The answer in short: No, black color doesn't save energy in LCD monitors. It consumes a bit more! Black color save energy in CRT monitors (see history) and on OLED monitors (see at far future). Both of them almost doesn't exist in today days.
LCD panels make black pixels by blocking the colour filtered back-light from exiting the panel. It therefore uses a little more power to make black than to make white
See http://electronics.howstuffworks.com/lcd2.htm
LCD TV's sometimes have "dynamic contrast" LED back-lighting which should save power in black. This feature is sometimes found on high end IPS LCD monitors, though is useless for general computer use as the LED back-light resolution does not match the actual LCD resolution
OLED panels use power to make each individual coloured pixel, so black would save power. Who uses a couple of 24" OLED's yet?
See http://electronics.howstuffworks.com/oled2.htm
And more interestingly http://www.popsci.com/scitech/article/2009-09/mit-scientist-explains-oled-function-glowing-pickle
LCD panels make black pixels by blocking the colour filtered back-light from exiting the panel. It therefore uses a little more power to make black than to make white
See http://electronics.howstuffworks.com/lcd2.htm
LCD TV's sometimes have "dynamic contrast" LED back-lighting which should save power in black. This feature is sometimes found on high end IPS LCD monitors, though is useless for general computer use as the LED back-light resolution does not match the actual LCD resolution
OLED panels use power to make each individual coloured pixel, so black would save power. Who uses a couple of 24" OLED's yet?
See http://electronics.howstuffworks.com/oled2.htm
And more interestingly http://www.popsci.com/scitech/article/2009-09/mit-scientist-explains-oled-function-glowing-pickle
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