My Iphone screen is really dark?

I have an Iphone 4 for about a year now and slowly over the last couple weeks my screen has gotten really dark and dark gray semi transparent vertical lines are taking over my screen. Its getting to the point where I can't see anything really.
I did accidentally drop it in the sink while the water was on but the darkness and lines started before that happened, and not much water got in/on it anyway.
I just want to know why its doing this?
I'll probably buy a new screen

Turn the brightness up in settings

The backlight led lights are damaged

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