If slow is what you are looking for, there has finally been some movement on building controllers for bog-standard e-ink panels like you find in kindles. Refres

If slow is what you are looking for, there has finally been some movement on building controllers for bog-standard e-ink panels like you find in kindles. Refresh rate is far below the 75hz in this project, but the price is too. my 10 second search didn't find the project notes I had in mind but I'm pretty sure this is the same end result: https://www.waveshare.com/7.8inch-hdmi-e-paper.htm https://www.waveshare.com/7.8inch-hdmi-e-paper.htm