> E-ink displays are grayscale Most, but not all. There are commercially available E-Ink color displays (using color filters) such as E-Ink Triton , http://www

> E-ink displays are grayscale Most, but not all. There are commercially available E-Ink color displays (using color filters) such as E-Ink Triton , http://www.eink.com/display_products_triton.html http://www.eink.com/display_products_triton.html . A year ago, E-Ink demonstrated pure color (pigment based) which gives you broad gamut color (more than color filter based displays) but I haven't seen them used in commercial products yet. https://www.youtube.com/watch?v=N2V9iuTW3sA https://www.youtube.com/watch?v=N2V9iuTW3sA The displays can update quickly, even do 10Hz-20Hz type animation. But that would defeat the purpose of using it for low-power by not updating it all.