Over the past weeks, a line of black/turquoise pixels has appeared on the left of the LCD screen of my 2-year old Lenovo laptop, and has slowly spread into the stain photographed below.

However, it does not seem to be "dead" pixels, since images are still visible underneath. The zone does not appear on screenshots.

What could cause this, and why is it spreading ? Is there any way to fix it ?

  • 2
    Looks like the screen's cracked & leaking
    – Tetsujin
    Jun 2, 2017 at 10:55
  • 1
    This should the same problem and answer as superuser.com/questions/1176064/… (I also answer to 'Is there any way to fix it ?') A lot of Lenovo displays use TN TFT displays. if you give the brand I can check it.
    – Jonathan
    Jun 8, 2017 at 14:32
  • @Jonathan It is a Lenovo b590. Well spotted!
    – Klaus
    Jun 11, 2017 at 21:28
  • from the database your display is N156BGE-L11 (use this reference if you plan to change the screen) and indeed a twisted nematic. ref: lcdtech.info/en/data/…
    – Jonathan
    Jun 12, 2017 at 7:26

1 Answer 1


You probably have a leak or fracture in the liquid crystal layer of your monitor causing it to loose fine control of the light blocking ability of the liquid crystals.

Your display has many layers. One of those layers is a liquid crystal layer that can be controlled in order to block or allow light to pass through to the actual coloured pixel layer. If you can see some kind of image then the light emitting layer is okay as is the actual pixel colours. As you have some image it is quite likely that there is some crystals moving to allow a tiny amount of light through, but not enough to make a reliable image.

enter image description here
from http://www.electroschematics.com/5666/liquid-crystal-display/

enter image description here
from http://www.maxi-pedia.com/TFT+LCD+display+monitor+panel

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