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Basically the e-ink screen is like a paper , when the image is loaded in the screen , the screen is turned off , only the front-light is on , not like in LCD screens where the screen is only turned off when it's black ( Super Amoled screens) , and that is the reason why E-ink doesn't hurt the eyes compared to LCD , LCD uses a back-light lighting system while E-ink uses front-light .
There are some E-ink devices that don't use light just like a real book .
Personally i can't read for a long time on LCD screens since it tires my eyes. On the other hand i can spend at least 2 hours reading on a E-ink screen without getting eye sore.
Most E-ink devices today uses a resolution of 300dpi just like most printed books.
If you are still unsure i'd advice you to borrow an E-reader from someone you know or buy it from eBay .
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