When a pixel is black on devices that have AMOLED displays, such as the Samsung Galaxy series, it means they’re turned off. Unlike LCD or IPS displays, there is no backlight with AMOLED. Instead, because each pixel produces light, black pixels that don’t are effectively “off.”

Samsung’s Ultra Power Saving Mode (UPSM) feature takes advantage of this by changing the UI to mostly black, saving a substantial amount of battery life in the process. But if you don’t have UPSM on your device and still want to squeeze more life from your battery by turning off pixels, check out the guide below.
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