How does the digital ink in ereaders work?

Summary
Unlike regular LCD and OLED displays, ereaders rely on e-ink tech that lets them gently sip power and last for months. Here's the science behind how it works.
Description from Engadget.
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How does the digital ink in ereaders work?
Unlike regular LCD and OLED displays, ereaders rely on e-ink tech that lets them gently sip power and last for months. Here's the science behind how it works.
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