https://www.clearobject.com/single-post/ces-2020-parallel-reality
So how does the Parallel Reality technology work?
Parallel Reality displays are enabled by a new pixel. As demonstrated at CES 2020, these pixels are capable of simultaneously projecting millions of light rays of different colors and brightness. Each ray can then be directed, via software, to a specific person. Hence having the camera to track you so it knows how to align the pixels.