How can I make my screen turn on

So I have an LG Stylo 3. I shattered the screen a while ago, but other than cosmetically, it is perfectly fine. (Was until about 20 minutes ago) I was sitting on my bed and got a snap chat and when I went to check it, the screen wouldn't turn on. the back light is working, my screen is lighting up, just turning a few shades lighter than when its off. the FInger print scanner is working fine as well. I know my phone is still working because I can hear the notifications coming through, but i can't see anything. I've restarted my phone and was going to do a hard reset because its all I havent tried yet, but I cant see my power off option or anything for that matter to actually do it. I'd rather not lose the memos I dont have backed up as they are important for work, but I'd more rather be able to actually use my phone and not have to buy a new one as I havent had this one for very long. So I'm open to pretty much any suggestions