I started wondering about this when I realized most websites I visit have white backgrounds, and I know that the screen is usually responsible for most of the battery usage. Since I can't change the background in those sites, I might at least switch my wallpaper to a black one.

Most (all?) phones need back-lighting to brighten the screen when needed. Since that back-lighting consumes battery, **is it correct to state that a white screen consumes energy at a faster rate than a black one?** *(assuming the same brightness level in the settings)*

I'm assuming that a white screen needs stronger back-lighting, but I don't know if it's the case.
['https://android.stackexchange.com/questions/5043', 'https://android.stackexchange.com', 'https://android.stackexchange.com/users/1926/']
On OLED, AMOLED and Super AMOLED screens: [Yes](http://techlogg.com/2010/12/ips-vs-amoled-vs-slcd-smartphone-displays-explained/1877)

LCD screens: [No](http://techlogg.com/2010/05/black-vs-white-screen-power-consumption-24-more-monitors-tested/17)
Hey, I just ran a load of test to figure this out. They are vaguely scientific tests! I figured out that I was saving 20% battery by switching to dark wallpaper and dark themed apps. Have a look through my write up, you should be able to work out the saving on your phone:

<http://blog.stevemould.com/phone-battery-save-black-wallpaper/>