If you look at MS's patent application for the screen, they basically can't. It's essentially an elaborate optic fiber using internal reflection and medium changes to bounce light sideways along the surface of the glasses to emerge at the right point.gravy wrote: That's promising, you'd hope the FOV could be widended before launch.
With regular glass (ie. a refractive index of about 1.5) the widest spread you can go is about 35 degrees. You need to find something transparent to visible light with a higher refractive index. I suspect that means the only alternatives are crazy expensive synthetic materials.
I can certainly still see uses for a limited fov device, but it's a far throw from the fully immersive rendered videos they're using to show it off.






