Sunday, December 1, 2013

DIY Custom LCD

I've finished my first custom DIY LCD, and describe the process in this video.


12 comments:

sawjam said...
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sawjam said...
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bob said...

Great work

Alex said...

Hey Ben,
I've got a question regarding photo-resistive film, since you've been using it a lot in your projects from what i recall.

The basic question is how thick is a layer of such film, and what is the maximum thickness you can get from a single layer?

Now to expand a little upon the question:
I was wondering if its possible to reproduce a fingerprint from a fingerprint scan without the use of a high quality 3D printer.
The plan was to use a somewhat high quality laser or maybe inkjet printer to print the image of the scanned fingerprint, and then expose a layer of photoresistive film to it, develop it, etch it and apply a new layer on top of it and repeat the process.
The idea would be to get a sort of mold of the fingerprint while the needed accuracy is about 0.075-0.1mm detail, problem is i don't really know how photoresistive film behaves. (an alternative would possibly be to apply new layers of copper with a pre-applied film on it and just do it in a controlled temperature environment).
After having a mold producing a copy of the fingerprint using silicon or gelatin isn't hard.

The overall idea of the project is to demonstrate a security hole in the upcoming implementation of a biometric database by the government where i live, where basically a cheap and easy to make copy of anyone's fingerprint can be produced at home.

Railon said...

Hi! I am not sure if my youtube comment actually got posted or not so i am also asking here.
I want to do the freeze-drying as an experiment in school and i would like to ask some questions about how your experiment went. Is that okay with you? Thanks in advance!

Ben Krasnow said...

Alex, in the semiconductor industry "thin" photoresist is usually 1 micron thick, or less, eg 800nm. "Thick" photoresist is maybe 3-4 micron thick. The thickness is controlled by the photoresist's viscosity and spin-coat speed. You can apply multiple layers to build up thickness, theoretically without bound. Check this out: http://istouchidhackedyet.com/

Ben Krasnow said...

Railon, please ask your question publicly (G+, blog, youtube), so that everyone can benefit from the conversation.

Алексей Рукин said...

Is it possible to buy 1..10 grams of liquid crystal? Minimum order on Alibaba is 1 kg or more.

Ben Krasnow said...

This vendors sells smaller bottles: http://www.alibaba.com/product-gs/1458702385/Nematic_liquid_cristal.html I have not purchased small quantities of LC on Alibaba, so I couldn't say for sure how this will work.

UnderSampled said...

Do you think it would be possible to make switchable privacy glass like http://smarttint.com/ does? I would like some but I don't want to spend a whole $80 for one square foot.

Алексей Рукин said...

This LCD is not sealed at the edges. Is it possible to seal it completely like industrial LCDs?

Villa Nocito said...

Fantastic!!! Thanks!!!!

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