The core patents already have expired. They have competition, it's called Reinkstone (and their DES/cofferdam tech).
The reason e-inks are so expensive and progressing so slowly is that it's a niche product which doesn't drive much R&D spending (compared to LCDs, which sell billions per quarter and you're reading this comment on).
The reason e-inks are so expensive and progressing so slowly is that it's a niche product which doesn't drive much R&D spending (compared to LCDs, which sell billions per quarter and you're reading this comment on).