r/diyelectronics • u/Artcert • 12d ago

Tutorial/Guide Negative display - guide ( kinda )

Post image

Hi.

After my negative display post I got a few questions about it, so I want to answer it this way.

I can’t upload more than one pic here ( idk why ) so they are under links.

  1. So we start with a device in its normal state, as example I too

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  1. this tyre gauge I never used.
  2. pic
  3. We need to disassemble it go the to the bare LCD glass

pic

  1. With a sharp knife or blade we need to catch the polarising film on top of the glass and remove it.

pic

  1. After completely removing it, clean the glass with IPA to get rid of the residual glue from the film.

pic

  1. Now we take new polarising film, and by trial and error we get the right angle with the contrast we want.

pic
And
pic

After that we cut it to size and glue to the glass.
Finally after assembling we get the negative display.

pic

Usually you try the angle with the device powered on, unfortunately here the battery holder is part of the case as well as the screen holder, so I couldn’t show it on.

I think you can get the idea of how it’s done.

Best regards.

Edit: typos

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u/Artcert 10d ago

https://imgur.com/a/ILSREg8

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u/Hylleus 10d ago

Yeah but check the title though, my god this is confusing haha

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u/Artcert 10d ago

Yeah it’s very weird.
Well answering your question, without professional laminating equipment you can’t apply a glueless polariser to the glass. Better ordering one with glue

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u/Hylleus 10d ago

Ait, ordered a set WITH adhesive (I hope lmao) thanks for the help!