While watching some of the World Cup events, one of our viewers brought a tweet, and subsequent question, to our attention
Up until this year, the NCAA had rules about bagels with cream cheese, so you can be sure they have restrictions on technology like this on the sidelines. And if it wasn't a rule, you could bet your mortgage that Chip Kelly or Gus Malzahn (or some other innovative offensive mind) would have already been all over utilizing something like this.
The more I think about it, the more I like it, and I can't see why it would really be all that much of a stretch to make happen. Get a flat screen, or maybe an over-sized tablet, and send (or flash) the pictures you need on the screen by someone up in the box sending it via a wireless or bluetooth signal from a laptop.
I'm not a technology expert, but it seems to be like it's more than feasible to see at some point in the near future, provided The NCAA eventually allows it. After all, allowing technology in this case solely for the purpose of signaling in plays provides no schematic advantage (or other imaginable advantage, it's just a different way to provide the play call to your guys.
Personally, I'm all for it, but I'm open to hearing other vantage points.