I made a picture of my screen in total darkness using a photo camera, 8 s exposure, and ISO 400. This way I could more or less capture how the black spots/strips appear on the screen.

The result:



Same image with levels enhanced in Photoshop for a better view of the dark areas (you don't see them so well in reality):



Do you guys think this is a big issue with the screen as visually it doesn't bother me? I never see them in normal conditions.