I believe it would work. The backlight would only come on when you press hard on the screen, and it doesn't have to come on at full brightness maybe ~1 nits. A certain phone maker already uses a less advanced 'knock knock' to wake the display so that's why I think it would work. Besides, if you're pressing/tapping the display, you'd want the backlight coming on anyway because you're either going to check notifications and/or unlock phone.. otherwise you wouldn't be pressing the display in the first place