Mauricio,

Perhaps you could integrate a small piece of indium tin oxide coated 
film as the window to your display and use conductive sprays elsewhere.  
I just Googled on < +"indium tin oxide" +film > and had a fair number of 
hits.  I know that the people who manufacture display overlays for us 
(essentially a fancy label) use these kinds of films on some of our 
products.

Regards,

Dave

Mauricio Jancic wrote:

>	My theory is that ESD is being generated and when the user approach
>the machine a discharge is produced trough the 7 segment displays that you
>can see on the pictures in the OP links.
>	
>	So the problem I'm trying to solve is exactly how to protect the
>feeder to ESD in the normal use... Should I connect the plastic case to
>earth? Would it work?
>


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