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An e-book reader, also known as an e-reader, is a portable electronic device that is designed primarily for the purpose of reading e-books and periodicals. E-book readers are similar in form to a tablet computer, and usually refer to readers that use electronic paper, resulting in better screen readability, especially in bright sunlight, and longer battery life. When disconnected from the web, an e-book reader's battery will last from weeks to months. A tablet computer has a faster screen capable of higher refresh rates which makes them more suitable for interaction. Any device that can display text on a screen can act as an e-book reader, but without the advantages of the e-paper technology. On the other hand most e-books are read on devices not specifically designed for reading e-books, such as laptop computers, smartphones, and tablets.〔(And the most popular way to read an e-book is ). Wired. November 2010.〕 ==Types of Electronic-paper displays== All electronic paper types offer lower power consumption and better sunlight contrast than LCDs. Some offer backlights in low-light reading situations. With the backlight turned off, all have a similar appearance to "ink on paper" and are readable in bright environments. *E Ink: Although "eInk" is used casually to talk about all electronic paper displays, "eInk" was trademarked by the company Vizplex, which sells the majority of electronic paper displays. *E Ink Pearl: Vizplex's 2nd generation technology, which has higher contrast and a greater number of different levels of gray than their earlier technology. *E Ink Carta: Vizplex's 3rd generation technology, which has higher contrast and a greater number of different levels of gray than their earlier technology. *E Ink Mobius: Vizplex's 4th generation technology. *SiPix: An early competitor to Vizplex, which had almost instantaneous page turns. *LG Flex: Electronic paper that allows for a flexible screen. With these displays, users can bend the e-reader without damaging it and do things like fold it up to put in their pocket. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Comparison of e-book readers」の詳細全文を読む スポンサード リンク
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