Hi PabloCalvo,
From what you described in your original post, we recommend you try the steps in the link below since you're having an issue with your display.
If the screen isn't working on your iPhone or iPad
Next, we’d like to show you how to perform the recommended troubleshooting steps via the link above. Please click to open the link, then read through the steps in the section below.
1) Restart your iPhone or iPad.
2) Make sure that your screen is clean and free of any debris or water.
3) Disconnect any Lightning or USB-C accessories. If your screen works after removing an accessory, try using a different outlet, cable, or charger.
4) Remove any cases or screen protectors.
We recommend the steps above because they will show you what to do if the display on your iPhone isn't functioning as expected or doesn't look right.
If you're still experiencing the same issue, we recommend contacting Apple Support directly so that they can work with you to find a solution.
You can reach them by clicking here: Apple Support or calling the most local number in your region: Contact Apple for support and service
Thank you for participating in the Apple Support Communities.
Cheers!