Can I Leave My Kindle on Always?
No power is consumed when the Kindle device slips into sleep mode, thus, a manual power-down is unnecessary. The Kindle only uses power when changing page displays or when using the Wi-Fi feature. After a few minutes of non-use, the device automatically powers down, and the E Ink technology eliminates any possibility of image burn damage when in sleep mode.
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Sleep Mode
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Amazon customer service states "It uses more battery power turning your device on and off. Once in sleep mode, no energy is being used." In other words, E Ink devices only use energy when refreshing a screen or when connected to the Wi-Fi feature.
Power Down
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Amazon customer service states, "You do not need to power down the Kindle between reading sessions; it is best to leave the device in sleep mode." Sliding and releasing the Kindle "on/off" switch wakes or puts the device to sleep.
When the Kindle screen freezes, rebooting the device is necessary. To reboot or turn off the Kindle, slide the power switch to the right, hold for five seconds and then release the switch. Wait several seconds then re-wake the device by sliding the power switch to the right and releasing.
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Battery Life
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The Kindle battery will last more than a month if not connected to Wi-Fi, according to Amazon. Therefore, Amazon recommends turning the feature off when unused. Playing games such as Scrabble also depletes battery life. When waking the Kindle from sleep mode, the light displays green when fully charged and displays a golden or amber color when less than 100 percent.
Disadvantages
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Electronic Paper devices have a low refresh rate compared to LCD devices preventing implementation of complex, interactive applications. In addition, a shadow or "ghost image" may be visible after refreshing a screen. Unlike LCD screens, the "ghost image" disappears after several page refreshes. Many devices flash the screen white and black when loading a new page to remove the ghost image display.
Electronic Paper Technology
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Electrophoretic Ink, manufactured by E Ink Corporation, revolutionized the ePaper industry. E Ink manufactures a type of processed film, which integrates into a variety of devices, including e-readers, mobile phones and watches.
In July 2010, E Ink Corporation released E Ink Pearl, a second-generation high-contrast, gray-scale display. In November 2010, E Ink Corporation announced a third generation of e-Ink displays -- a color screen that can be read in high light. E Ink Triton displays 16 shades of gray and 4096 colors.
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