[foobarian]

Do e-ink screens require periodic refresh to keep the image? I was wondering if it's possible to load an image and remove power.

[macintosh-hd]

Nope. I’ve had a tiny one connected to a raspberry pi that is still displaying an image over a year after I unplugged it.

[kayodelycaon]

No. I have a hacked kindle that's been sitting in a drawer for years. The custom image it's displaying looks the same as when I set it.