Comment by the__alchemist

What MCU are you using? Have you run into issues with shortages? I'm asking since I'm also developing an e-paper product, for a different purpose. Are you doing full refreshes each update? Seems like it would be OK in this use, since the content doesn't change often.

You mentioned batteries as a complexity-adder: I agree, but ideally, this makes sense as a battery-powered device. It should be capable of running for a very long time on a few AA or AAAs. (The limitation being internet connectivity for refreshing) The advantage is reduced cable clutter, and flexibility in where it goes. Maybe for a second edition, as not to delay release.