There is an easy fix for this. It won’t stop it happening again, but you won’t have to reboot your phone. Tell Siri to brighten your screen.
On your iPhone 14, press and hold the button on the right side of the phone - It will engage Siri.
You won’t see the Siri animation on the screen - the screen will still be black.
While holding the button down, ask Siri to turn up the brightness - Actually say:
“Turn up the Brightness.”
Even though the screen is black, a slider will appear on the screen.
Slide the slider, to the right, to turn up the brightness on the screen.
It won’t stop the issue from happening again, but it works. You won’t have to reboot your phone.
this hasn’t happened to my iphone14Pro, lately. I switched from an after-market platform wireless charger back to the Apple MagSafe magnetic disc charger.