There's the attractively named DES Slurry technology which I think has even been in shipping devices: https://goodereader.com/blog/e-paper/des-display-electron

There's the attractively named DES Slurry technology which I think has even been in shipping devices: https://goodereader.com/blog/e-paper/des-display-electronic-slurry-is-next-generation-e-paper https://goodereader.com/blog/e-paper/des-display-electronic-...