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Pressure sensitive technology set to bring 3D capability to touchscreens

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January 31, 2010

The QTC technology detects pressure touch inputs opening up the possibility of 3D interfac...

The QTC technology detects pressure touch inputs opening up the possibility of 3D interfaces and improved handwriting recognition

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Touchscreens found in most mobile devices today use capacitance or resistance technology - fine for detecting input from a finger, but not so great when it comes to detecting how much pressure that finger is applying. However, this limitation could be about to change with news that Japanese touch screen manufacturer, Nissha, has licensed new technology that allows a touchscreen to detect pressure, even from a finger. This adds a third dimension to touchscreen interaction and opens up a raft of potential applications.

The licensing agreement concerns Peratech’s Quantum Tunnelling Composites (QTC) technology, which is used to create ultra-thin, low power force sensitive switches of any shape or size. Adding force sensitivity to touchscreens offers the prospect of adding the third dimension to touchscreen interfaces and could give users the ability to search deeper into a file structure simply by pressing harder, or control an avatar’s movement through a game more naturally. It would also be particularly useful for handwriting recognition in Asian markets due to the variation in line thickness in Asian scripts.

QTC technology's conductive filler particles feature spikes. These spikes produce a localized increase in the electric field at the tips which effectively reduce the barrier’s width and allows conduction to occur.

The spikes on the metal filler particles cause localized high electric fields at their tip...

As QTC is compressed, the conductive particles are brought closer together and barrier widths reduced further. This leads to an exponential decrease in electrical resistance and this ability to vary the width of the barrier through compression, tension or torsion is what gives QTC its pressure sensitivity.

As QTC is compressed the metal filler particles are brought closer together allowing elect...

Its developers say that because QTC technology has no moving parts and requires no air gap between contacts it is extremely reliable and suitable for integration into the thinnest electronic devices. It is also low power and interfaces can be designed with no start resistance so that without pressure, the switch draws no power and passes no current.

The US$1.4 million licensing agreement gives Nissha the exclusive worldwide rights to Peratech’s QTC technology for screen smaller than 3.5 by 5.5-inches for the initial period of one year.

About the Author
Darren Quick Darren's love of technology started in primary school with a Nintendo Game & Watch Donkey Kong (still functioning) and a Commodore VIC 20 computer (not still functioning). In high school he upgraded to a 286 PC, and he's been following Moore's law ever since. This love of technology continued through a number of university courses and crappy jobs until 2008, when his interests found a home at Gizmag.   All articles by Darren Quick
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