I am sorry for the weird question (I have never damaged any screens on any devices), but is there a way to understand if my FP has a superficial crack (within a plastic cover blocking blue light) or if it is deep and affecting the screen?
Hard to tell, but when I zoom into the picture, I seem to recognize a reflection (a “second” line) of the fracture/scratch to its left (best visible in the lower area of the picture). And I would think this suggests that it’s on the protector and this gets just reflected by the actual display glass surface.
Perhaps you could also try to “sense” with the edge of a paper tissue if the fracture/scratch stops it when you move the edge over the surface.
I’m not sure if it works out at all, but this is what I had in mind:
Move the edge of a paper tissue towards the scratch as if you wanted to push dust or snow away (like with a broom ). The edge should point towards the scratch so that the scratch should/might interrupt the movement like if it got into a tram rail.
The first line here shows the movement of the tissue edge (the / stands for the tissue edge), the second line the surface with the scratch/fracture symbolized by a small u:
← / ←
My idea is that if you do it carefully enough, the edge might start to stumble or stop once it gets “into” the scratch. But of course, the scratch might not be deep enough for that to happen, so you might get a “false negative”
This is almost certainly a broken screen protector. Mine looks the same and I know of another FP5 where the screen protector looks like this. If you don’t like these cracks, you can simply replace the screen protector.
If you want to protect your phone from damage in the future, I recommend you buy a phone case for your FP5.
But don’t buy the official case as it doesn’t offer any real protection due to its poor design.