A week back, I went to the swimming pool and even though everything was firmly shut, some water got into the sim card and sd card slots, along with some condensation on both cameras.
As a result, I kept everything in rice overnight and all the water went by the next morning. As I turned my screen on, a bluish tint spread across the whole thing, and started flickering while I was on the lock screen. I turned it off and later in the evening when I checked it, it was normal for a few seconds after which the same thing happened. It gradually worsened.
As of now, the WHOLE screen is negative, and there is no option in the Accessibility section to reverse it, if that is the problem.
Nothing else is wrong and I restored my phone to factory settings, with no change.
Xperia Z1 C6903
The screen turns COMPLETELY photo negative, like how you edit a photo to change it to negative.