There are a few color e-paper solutions on the horizon. Clearink has been developing their color tech for four years. In early 2018 they unveiled the first 1.32 inch color e-paper display with a 202 DPI screen, which is a dramatic increase from the 106 DPI prototype they announced last year. They also announced this model has a 30.4% more improved Color Gamut and it needs less power because they managed to incorporate a 5V battery, which is a 50% decrease from last year.
— Read on goodereader.com/blog/electronic-readers/where-in-the-world-is-color-e-paper