I'm no expert on HD development and resolution, but I believe one pixel is significantly below the standards for most displays. ThinQ_ calculated the resolution is 150,000 times worse than an average smartphone display and 2.074 million times worse than a 1920x1080 HD monitor.
The experiment wasn't to produce HD, though; it was to prove the concept of both wireless display and wireless power transmission to something so small.
In the next version of the contact-lens system the team will try to produce a multi-pixel display and, eventually, one with definition high enough that it would be worthwhile testing in humans.
Univ. Washington Dept. of Electrical Engineering