The post title is in quotes because, although the effect is quite clean & nice, the tech is projection and not really digital wallpaper. What the demo suggests is a programmable surface material, perhaps made of some sort of liquid OLED or biolumin. Wallpaper or paint that could cover a room and represent the full RGB spectrum, dynamically. Nevertheless, the video below suggests the end result of such a future tech, much like the 555Kubik video facade projection.
As an aside, I’ll be posting more videos given the highly visual nature of a lot of the cool emerging tech these days.