A combination of any of these 1500 https://patents.google.com/?assignee=E-Ink+Corporation&sort=new This is the first one that comes up mentioning "color":

A combination of any of these 1500 https://patents.google.com/?assignee=E-Ink+Corporation&sort=new This is the first one that comes up mentioning "color": https://patents.google.com/patent/US20160116816A1