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smartphone screen film

 
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nanometer



Joined: 30 Apr 2016
Posts: 288
Location: Tucson, AZ

PostPosted: Tue Jul 30, 2019 11:06 pm    Post subject: smartphone screen film Reply with quote

We were taking apart a non-working galaxy phone. There was a shiny metallic film under (and in contact with) the glass screen which we separated from the glass. We knew there was a pattern there from the diffraction off the surface, but I'm perplexed by what we see. I expected to only see a simple grid of pixels.

Mitty 20x, 2um steps, ring light on top of diffuser dome, sony A99, Minolta 80-200 tube lens at 200mm. Stacked with Zerene pmax. The larger square features are about 20um wide.



Steve
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Olympusman



Joined: 15 Jan 2012
Posts: 4324

PostPosted: Thu Aug 01, 2019 11:04 am    Post subject: Pattern Reply with quote

Very nice.

Mike
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Michael Reese Much FRMS EMS Bethlehem, Pennsylvania, USA
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 20288
Location: Richland, Washington State, USA

PostPosted: Thu Aug 01, 2019 11:13 am    Post subject: Reply with quote

I have not seen this before. It's a very interesting structure.

You say "pixels", but from the location and size of the grid, I'm thinking this is part of the touch-sensing system.

Are you talking about something like what's shown HERE?

--Rik
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nanometer



Joined: 30 Apr 2016
Posts: 288
Location: Tucson, AZ

PostPosted: Thu Aug 01, 2019 7:28 pm    Post subject: Reply with quote

Rik,

I don't think that is it. Here's a pic of the metallic layer folded back away from the screen, so it's the shiny side that was against the glass. It got cracked as we separated it from the window probably because we didn't know what we were doing. Anyway the above image is of this metallic layer.



Steve


Last edited by nanometer on Fri Aug 02, 2019 6:34 pm; edited 1 time in total
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Smokedaddy



Joined: 07 Oct 2006
Posts: 1499
Location: Phoenix, Arizona

PostPosted: Thu Aug 01, 2019 9:11 pm    Post subject: Reply with quote

AMOLED layer? There are lots of videos on Youtube how to disassemble these pups.

https://www.wiselyguide.com/amoled-lcd-better-screen/



-JW:


Last edited by Smokedaddy on Thu Aug 01, 2019 9:26 pm; edited 1 time in total
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rjlittlefield
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Joined: 01 Aug 2006
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Location: Richland, Washington State, USA

PostPosted: Thu Aug 01, 2019 9:23 pm    Post subject: Reply with quote

Smokedaddy wrote:
AMOLED layer?

That would make sense. Samsung says that Super AMOLED also integrates the touchscreen function.

See images at https://www.engadget.com/gallery/under-the-microscope-samsung-galaxy-s-iiis-hd-super-amoled-display/#gallery=50574&slide=542852&index=0

--Rik
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nanometer



Joined: 30 Apr 2016
Posts: 288
Location: Tucson, AZ

PostPosted: Fri Aug 02, 2019 6:26 pm    Post subject: Reply with quote

Thanks James and Rik. That image you have there James is very convincing. Using that, we can conjecture that what is left on my image is for capacitance sensing--which look to be the blue blobs that appear to have some circuitry inside of them. Big squares red, little squares blue, circles green.
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