This thread shows you an apparently yet unresolved problem of Thinkpad business laptops. Over the years I have seen lots of IBM (T23, T42, T43) as well as Lenovo Thinkpads (X220, X220T, X230, X230T, X240) where the keyboard/keyboard bezel caused imprints and scratches on the screen. This - in my opinion clearly a failure of the product designers behind it - is particularly annoying considering the fact that these laptops are not at all cheap.
In this case, I found the problem in an early-2015 X250 subnotebook after not even six weeks of normal (!) mobile usage...it has even been transported in a clean polstered notebook bag when not in use btw.
This is how the machine looks like:
The unit features a very flat design - so flat that the keyboard keys actually can touch the screen when the lid is closed. This would not necessarily have to be a problem if the laptop would always stay at home - but then their are two things:
The keyboard keys, especially those new Thinkpad chiclet keys, have very defined, less curved edges and additionaly they get very greasy over time and catch a lot of fine dust. Together with this grease/dust mix - I´ll call this LCD abrasive from now on - they are great for polishing matte LCDs under certain circumstances, sadly...
IT IS A MOBILE DEVICE, LENOVO! DAVID HILL!? -> And then there might at least be some vertical pressure on it in every transport bag. On each of your footsteps, your bag is shaken a bit and the laptop inside is moved in its sleeve and/or its lid is depressed a bit onto the keyboard. Let´s look at the consequences for the LCD screen...
Hard to take good photographs here, but I think you can see the marks from the keys (orange) and the Trackpoint buttons (blue).
Above from a slightly different perspective. To see how the LCD abrasive affects the screen surface, I took some micro-photographs. As you can see in the picture below, the non-glare/matte IPS panel has a fine-textured surface which looks like a starry sky at night when intact.
On the spots in the center, where the Trackpoint buttons did their polishing, this star pattern is missing completely causing the spots to become shiny.
And it even gets worse. The scratch above (centered) is what happened after a grain of dust (maybe of salt during lunch?) landed on the keyboard bezel and moved over the screen while the laptop was carried in its bag. Seen from another perspective:
And under the microscope:
I hope Lenovo will do some serious design reconsiderations in their future "Retro"-inspired Thinkpads - getting the distance between keyboard and screen anti-scratch-proof will be a good thing...I´m looking foward to it ;-)