You can either slave a screen to a PC, or run apps natively on the ereader device and control it via a BT keyboard. I used an Onyx for a while with Vim and a keyboard to write on. Worked fine, but my eyes are okay so I don't need it.
If I were you, I would get the biggest screen possible. Onyx are solid kit. In my experience they last years. Also they have lots of graphic settings to make them function without flashing. A Dasung may be better out of the box as it's designed to be a monitor. Onyx (some) can be used, but it is not their primary function. The more recent ones are probably the best. I have a lot of faith in Onyx as they have a lot of functionality and are well built, but you will have to frick with it a bit. I think they might make an e-ink laptop, but I guess its Android. You will need to think how you plan to use this screen, as a slave to Windows/Linux/Apple, or as a stand-alone Android device. E-ink for screen is pretty out there stuff. A built in light is highly desirable, but you can get round it by shining a really good light on the screen.
I suggest you watch a lot of videos before laying out cash. Otto knows what he's talking about. He uses one.
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