[Heyokamerican]

I believe the front element is curved--i.e. it's a lens--and the system puts focus a couple of feet forward of the windshield.

[coredog64]

A proper HUD uses collimation to move the perceived focus point out to infinity.

[agumonkey]

So there's a very tiny display in the base ?

ps: oh .. I just clicked, it's probably the same thing as the Google Glass HUD.