Hey @ArnoG thanks for posting that.
Does this screen only work in one plane? For instance when holding your phone vertically, left to right is modified but up and down is not.
Or does it work in all 4 directions?
If yes, I think it works just like the LES (Light enhancement sheets) that Cinestill sells, which I believe are just cut down 3M Light Enhancement films that are often used in light up signage, and as computer privacy screens, etc. @Harry and I talked about it recently here on the forum. But maybe it is something different?!