what sometimes looks texture-wise somewhat like bricks, or possibly flat-screen TVs arranged in a framework/grid.
The whole wall shows words or pictures related to whatever he's talking about. I used to think the images might be on screens... but they seem to be on the grid/framework as well, which doesn't make sense.
Presumably it's not a green-screen effect, unless the studio audience can't see it.
So is this a back-projection surface? Or what?