Way To Turn JUST The Screen Off?

Hi,
Suppose you're leaving your iMac rendering for some video, or encoding a video, and it's going to take a couple of hours, is there any way to turn the LCD screen off to save energy, without turning off the iMac? My immediate instinct is to push the Sleep button on the back, but this will stop the encoding, which isn't what I want to do.

Here it is:
Sleep Display Widget
and it's also available as an application.

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