Triggering a touch screen with a microcontroller

[mribble]

Nearly all touch screens on phones are capacitive touch.  These screens detect touch by a change in capacitance.

There are several examples online of people taping a wire to the screen and then switching a relay to simulate a touch.

I've verified a relay works.  However, I was hoping I could switch to using a transistor or ideally just an IO line.  I tried a quick test with Arduino by switching an IO line between high impedance and 0V.  This didn't work.  I suspect it's because of the parasitic capacitances you find in integrated circuits.

I'm wondering if you guys know of a solid state device/transistor that has exceptionally low capacitance between the source/drain that I could try?

[mribble]

Basically what I'm looking for is some kind of really low capacitance switch that acts more like a relay than a mosfet.

I've never used anything like this, but maybe something like this would work? http://www.ti.com/general/docs/suppproductinfo.tsp?distId=26&gotoUrl=http%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fts5a3166-q1

Thanks in advance for any suggestions you guys have!