I was a member of the light engine team at Micron that designed FLCoS-based picoprojectors until our team was dissolved in an acquisition in 2012. In the short time I was there, I designed and prototyped a full color FLCoS display viewer with custom LED illumination, polarization optics, and an eyepiece, all contained in a mechanical housing.
The optics in many AR glasses also use LCoS displays with similar illumination systems. The difference is that the optics after the display produce an external pupil, rather than project an image at a finite distance.
Picoprojector rendering by Syndiant.