I just have to point out, it was really easy to find these. Like took me 30 seconds.
https://patents.google.com/patent/US20080043317A1/en
https://patents.justia.com/assignee/e-ink-corporation
https://patents.google.com/patent/US20080043317A1/en
https://patents.justia.com/assignee/e-ink-corporation