January 25, 2013, 5:45 PM —
Live wallpapers on Android phones and tablets can be quite nice. They’re not a reason to buy a phone, but they can give you typographic clocks, light grids, and other informative or attractive things to look at. But are they worth it?
Live wallpapers could potentially kill your battery in two ways: by causing your display to have to light up bright images, or by demanding constant action from your phone’s processor. On the display side, it may not matter much: your phone requires the same amount of light to display a dark color as a light color. Unless, that is, your phone has an OLED display, sometimes described as an AMOLED or Super AMOLED. As the How-To Geek’s Chris Hoffman explains:
OLED screens don’t have a solid backlight. Each pixel on an OLED screen is an “organic light emitting diode” that produces its own light. When the pixel is black, it isn’t producing any light. When the pixel is white, it’s producing light.
So switching to a black, or very dark, wallpaper can save you battery life on certain phones (mostly Android models). There may be a few live wallpapers that involve moving very dark objects across a very dark background, but let us assume they are exceedingly rare.
The other live wallpaper drain, then, is CPU usage. The nature of the generally free-to-experiment Android market makes it hard to judge all live wallpapers together. Some are studiously, seriously efficient with system resources, and some were absolutely thrown together over a weekend and ride the graphics and processor chips like a vengeful cowboy.
But it’s worth noting that even Google’s own default live wallpapers can slow things down. In his uncommonly positive review of the Nexus 7, MG Siegler noted the lag in navigating the home screen with a live wallpaper running. You can find complaints of live wallpaper battery theft on Hacker News, on Quora, on Tested, and many other places.