The University of Cambridge released (this was towards the end of August 2013, but I just found it now) a video showing sample transparent graphene electrodes based device prototypes:
In the video you can see a graphene touch panel used in a simple digital piano application, and also a flexible transparent display. The keyboard device is simple - when you touch the graphene electrode, the electrical charge changes which is detected by a simple electronic circuit-board connected to a speaker.
Posted: Nov 11,2013 by Ron Mertens