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.