Comparison of e-readers
An e-reader, also known as an e-book reader, is a portable electronic device that is designed primarily for the purpose of reading e-books and periodicals. E-readers have a similar form factor to a tablet and usually refers to devices that use electronic paper resulting in better screen readability, especially in bright sunlight, and longer battery life when compared to a tablet. An e-reader's battery will typically last for multiple weeks. In contrast to an e-reader, a tablet has a screen capable of higher refresh rates which make them more  suitable for interaction such as playing a video game or watching a video clip. Types of electronic-paper displays. All electronic paper types offer lower power consumption and better sunlight contrast than LCDs. Some offer a backlight to allow for low-light reading. With the backlight turned off, all have a similar appearance to "ink on paper" and are readable in bright environments. Electronic paper readers come in various sizes. Many small e-readers have display diagonal sizes around , while some of the large commercially available readers have display sizes around A5 () or A4 size (. Commercially available devices sold by  maker or designer. Notes: Electronic-paper displays. Private label hardware. Some common hardware is resold in different national markets under various brand names. Below is the list of identical hardware: File format support. "See Comparison of e-book formats for details on the file formats." The most notable formats are: This list is missing many of the 1st and 2nd generation e-reader devices from the 1990s to 2005. This list could be expanded by adding Unicode support information for e-readers.