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Ambient brightness: Every time your eye switches from a bright screen (like LCD) to the dimmer ambient room, your eyes adjust which may result in fatigue. With E Ink, the page is the same brightness as everything else in the room so there's no adjustment needed.
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They do have a point here, in a way. But it works both ways. If I'm in a dark(er) environment, e-ink most certainly isn't easier on the eyes unless I bring extra lights. And LCD isn't easier on the eyes in a dark(er) environment unless I turn down the brightness of the screen. On my JE100 I can turn the brightness so low, that it hardly gives out any ambient brightness (I can't light my path with it, for example) and I can read for hours on that. While if I were to use my e-ink and a clip-on light, I'd grow tired of the reflection on my screen.
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No parallax: Parallax is the apparent displacement of an observed object due to a change in the position of the observer. Text on an E Ink screen does not appear to shift at different viewing angles.
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Again, not always true. At least for LCD. If you have a cheap screen, yes. If you have a better quality, no. At least, not noticeable during normal reading experiences.
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Less glare: All E Ink surfaces are treated to be matte like a printed page. Most LCDs are not, which creates glare and decreases legibility.
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Again, not always true. While I do love the matte surface of my readers, I do have the same matte surface on all of my LCD readers. Anti-glare films are a LCD-user's best friend. Not only against glare, but also against scratches...
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Uniform contrast ratio: The contrast ratio of an LCD varies detectably with viewing angle. E Ink's contrast is uniform, so you can read comfortably at any angle.
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See the parallax part. This depends highly on the quality of the screen.
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No aperture ratio loss: LCDs have tiny black gaps between each pixel, but E Ink screens have 100% aperture ratio. The blacks and whites on an E Ink screen are uniform, improving image quality.
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Again, see contrast and parallax. If the pixel density is high enough, you won't see those "black gaps" unless you use a microscope...
Overal, yes, e-ink has the advantage of always being decent on all counts. For LCD you need the better (and more expensive) quality. But to say that e-ink is always better than LCD for reading, I really will never buy that.