User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-24.209.217.67-20130221212141/@comment-188.22.159.126-20130221221022

You can turn off the display of the Gamepad while playing with the pro controller by pressng home, gong into the controller menu and selecting "turn Gamepad display off".

It will turn on again if you press a button on the Gamepad though.