If you have a pro controller, you can push the home button when in game, go to controller settings, and click "display off". As long as you don't press any buttons on the gamepad and just use the controller, the gamepad screen will just stay turned off. This is particularly handy for Breath of the Wild because you still have to keep the gamepad close in case you run across one of the gyroscope puzzles, so it's more than likely flashing somewhere in your peripheral vision.
I know @vinny was complaining about this in the Beastcast and I've seen people bring it up a few times in the forums. As far as I know, this works for pretty much any game where the gamepad screen has no functionality.
Hope this helps someone!
EDIT: Why did I make this a question?
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