Looks like my post got a second chance. I'm not affiliated with the project, but I am an interested e-ink monitor enthusiast.

You may be interested to know that this project is a fully open project, all source code, verilog, algorithm documentation and hardware design files are on github:

https://github.com/Modos-Labs/Glider https://gitlab.com/zephray/caster

Three years ago, I posted about modding a ThinkPad T480 into an e-ink laptop: https://news.ycombinator.com/item?id=26245563

That turned into a community project and eventually into building our own FPGA-based e-ink display controller to improve refresh speed and reduce ghosting.

The result is a dev kit and monitor: open hardware, supports 6–13" monochrome and color e-ink panels over HDMI or USB-C, up to 75 Hz with sub-100 ms latency, and includes a C API.

Hardware, firmware, docs and schematics: https://github.com/Modos-Labs/Glider

I talked to my wife constantly about how badly I want an e-ink monitor, they’re just still so expensive for the specs I want haha. I’d take a solid 24”, maybe 21”, b&w 30hz at this point if the price was right (sub-$500).