Open the laptop up as much as you can and put a fan on it for a week to dry out completely. If you can do so, unplug the battery. Don't try turning it on during that time. You risk further damage.
Hopefully it will work fine afterward. I don't know if you did this already. But you may have irrevocably damaged it when you tried to turn it on after getting wet.
In the future. If a piece of electronics gets wet. Don't try to use it. Immediately power down and remove the battery if possible. Then let it dry in front of a fan for a week. Before you try to turn it on again.
If it is permanently damaged. Try an external monitor before replacing the screen. You have to figure out if it is a GPU problem or screen problem.