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But they do! If they don't emit lights from pixels, they usually need a backlight to be legible.

E-ink is nice because it does not need a light source to be fully legible in any condition in which print is.



Transflective LCDs do not need a light source either, and, unlike e-ink, can use a backlight in low light conditions.


They're just an exception confirming the rule, though.


E-ink does need a light source, it's impossible to read without sufficient environmental lighting (like real paper).




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