Alcohol problems

So, I was rubbing off a sticker from the back of my phone using a small towel dipped in pure alcohol. This phone is supposed to be waterproof and I put my back cover on the front for extra security. But, after I was done, dried it and everything, I realized that some alcohol had gotten inside the screen, I have no idea why. The whole display was dark pruple-ish and covered in stains and some weird things like dark dark spots and lines. I researched it ans found out that it was okay because alcohol evaporates really easily, so I decided to use it for a bit, since I have huge overheating issues (often going up to about 45-50°C upon usage). After half an hour of usage (it had gotten pretty hot), the display seemed to become a little bit clearer and less dark, but I decided that I should stop using it in fear of moving some bubble or ruining my already dying screen, so I put it to charge and left it alone. I was relying on my country's hot weather to finish the job, and I was checking on it every once in a while. At first, it seemed to get better but suddenly, after about 2 or 3 hours, the screen stopped turning on at all. Neuther the display nor the touch were working anymore, but sound (modifying volume) and vibration (haptic feedback for holding down "power") worked really well. I tried to restarted (volume up + power), but nothing more than some vibrations and jingles. Currently, my phone is turned off (volume down + power) and I'll leave it like this overnight, to see if anything improves tomorrow.

So, I need to know. Is my screen ruined and needs changing, or simply evaporating the alcohol will fix everything? Also, if I have to change my phone, is there a way to use HTC backup to transfer data without the "old" phone?
Thank you in advance!