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LCD use back-lighting. When the screen is set to black, the back-lighting is still happening, it's just being blocked. And, as someone else pointed out, it can actually use more energy.Come again? You're telling me that a screen that has a picture that is emitting energy from every pixel consumes the same amount of electricity as a monitor that is emitting no light aside from the taskbar and desktop items?
That's like saying an off TV consumes the same as an on TV.
Furthermore, you are saying that subjecting parts of an LCD to less wear and tear doesn't make it last longer?
If you had a CRT, you'd have a point. But not with an LCD.
I'm not trying to jump your ****, I'm just trying to make you aware that you can go ahead and use a pretty picture and it's really not going to adversely affect anything. Your monitor's life isn't going to be extended by a black screen, and you're not going to save any energy. AND, even if you would save energy and "extend the life of your LCD", it would be so minuscule so as not to be noticed and probably not even measurable.
So, get some purty pics on there.