Why does the edge of the film on the inner screen of the Xiaomi MIX Flip show such colors as green and red?

Thank you for supporting the Xiaomi products. There is a slight fitting deviation between the film and the screen and it is notable that film tends to slip when folding the Xiaomi MIX Flip, which will cause the refraction of edge. The refraction of edge light will cause a slight rainbow edge phenomenon (such as green, red and other color edges), which is a normal optical phenomenon.