Why is there a green rectangle outline on phone screen under black light?

[Android Central Question]

When under a black uv light, there is a green outline of a rectangle showing on my moto g play 2021 phone screen? What is causing this?

 

[mustang7757]

Your using a black light lol
I'm curious what made you use this to see your screen ? Almost No one I hear does this.

Please post a screenshot if u can

https://forums.androidcentral.com/showthread.php?t=413366

https://forums.androidcentral.com/showthread.php?t=409154

 

[B. Diddy]

Welcome to Android Central! Is it always there, even if the phone is off?

 

[1mrh]

I believe it is there with phone off or on. Room had a black light in it and the green rectangle appeared on black screen, about 1/2" from the edge of phone all the way around. Was not on someone else's phone they had out. Another site I came across mentioned this happening and someone suggested that it was the optical glue used on the inside of screen, but don't know if that would be a possibility.

 

[B. Diddy]

That sounds plausible. In any case, it's almost certainly an artifact of how the phone was constructed. Since you presumably never actively use the phone under a black light, it shouldn't affect the phone's integrity or performance.

 

[mustang7757]

I believe it is there with phone off or on. Room had a black light in it and the green rectangle appeared on black screen, about 1/2" from the edge of phone all the way around. Was not on someone else's phone they had out. Another site I came across mentioned this happening and someone suggested that it was the optical glue used on the inside of screen, but don't know if that would be a possibility.

Welcome to AC, I'm curious so ill check this out tomorrow as I have a black light that I use when I put dye in vehicles at work to check for oil leaks, freon leaks, etc..