What is this thing?

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UV Light on sister's phone; what's with the blue oval? (yiffit.net)

submitted 5 days ago by [email protected] to c/whatisthisthing

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Sister was messing around with a UV light and noticed this on her phone screen under it. My phone does not have this (all I get is a grid of dots I'm pretty sure are to do with the touch screen).

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[–] ch00f 18 points 5 days ago

OCA (optically clear adhesive) is spread as a thin layer between the digitizer and display. Any gaps would be easily visible with the naked eye.

Also, it’s cured with UV, but I’ve never seen it fluoresce.