"Mechanical pixels" is an interesting turn of phrase. To my mind, this is no more (or less) mechanical than when molecules are moved around in the IPS LCD display you're probably reading this on.
Nitpickery aside, this is cool stuff. It will be interesting for sure to see what the first real commercialisation of graphene will be. Somehow I think that display technology is sufficiently mature that it won't be the killer app?
I had a similar thought but went slightly further. Imagine a hd capable screen with high frame rate without back-lit illumination and then also like the eink readers not using battery life when screen is static. It could open up a lot of neat things
invest in Bass Metals BSM, they recently acquired mine from Stratmin and producing 6000 tons of graphite per year (for customers in India, US, .. :) you can buy their shares for just 1 cent.. it can easily be 1 USD in few years