https://www.pcgamer.com/hololens2-future-mixed-reality/

Four years after the rollout of the original HoloLens, Microsoft announced its successor at this years Mobile World Congress, a technology conference focused on mobile hardware and innovation. Creatively dubbed HoloLens 2, the new headset is lighter and, according to Microsoft, three times as comfortable as the first headset, sporting a vastly improved field of view and better resolution.

HoloLens 2 uses a brand new solution for projecting three dimensional holograms onto your eyeballs. While the original unit used tiny projectors to produce images on layered glass that were then diffracted and combined to create three dimensional holograms in the real space around the user, HoloLens 2 beams lasers at mirrors oscillating at up to 54,000 cycles per second and uses the reflected light to paint holograms onto a display. That display is made of what Microsoft calls waveguides, two sheets of custom glass (to the original unit's three) purpose built to reflect holograms into your eyes.