Also note that another aspect of the 'LCD vs e-ink' controversy is flicker. Even reflective LCDs have the flicker issue.
LCDs flicker, and *that* is tiring to the eye. E-ink is static -- it stays exactly the same until it is changed. It doesn't have to be refreshed until the image itself has to change, typically at page turn.
The same is true of other dynamic screen technologies like OLED.
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