Black computer screen saves more energy?

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Hi all, There is a website www.blackle.com that claims that it saves energy because the screen is predominantly in black. Image displayed is primarily a function of the user's colour settings and desktop graphics, as well as the colour and size of open application windows; a given monitor requires more power to display a white (or light) colour screen than a black (or dark) screen" Roberson et al, 2002.On its about page, it provides a link to blog post that proposed a theory that a black Google search engine would save a fair bit of energy since it is a search engine with high popularity. The Blackle website has a statistics of the watt of energy saved while its being used. However, in my view, the energy saved is limited as we don't spend a lot of time on search engine. Unless all the websites online are in black, little energy will be saved. It's too dull to have all websites with black background. The website will earn a fair bit through Google Adsense if more people use it.