Apple Watch doesn’t show image

Hi,

One day I put my Apple Watch on charge after it runs out of battery. When I removed it from the charger, it didn’t show any image, so I thought the charger wasn’t connected and didn’t charge at all.

But I started to get a notification and the watch started vibrating. At that moment, I realised that the watch just didn’t show anything.

So the Apple Watch is working but doesn’t show any image. Even the side buttons are working, so that I can activate Siri, hard reset etc.

Is this a common error, or the screen just “died”?

Thanks in advance!