>>293376939
https://uploadvr.com/waveguides-smartglasses/
It's an optical waveguide that uses a diffracted grating to reconstruct an image essentially. But since it's glass you can also see through it and thus have an easy way to do AR. 
So yeah small laser project that get's bounced off a fancy mirror lens into the eyeball. Hololens does the same thing. Several companies have this tech now.