je viens de trouver ca en ligne:
https://www.imore.com/does-new-ipad-pro-work-lg-ultrafine-5k
Donc apparement c'est pas compatible, comment convertir le signal USB-C to Thunderbolt? :(
The LG UltraFine 5K won't work with the iPad Pro because USB-C isn't Thunderbolt 3
The LG UltraFine 5K connects over Thunderbolt 3, which uses the same port at USB-C. But not every USB-C port is also a Thunderbolt 3 port. Such is the case with the 2018 iPad Pro. USB-C is present, but Thunderbolt 3 isn't. And because the UltraFine 5K requires Thunderbolt, it and the iPad Pro just won't play nice.
This isn't just a problem with the UltraFine 5K, either. No Thunderbolt 3 monitors will work with the 2018 iPad Pro.