What is this coarse spot on the laptop screen ?

shaltzer

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Oct 24, 2009
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I have laptop Thinkpad T450s with matte IPS screen which I just bought. It's a secondhand item so no warranty.

I found out there are some coarse spots on the screen. If I scratch the spot using my fingernail, the surface feels coarse or not smooth. Since it's not smooth, so I guess it's not a debris trapped behind the screen ?

Here are the photos of one of them which is the biggest one:

1) Here I'm using white wallpaper:
http://i.imgur.com/kbzBywu.jpg

Here the spot color appears black.
There are also other smaller spots around it if you can look at them carefully.

2) Same spot but here I'm using black wallpaper:
http://i.imgur.com/I0ma8Qq.jpg

It's interesting that on the black wallpaper, the spot color becomes white. Maybe it's because of the screen lighting ?

On other light color background/wallpaper, it usually looks greyish.

My questions:
What is this coarse spot? Could be it's a crack on the screen ? Or is it a persistent dust or stain that stuck on the screen?

If it's a persistent sticky dust/stain, is there a way to clean it?
 
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