Logitech showcased a huge keyboard LED wall at PAX East 2016. This fun project featured 160 of the company's G810 keyboards, resulting in a total of 18,400 RGB LEDs. The wall was reportedly a six-month project conceived by Logitech's Ujesh Desai.
Full details at GamersNexus.
A total of 18,400 RGB LEDs are utilized in the 160-keyboard array, each masked with a diffuser keycap that was laser etched by Right Brain Electronics. Using keyboards as a monitor is, obviously, not an intended use case, and so the teams had to figure out how to resolve negative space presented naturally on the keyboards. All those areas surrounding the arrow keys and F-row keys are easily ignored during the demonstration by way of the diffuser keycaps, which help the brain fill-in the negative space.