I don’t know how well eInk would work for most tasks, though. I mean, sure, it’s great for reading documents, and you can do so outside on a sunny day. But most PC software isn’t designed to work well with a slow refresh rate.
The battery life savings on an e-reader with an eInk display compared to an LED or LCD screen can be very large, but then the software is designed for it.
If I were only gonna read documents, I think I’d lean towards just loading them onto an eInk e-reader. That just takes, what, a fraction of a minute? Then all the software is designed around the screen’s characteristics.