They are using this tech: https://www.youtube.com/watch?v=1UF9fJtZHAY
It's like a reversed type of piezo-endoscope that projects the image on the eye itself.
The patent can be seen here: https://encrypted.google.com/patents/WO2014113506A1?cl=en
The full term for this tech is: scanning fiber display with piezoelectric actuator
Btw if nobody wants to read it, the way the scanning fibre endoscope works is that the fibre acts as a very fast one pixel camera (send down R, G and B light and record the reflection magnitude). To build an image the tip is vibrated in a circular pattern of varying diameter using a piezo crystal.
The display version would modulate the strength of the R, G and B lights to transmit an image.
The idea of vibrating fibre is just so amazing that i really do think that they will pull this off, i'm just curious as to how large the controllbox will be and if they can manage to shrink it to glasses sizes.