Author Topic: Connection to Electrodes on Glass  (Read 872 times)

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Offline nickbildTopic starter

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Connection to Electrodes on Glass
« on: September 05, 2019, 12:49:03 am »
I need to make an electrical connection from electrodes on glass to a 22g wire.

See attached image -- it's the internals of a Nokia 5110 LCD.  At the bottom are the electrodes on the glass plate.

827199-0

Does anyone know a good way to make this connection?  The electrodes are paper thin and the surrounding material is glass, so I don't think soldering is the answer.

Thanks in advance!
 

Offline OM222O

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Re: Connection to Electrodes on Glass
« Reply #1 on: September 05, 2019, 12:54:10 am »
you do have to solder them! but not with normal methods. usually a hot bar is used to solder a flex cable to it. your only other option is welding bond wire which can not be done in a home application.
 

Offline nickbildTopic starter

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Re: Connection to Electrodes on Glass
« Reply #2 on: September 05, 2019, 12:58:41 am »
Thanks for the info.  I'm hoping there is a solution more within the reach of a low-skill hobbyist such as myself.  Maybe something along the lines of conductive glue reinforced with epoxy might work?  This is by no means for a commercial product.
 

Online oPossum

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Re: Connection to Electrodes on Glass
« Reply #3 on: September 05, 2019, 01:06:22 am »
The 5110 LCD uses a zebra strip. You don't have the whole assembly.
 

Online oPossum

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Re: Connection to Electrodes on Glass
« Reply #4 on: September 05, 2019, 01:11:19 am »
 

Offline nickbildTopic starter

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Re: Connection to Electrodes on Glass
« Reply #5 on: September 05, 2019, 01:24:11 am »
I do have the full assembly, but I disassembled it.  :)

I don't want to connect to pads on a PCB, but rather connect to wires (I don't want a PCB behind the screen), so that's why I'm looking for an alternate connection method.
 

Online oPossum

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Re: Connection to Electrodes on Glass
« Reply #6 on: September 05, 2019, 01:27:43 am »
Z-Axis tape to a flex cable may work.

https://www.adafruit.com/product/1656
 

Offline nickbildTopic starter

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Re: Connection to Electrodes on Glass
« Reply #7 on: September 05, 2019, 10:19:30 am »
That sounds way less tedious and error prone than my plan.  I'll give it a try, thanks!
 

Online mikeselectricstuff

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Re: Connection to Electrodes on Glass
« Reply #8 on: September 05, 2019, 10:29:29 am »
conductive epoxy
Youtube channel:Taking wierd stuff apart. Very apart.
Mike's Electric Stuff: High voltage, vintage electronics etc.
Day Job: Mostly LEDs
 

Offline nickbildTopic starter

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Re: Connection to Electrodes on Glass
« Reply #9 on: September 05, 2019, 10:32:43 am »
Conductive epoxy/glue was one of my first thoughts too!  I think the 1mm pitch may make that a bit challenging to do though, so I'm going to try z-axis tape first (which is new to me, but looks awesome).  Maybe some non-conductive epoxy over the top if it needs more mechanical strength.
 


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