About Me

My Photo

I previously worked on Virtual Reality and other hardware at Valve.  I currently work at Google[x].

Prior to starting at Valve, I built computer peripherals such as keyboards, mice, and joysticks that were designed to be used inside MRI machines.  My company, Mag Design and Engineering, sold these devices directly to researchers at academic institutions who used them to publish scientific papers in peer-reviewed journals.

After work, I spend time on many different types of projects that usually involve circuit design, machining, material selection, and general fabrication/hacking.  My favorite place to be is my home workshop.

ben dot krasnow at gmail




Sunday, December 1, 2013

DIY Custom LCD

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


  1. This comment has been removed by the author.

  2. This comment has been removed by the author.

  3. 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.

  4. 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!

  5. 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/

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

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

  8. 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.

  9. 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.

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