Very cool technology:
Delta Air Lines recently introduced a “Parallel Reality” system that lets travelers access individual flight information on a shared overhead screen based on a scan of their boarding pass — or their face. The twist is that 100 people can do this at a time, all using the same digital screen but only seeing their own personal details.
Unlike a regular TV or video wall, in which each pixel would emit the same color of light in every direction, the board sends different colors of light in different directions.
Coming to a giant airport screen: Your personal flight information
But it does require computers know exactly who and where you are.