LG V20 phone faze

I woke up one morning and i went to look at my phone, it wouldnt charge or turn on for an hour, but i left it charging. After 3 hours i tried turning it on again, and it turned on. Though the top right of my screen is normal brightness, and the rest of my phone is really dark. Its kinda like a faze. Its been around 2 months since i found my phone like this and its still the same. Ive tried turning it off all the way and wait a couple minutes, and turning it back on didnt help. My phone now dies at different charges. Sometimes 40% sometimes 20%. Any help i can get would be awesome!

Recap: top right normal brightness, rest of screen is really dark, as if one turned the brightness down all the way, and Dies at a high charge.