Advantages
Apart from the advantages mentioned before, the VRD system scanning light into only one eye allows images to be laid over one's view of real objects. For example, it could project an animated, X-ray-like image of a car's engine or the human body.
VRD system also can show an image in each eye with a enough angle difference to simulate three-dimensional scenes with high fidelity. If applied to video games, for instance, gamers could have an enhanced sense of reality that liquid-crystal-display glasses could never provide, because the VRD can refocus dynamically to simulate near and distant objects with a far superior level of realism.
This system only generates essentially needed photons, and as such it is more efficient for mobile devices that are only designed to serve a single user. A VRD could potentially use tens or hundreds of times less power for Mobile Telephone and Netbook based applications.
Another important advantage is privacy: Only the intended user (in the usual case of single-user devices) is able to see the image displayed. This kind of device is also less vulnerable to TEMPEST type side-channel leak of information.
Read more about this topic: Virtual Retinal Display
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