always on display

Always-On Display, or AOD is a Super AMOLED feature that is widely available on Android handsets.
This technology was first introduced by Nokia in 2009 on the N86, and more widely adopted with its next generation AMOLED Symbian phones in 2010 (the Nokia N8, C7, C6-01 and E7). It became a standard feature on most Nokia Lumia Windows Phones in 2013, paired with the Nokia Glance Screen app. The feature has since become more widely available on Android handsets including Huawei (Mate 10 Pro, P20 Pro), Motorola (Moto X, Moto Z), LG (G5, G6, G7, V30, V35, V40), Samsung (Galaxy A7(2017, 2018), S7, S8, S9, Note 7/FE/8/9) and the Google Pixel 2, Pixel 3.
A phone with AOD enabled keeps a limited portion of the screen on during sleep mode. An AOD shows the time, date, and battery status by default, but can be configured to also show various types of notifications and screensavers.
The Always On Display feature does consume energy. Though the Samsung Galaxy S7 and S7 Edge are built with AMOLED screens that turn off black pixels, colors, sensors and processors all consume energy while AOD is in use, which leads to an extra consumption of roughly 3 percent.

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