smartphone screen film

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nanometer
Posts: 317
Joined: Sat Apr 30, 2016 10:14 pm
Location: Tucson, AZ

smartphone screen film

Post by nanometer »

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.

Image

Steve

Olympusman
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Pattern

Post by Olympusman »

Very nice.

Mike
Michael Reese Much FRMS EMS Bethlehem, Pennsylvania, USA

rjlittlefield
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Post by rjlittlefield »

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

nanometer
Posts: 317
Joined: Sat Apr 30, 2016 10:14 pm
Location: Tucson, AZ

Post by nanometer »

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.

Image

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

Smokedaddy
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Post by Smokedaddy »

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

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

Image

-JW:
Last edited by Smokedaddy on Thu Aug 01, 2019 9:26 pm, edited 1 time in total.

rjlittlefield
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Post by rjlittlefield »

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- ... 52&index=0

--Rik

nanometer
Posts: 317
Joined: Sat Apr 30, 2016 10:14 pm
Location: Tucson, AZ

Post by nanometer »

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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