> saves energy As far I understand this is not true. Can anyone smarter than me ...

jckt · on July 11, 2014

http://www.scientificamerican.com/article/fact-or-fiction-bl...

I think it only saves energy on CRT screens, which is not popular these days.

guelo · on July 11, 2014

Some of the phone screen technologies such as AMOLED also save power with black.

dflock · on July 11, 2014

It depends on the type of screen you're using and whether it's actually black - rbg(0,0,0) or just dark. In some cases, yes, it saves energy, some not.