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Hitachi HD44780 LCD is a very common LCD standard for lots of hobbyist projects. (e.g. arduino projects).
You can also find it in use in many printers, and other products, due to its simple interface.
I wonder if it would be a good idea to somehow replace the LCD top with a standard eink LCD display.
problem I could see, is how to deal with ghosting in the eink screen. Also sometimes on power-off, you want to clear the screen, and sometimes you want to leave the content on. Not sure how to deal with that.
But that's why this idea is halfbaked anyway.
Hitachi HD44780 LCD controller
[mofosyne, May 03 2012]
||E-ink display pixels have a much much slower response time than LCD display pixels. So, e-ink displays are fine for static images, but not at all good for video.
||you'd need some intermediate circuitry, at which point you may as well get an e-ink display-controller that's deviceside pin/programming compatible with the aforesaid whatsis.