That ended up being sort-of debunked. LCDs use about the same amount of energy to display blacks as they do whites. Although there are energy savings with CRT

That ended up being sort-of debunked. LCDs use about the same amount of energy to display blacks as they do whites. Although there are energy savings with CRTs and OLED (don't most android phones use OLED? so that might be the new point of savings)