Do black pixels consume less power?

I have been vaguely aware of www.blackle.com, a website which uses google's custom search to provide search results.

Their claim to fame is that they have a unique predominantly black screen, which according to the creators saves energy.

In fact they came to prominence with a blog post titled "Black Google Would Save 750 Megawatts-hours a Year".

I was reminded of this site when I was reading an article on the BBC News website about them.(A two month old article).

In that article,they claim black pixels take less power than white pixels.

However, I could not come up with any thing that substantiated their claim.

So I ask you, do black pixels consume less power?

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