Hi, I made this. Just so you don't get your hopes up, this hasn't been 'released' as such, it was made to work for me as a learning project. That said, if there's interest I'll tidy it up and post a tutorial.
GitHub only contains a Mac application and an Arduino sketch. Both of those will be fine with your screen. Hardware-wise I've used a ULN2003 array (very simple and inexpensive chip) to power the LEDs from the Arduino. You should be able to do the same as I did, but just with more LEDs.
I've got a 120+" projector screen that I use via Mac & Plex. I'd love to mount some LEDs behind the screen.
Guess we'll have to wait for GitHub to come back online before checking out the specs.