4w ago

UV Light on sister's phone; what's with the blue oval?

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).

60 comments

All glowing unknowns under a UV light are considered Cum unless proven otherwise
- Can confirm this is cum
  
  Their sister's cum.
- is making sure the internal Cum is perfectly shaped a desirable job at the factory, i wonder?
  
  The real desirable job is the guy who gets to cum in phones
  
  That's just from setting the glass. Totally natural phenomenon.
  
  Depends, are you at the phone factory or the cum factory?
- "Oh man, it glows?"
  -WKUK

Not sure what it might be but shape and position match those of the wireless charging coil.
- That wouldn't be behind the screen nor rectangular
  
  Charging coils can absolutely be rectangular.
  
  Oh, I thought that OP was asking for the circular shape, the rectangular one looks more like some short of graphic showing on the screen. But maybe the circle is just the reflection of the flashlight?
- Wouldn't that be on the back side of the phone though? I suspect the battery would be between the coil and the display, making it impossible to see from this side under any kind of light.
  That said, I donno WTF we're seeing.
- That would be my guess.
  
  No, that was my guess!

Might be the glue holding it in place.
- 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.

What model phone, it might be the fingerprint sensor?
- What I wondered, but double checked pixel 8 and 8 pro specs and it just has a normal sensor area towards the bottom of the screen.

Is there a screen protector?
Else this might help narrow things down
https://www.ifixit.com/Guide/Google+Pixel+8a+Screen+Replacement/173219
Assuming it's the top piece that's different, the difference would be between these two parts
https://www.ifixit.com/en-ca/products/google-pixel-8a-screen-genuine?variant=43735546953925
https://www.ifixit.com/en-ca/products/google-pixel-8-screen-genuine?variant=42483463651525

Does she have a screen protector? Can you see the shape at all without uv light? My guess would be an air bubble under a screen protector, but that would be visible under normal condition, sometimes it could be hard to see.

Here's mine (Xiaomi Mi 10):

It has no screen-protector. It does not emit blue light from the glass edges. In the center I think it's slightly bluer than the rest of the screen. It is an amoled screen. Hope this helps somehow.
I dont know if they stick the glass with uv glue, they tend to do that with screen protectors for screens with curved edges, so that the protectors sticks better. Maybe it's the glue reacting.

Would have been a lot more fun if the hand was speckled with suspicious white stains!

The way it’s off center and out of focus, it’s probably a lens flare.
- Dude your mom’s probably a lens flare

Google Gemini says:
The oval shape you're seeing on your Pixel 8's screen when exposed to UV light is likely due to the adhesive used within the phone's display assembly. Here's why:
UV-reactive adhesive: Many modern phones use adhesives that contain fluorescent materials. These materials glow when exposed to UV light.
Display layers: The adhesive is typically used to bond the various layers of the display (such as the glass, touch sensor, and LCD/OLED panel) together.
Visible pattern: The pattern of the adhesive can sometimes be seen as an oval shape or other pattern when viewed under UV light. Important Note: While this is a common occurrence and generally harmless, it's always a good idea to avoid prolonged exposure of your phone to UV light. Excessive UV exposure can potentially damage the phone's screen or other components over time. Let me know if you have any other questions.
- OCA is applied from edge to edge. If it was the adhesive, the whole screen would be lighting up. Also, OCA is cured with UV light, but it doesn’t fluoresce.
  
  Well I don't want to paste another Gemini response as Lemmy seems to hate it so (and I do too when someone is pretending like the text their showing is isn't LLM created, when it is.)
  Anyway I rephrased the question and added your info to it. It suggests the shape might be due to a polariser film, but I don't agree with that as it too would fill the whole screen.
  Gemini points out that it might be another part of the screen stack. Which I wouldn't agree with. When you buy a replacement "screen", you're actually buying a stack of components and maybe one of those assembly processed uses a UV-fluorescent glue or component.
  Who knows imagine a shruggie here im too lazy to copy one and then get the formatting right so it shows up properly even though I now realise it would've been faster to do that than write this sentence
- Why are you getting downvoted? Because it’s an LLM response? There are others here that have suggested some of the same as this LLM response and they’re not being downvoted, so is it just the “AI is bad!!1!!!1” reaction?
  (Serious question)
  
  For me it’s not “AI bad” it’s a matter of coming here to talk to other people and to read what other people are saying.
  If I wanted to hear what ChatGPT or Claude thinks, I would go ask them.
  I’m fine with “I checked with a LLM and it suggested screen adhesive.” I guess. Things describing one’s experience. But just dumping output… sigh.
  
  The AI is definitely why. It's not well liked on Lemmy and Gemini is especially bad when it comes to credible information.
  That said, I'm sure this is one rare occasion where it's probably the right answer. Glue is really the only thing anyone has suggested that makes sense to me, as it's the only thing that would be where it is and glow under UV light. Well... I guess it could be cum. 🤔
  
  Probably. LLMs are good at summarizing search results - but they represent everything as true whether it is or not.
  
  You can never trust a factual response from an LLM. Plain and simple. It'll answer with confidence whether the information it comes up with is true or false.
  Commeters presenting its answer as fact is not helping a discussion based on finding the answer.
  
  I don't really care.
  I've been using Gemini on my phone now just to test how good it is.
  It still hallucinates quite a lot, like wrong dates for movie releases or stuff like that, but a lot of the times it's actually been useful. Cooking related things it does pretty well, as the info on those isn't really that varied and never political or anything so.

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