Capacitive touch screen explanation please

  bumpkin 13 Mar 13
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Hi all, not a problem as such just like to know the reason. I have a tablet with a capacitive screen, using a finger or a conductive probe/stylus it works fine as it should. If I use a piece of wire or or any other conductor ie a coin, nothing happens. I don't intend poking it with wire or anything else but would like some one to explain please out of curiosity more than any other reason.

  Chronos the 2nd 14 Mar 13

Any use, How Stuff Works. Not a definitive answer I admit but perhaps it has to do with the size of the conductor?

  bumpkin 14 Mar 13

Chronos, thanks for the link. these screens are far more complex than I thought, clever stuff. Having played around with some other bits I am of the opinion that is something to do with the size of the contact area with the screen as you suggested. Too large is as bad as too small it seems.

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