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Thread: Electric Window Tint

  1. #71
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    Quote Originally Posted by Sadman2 View Post
    Having studied Electronics for a while and done some research, I can say almost without a doubt this is possible...and affordable.

    Anyone else with any knowledge care to help with a project on this?
    Well you just need to put a polarizing crystal goo inside of 2 planes of glass. I doubt you could get it into a screen/film as of now.

    However I think this, combined with the "flexible OLED paper" will eventually lead to flexible polarized crystal, meaning this could be applied as easily as tint with 3 wires running down.

    To visualize what I am saying, have you ever taken 2 sheets of polarized film and looked through them both at the same time? Then rotate one of the films and the image through the films will get darker and darker and darker, and then no visible light can pass through, then it will get brighter and brighter and brighter until almost all visible light will get through (will still be darker of course), and then risne wash repeat.

    So basically you will need to get 1 polorized sheet fixed permanently. The other sheet will need to be able to polarize differently depending on the voltage or current going throught it. Sort of like an LCD. That is how this works.

    Also called "Smart Glass" I believe.
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  2. #72
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    Heres more on the subject thanks to "howstuffworks.com"

    To create an LCD, you take two pieces of polarized glass. A special polymer that creates microscopic grooves in the surface is rubbed on the side of the glass that does not have the polarizing film on it. The grooves must be in the same direction as the polarizing film. You then add a coating of nematic liquid crystals to one of the filters. The grooves will cause the first layer of molecules to align with the filter's orientation. Then add the second piece of glass with the polarizing film at a right angle to the first piece. Each successive layer of TN molecules will gradually twist until the uppermost layer is at a 90-degree angle to the bottom, matching the polarized glass filters.

    As light strikes the first filter, it is polarized. The molecules in each layer then guide the light they receive to the next layer. As the light passes through the liquid crystal layers, the molecules also change the light's plane of vibration to match their own angle. When the light reaches the far side of the liquid crystal substance, it vibrates at the same angle as the final layer of molecules. If the final layer is matched up with the second polarized glass filter, then the light will pass through.

    If we apply an electric charge to liquid crystal molecules, they untwist. When they straighten out, they change the angle of the light passing through them so that it no longer matches the angle of the top polarizing filter. Consequently, no light can pass through that area of the LCD, which makes that area darker than the surrounding areas.

    Building a simple LCD is easier than you think. Your start with the sandwich of glass and liquid crystals described above and add two transparent electrodes to it. For example, imagine that you want to create the simplest possible LCD with just a single rectangular electrode on it. The layers would look like this:

    the different layers in an lcd



    The LCD needed to do this job is very basic. It has a mirror (A) in back, which makes it reflective. Then, we add a piece of glass (B) with a polarizing film on the bottom side, and a common electrode plane (C) made of indium-tin oxide on top. A common electrode plane covers the entire area of the LCD. Above that is the layer of liquid crystal substance (D). Next comes another piece of glass (E) with an electrode in the shape of the rectangle on the bottom and, on top, another polarizing film (F), at a right angle to the first one.

    The electrode is hooked up to a power source like a battery. When there is no current, light entering through the front of the LCD will simply hit the mirror and bounce right back out. But when the battery supplies current to the electrodes, the liquid crystals between the common-plane electrode and the electrode shaped like a rectangle untwist and block the light in that region from passing through. That makes the LCD show the rectangle as a black area.
    So for this application we would just need 1 pixel so the cost would be pretty low I would think.We dont need to get really tiny sqaures in there. Of course you would just leave out the mirror. I think that would allow light to pass all the way through.
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  3. #73
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    Sounds like a good idea. I am just wondering about the environment that you would need to manufacture something like this. Any dust particles, that deposit on the glass while applying the different layers, will probably show up afterwards....
    Also, where would you get liquid crystals and clear electrodes from? I wouldn't know a place for that.
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    car window film

    Can any one suggest the address of film makers/suppliers who can supply these films which become opaque and clear on supply of some electrical power to it
    ``[email protected]''

  5. #75
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    doesnt maybach or some major expensive car place have something that goes to black when its activated?

  6. #76
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    Quote Originally Posted by prathore View Post
    Can any one suggest the address of film makers/suppliers who can supply these films which become opaque and clear on supply of some electrical power to it
    ``[email protected]''
    doesnt exist in a film. Where are you getting that crazy info?!

    Quote Originally Posted by americasfuture2 View Post
    doesnt maybach or some major expensive car place have something that goes to black when its activated?
    Yes, but it isnt film. It is the entire pane of glass.
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    Can any one suggest simple way to coat electrically conductive optically transparent film/glue/epoxy on glass? where do I get such materail? any simple oxide of metal which when applied with some glue will work. May be less transparent
    ``prathore[email protected]''

  8. #78
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    Quote Originally Posted by prathore View Post
    Can any one suggest simple way to coat electrically conductive optically transparent film/glue/epoxy on glass? where do I get such materail? any simple oxide of metal which when applied with some glue will work. May be less transparent
    ``[email protected]''
    no it doesnt exist yet. You are welcome to try. The closest thing I can think of is a flexible OLED roll, but unless you are the government, you cannot afford it.
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    Thanks for reply where do I get OLED?

  10. #80
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    Quote Originally Posted by prathore View Post
    Thanks for reply where do I get OLED?
    YOU CANNOT!!!! This is the film they are using in flexible paper right now. You would need that without the backing. And it can only be made in small sheets and in a research lab. It is not for sale you bafoon!

    if you really want to do this, get 2 panes of glass, squezze some liquid crystal inbetween and stck some wires. Make it yourself. It is no tint. It is not easy. And it will be on/off only.
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    30 Digital Outputs -- Directly drive a relay
    15 Analogue Inputs -- Read sensors like temperature, light, distance, acceleration, and more
    Buy now in the MP3Car.com Store

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