Why has my GS4 touchscreen stopped working?

i turn off my phone and when i turn it back on, the lights worked but the screen was black(the screen is not cracked). Now the lights wont work and the screen is black. When i turn on the phone, the blue light shows and after that nothing. I could still hear and it charges, it's just the lights, the screen is black (can't answer calls or anything). I have dropped my phone various times before, but i didnt dropped it when it stopped working. later on, it turned on, but i have to have the light all the way up to see anything(everything looks like a light color almost fading) if i have the light down, the screen is dark blue almost black. The touch screen works but the menu and back key dont work. i dont what it could be

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