How to deacitvate mac-screen while its mirrored to tv?

Is it possible to deactive (black-screen) the mac while i am streaming/mirroring onto apple tv? I am asking for a kind of standby function, so that there aren't both units activated - just my tv.
Regards

okay, nice try. worked okay.
but i was wondering if it is possible to use apple tv like a projecter - switching off the mac-screen and just displaying the content of it on television.

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