I designed my own custom E-ink displays [video]

Eh, there's a lot more to replacing e-ink than than just length of time an image can stay on the screen. There's also the energy required to flip the pixels and also the pigment grain which dictates the resolution, plus the pitfalls that come with going high-res with pigment display such as ghosting, blurryness, etc.

Seeing as these are all thick segment displays, I doubt that company will be making Kindle-level displays any time soon, but for stuff like thermometers, clocks, bus/rail time tables, notice boards, etc. it looks sick.