Is it true that e-readers is the largest market for e-ink? Supermarkets alone use each thousands of e-ink displays for shelf price labels for example, I wouldn

Is it true that e-readers is the largest market for e-ink? Supermarkets alone use each thousands of e-ink displays for shelf price labels for example, I wouldn't be surprised if that was a more profitable market than e-readers for e-ink, and also much easier to cater to.