Greenish strip down center of screen on S6 edge when under a black light.

[AC Question]

Last night me and my fiance went bowling for new years eve. They had black lights on in the ceiling. I had my phone on me and noticed with the screen turned off there is a greenish colored strip in the middle of my screen. It is about 2 inches long in the dead center of the screen. Anyone else experience this? My fiance has the regular s6 and his didn't have it. Any help would be appreciated. Thank you. Also...under normal light when the screen is off you can't see this grrenish strip. I'm confused as to what it could be.