Here’s an portable app created by Factor Mystic to quickly turn-off your monitor with just a press of a hotkey / key combination..
It is called Turn-Off Monitor, it is really handy a useful app..
Download it Here, and run it, press a key combination you want, click save, then hide.
It will sits in your system tray (like the preview above post)..
every time you press the key you have saved it will execute the command, which is to Turn-Off your monitor 😀
to turn back on your display, just move your mouse or press any keys..
(Note: .NET framework 2 or above is required)