I Quetelet rings on LCD displays?

[Orthoceras]

When shining a flashlight at particular LCD displays, an interesting interference pattern appears, consisting of parallel or concentric lines. It closely resembles Quetelet rings seen on dusty mirrors and glass panes. Quetelet rings are formed when light from a dust particle interferes with the light from its mirror image.

For example, when shining a flashlight at a digital whiteboard (brand Prowise), such a pattern appears. When moving the flashlight in circles around your eye or the camera lens, the pattern will rotate, without any preferred direction. If you move the flashlight laterally towards your eye or the camera lens, the distance between the interference maxima increases, as illustrated in this video (link). The digital whiteboard was clean, no dust on the glass, so the necessary condition for Quetelet rings seems to be missing.

C is the position of the mirror image of the camera lens, Ln is the position of the mirror image of the flashlight. Top - camera and lamp equally remote from the screen: interference pattern consists of straight lines. Bottom - camera closer to monitor than lamp: interference pattern consists of concentric circles.I saw the same interference pattern on two laptops, Asus Vivobook Flip 14 and Lenovo Chromebook Ideapad Flex 5. Here too, any dust had been wiped off the screen, so that Quetelet rings were not to be expected.

In summary, two questions are:
1) is it right to call the interference pattern that appears on these LCD displays Quetelet rings?
2) how does this pattern arise at these screens? Which 'particles' have replaced the conventional dust particles? Google wasn't very helpful.

 

[Baluncore]

Which 'particles' have replaced the conventional dust particles?

You may be seeing the random dust effect from a transflector, used in low-power all-light-readable displays.

The transflector is a part-silvered scatterer, formed by random deposition on a layer of polymer. It is placed in front of the backlighting, at the back of the LCD sandwich.
https://en.wikipedia.org/wiki/Transflective_liquid-crystal_display

 

[Orthoceras]

You may be right, but I am not sure what the equivalent particles are, and how they could be photographed. For the time being I prefer thinking the equivalent particles are actually etched micro pits into the smooth glass surface, created for a matte appearance. I took the picture below with my smartphone and a tiny macro lens, accidentally at the right focal distance. Recording it was difficult because my smartphone has an autofocus that seems to avoid focussing at this very narrow surface layer depth.

 

[Tom.G]

try this search:
https://scholar.google.com/scholar?hl=en&q=Quetelet+rings