All except the iPad have a grayscale display, called E-ink; the iPad has backlit IPS color.
An E-ink screen looks like a book but the pages will not refresh as quickly as they do with and LCD.
However, if you want to read at night and use the E-ink, you can buy a case with a built-in light.
The Nook features a 16-level gray scale display featuring E Ink technology for crisp, clear and glare-free reading, even in direct sunlight.
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