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All of the scientific test data we have come across shows a slight saving on black LCD screens, which suggests that the rest state on many LCD screens does not allow light through. This is not the case, however, with LCD monitors, which have no phosphors and represent the lion's share of every new monitored purchased in the developed world, including those used by laptops. So if you're still toiling away in front of a hefty CRT monitor that takes up three-quarters of your desk, then black screens will save you some energy. However, "when the screen is black, you don't have to fire the beam," he adds. Instead, LCD displays rely on an array of thin-tube fluorescent bulbs that provide a constant source of light to create a white screen. Sign In See Subscription Options. To make it black, LCDs rely on a diffuser to block this light.

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