> their prototypes were built as a head-mounted display and a small projector.

Sounds like there are issues with parallax. Both head-mount and projectors have the benefit of a fixed viewer (or light-source, same thing) relative to the display. LCDs have depth, and at any other angle your offset is ruined. The tech is not likely coming to a desktop or laptop monitor any time soon.

Of course you can probably get around this. The two most obvious solutions being face tracking or paper-thin LCDs.