Dark dot _inside_ the display?

Question

laptops

Today I noticed a dark spot on the display. I wipe - it does not wipe. If you look closely - bring the mouse cursor to this place, you can see that the speck of a millimeter is three deeper than the cursor, that is, _inside_ the matrix. I took a closer look and found several smaller ones, but with the same “depth” property.
What could it be?
A speck of dust outside, a broken pixel? It seems that no, because. along the Z axis, the object is farther from the observer than the image on the monitor.
Dust inside? If it is “behind” the matrix, then how can it be seen, is the matrix transparent?
The color is gray, approximately #777777 (when the dot is on a white background), but the color is not fixed, but "darkens" the picture on the screen, that is, on a black background (#000000) the object is still visible, and the dot becomes "even blacker" than surrounding area.

Answer 1

Dust between LCD matrix and backlight?

Answer 2

It is also possible that a small air bubble has appeared between the matrix and the back film. Has this speck been around for a long time? Maybe a marriage was made at the factory, and dust settled on the matrix during the assembly process.

Answer 3

I cleaned up those dusts. Really between a matrix and illumination. It is very difficult to remove them, there is a high probability of making it worse. In short: take out the matrix, humidify the air in the room, make a gap between the matrix and the backlight, gently puff with compressed air from the compressor (not from a can!).