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Seriously, Nestle? There’s no way this makes any real difference
(sh.itjust.works)
a community dedicated to hating nestle!
LCDs do not stay off for black. LCDs fill the entire back with bright white light and then shutter off pixels to make them black. The energy used between displaying white (the backlight) and displaying black is basically the same.
OLED is a bit more complex.