I don't know how it got discolored.. One night, I turned on my laptop.. And.. It was just there.. :/ The very first day I saw it.. I freaked out and started touching the screen. Then I felt some crud on it.. Probably residue from a sticker or something.. (...idk why i would have a sticker on my screen though) and so i scraped it off.. and the screen seemed to get better.. but then it quickly came back, although less dis-colored than before. and so.. i pressed firmly on the opposite side of the screen (the cover part for the laptop..) and it went away.
I've read that discoloration is often caused my.. Some kind of magnetic force.. ~_~; So.. Would it be because of something magnetic?..