This is what LG says is the largest transparent LED film installation in Europe, running atop a set of windows at the entry to the Wales Millennium Centre in Cardiff, the main arts center for that country.
I couldn’t find much on the way of detail, but you can see both the impact and the challenges of this tech from the video below.
On one hand, a long ribbon of motion media above the entry doors – using big, bold fonts – is hard to miss from the nearby sidewalk, plaza and roadways. But as you can see from the video, even with an overhead canopy blocking direct sunlight, there is a serious issue with reflection on the glass.