One day I was playing with my phone, and a drop of water landed on my screen. That little water drop formed a little microscope, so I coud see my phone screen pixels. That water started this project, because after that I wanted to look more and more smaller object on it. I desided I want to photograph what I will see on that screen.
I work in the display industry, but I never saw with my own eyes how a screen really works. I was interrested about the electrical side of a screen, like how they could operate that much pixels in the size like phone.
Because of my work I saw some thin firm transistors on a layer of screens, and also a bit of research I knew what to look for.
I was thinking about how to make a cheap big magnification microscope. It was not easy, but I rememberred the CD readers head has a really good optic in it. I started playing with my Iphone screen and a cd reader head, I could saw much more details then before, but that was not enough form me then. After I tried with the same optic with my Iphone 7 plus camera so I started photograph. I had a cheap chines LCD touch screen for an arduino uno what I never used for any project, so I made a sacrifice. I used the cheap screen back light to light the screen then placed the microscope optic, but the result was not the best. I only could see the red, green and blue pixels, nothing else.
After a lot of struggle, I found out the screens usualy built from two glas layer between the liquid cristals. The top glass has black masking where they want to hide the controll circuit. That mean between two sub-pixel it is black area. The problem with this the transistors and the conbtroll lines are between thees pixels, so I could not saw them.
Then I disassembled the screen and removed the front LED backlight and all the polarizer films from the front and the back also.
With this I coud see the transistors and the lines from the back side, but the problem was still that black masking around the pixels I tried to see from the top.
I had no chance and had to try separate the top and the bottom glas layer. It was fearly easy with a sharp blade.
Then lets see what cold I achive with this:
Not so bad right? I achived this with a CD reader head optic a RGB led and my phone camera.
The CD reader head has a good option because it is reflective optic, so it usually has a laser what is shining down to the surface then the light comes back to a photo transistor, and that how it detect data on CD surface. This point I replaced the laser with a RGB led and I removed the photo transistor also and ther went my phone camera.
This picture was created from several picture combination, that why it is not perfect.
Then I decided to improve the sistem by adding X - Y movement to, so I could search for interresting parts.
I had an old pen plotter what long time I was looking for where can I use it.
I modified the controll electronic with a modern arduino CNC shield, so then I can write software for it.
Also needed USB camera instead of my phone camera, so I was looking for a cheap solution and I found a usb microscope camera, I knew it is not so great, but it has magnification already and I did not needed big resolution, you will understand it later why.
I was learning Python OpenCV for a couple mounth so I know I will capable of controll everything from python. I wrote a little code for move the X - Y movement like a scanner head then I took pictures with the USB microscope and converted it to gray and it added it them, so then I finally could take high resolution photos like this:
It is not so beautiful, but can be seen what needed.
A little explanation what are you see exactly:
1: One sub pixel
2: One sub pixel switching thin film transistor.
3: Connection piont to connect the liquid cristal picel to the transistor
4: Controll line ESD protection transistors
5: Line controll line
6: Row controll line
For easier on drawing it is looks like this:
Because the images...Read more »