Watch is vlack but fully charged
Apple Watch fully charged but screen black can feel vibration when message received
Apple Watch Series 6, watchOS 7
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Make sure you don't have Screen Curtain enabled. See t5he 'Use Screen Curtain on your Apple Watch' section in:
The first (and simplest) thing to try if something isn’t working right is to restart your Apple Watch and its paired iPhone. If necessary (device not responding), try a forced restart. Both methods can be found here:
How to restart your Apple Watch - Apple Support
Restart your iPhone - Apple Support
If that doesn't help, the next steps would be to unpair and pair your watch again and restore from the backup just created. This should result in no loss of data. It deletes all temp and corrupted files and re-indexes the file system.
Unpair and erase your Apple Watch - Apple Support
Set up your Apple Watch - Apple Support
If none of those helps, it may be a hardware problem with the screen. Your best option is to make an appointment at the Genius Bar in an Apple Store near you and let them look at it. If that is not possible, use the omen;ine Apple Support option. Either way:
Genius Bar Reservation and Apple Support Options - Apple