Comment by dghlsakjg

There's a grocery chain (Superstore, Canada) which has been using the small two color displays (black white red) for pricing. They use the tiny 2.7" e-paper screens and a TI cc2540 microcontroller to periodically update the pricing via some 2.4ghz signal (ok fine, I was curious so I stole one to take apart). Seems like a VERY expensive way to keep prices up to date. The BOM cost on one of those little guys has to be north of $10, and I would imagine that the vendor that sold them the system doesn't sell them at cost. Multiply that times thousands of products.... So yeah, people are using them, but it doesn't seem like a great system.