It’s funny. I noticed the lead screw coupler too and just assumed it was an odd place to mount an display screen, but hey, I’ve never heard of that printer so who am I to judge?
So now that I’m clear that it’s a resin printer, (which I’m even less familiar with), I would take it that the photo is of the [insert proper name here] part that cures the resin? i.e. it’s the UV source?
If so, then, as far as I know, resin printers work by producing a constant UV light source that cures (solidifies) the resin wherever the resin comes in contact with the UV light. As far as I’m aware, there is only one continuous UV light source and the light is “turned off” by blocking it with an LCD screen onto which is displayed a negative image of the layer being produced. LCD’s work by applying a small voltage to a matrix of tiny crystals which rotate in proportion to the voltage applied to them. Those crystal can then either not interfere with light or block it depending on the design.
If I’m correct so far, the black spots are areas where the crystal lattice has been physically damaged and are no longer rotating. You can’t fix it and there is no work-around.