Multi touch is unlikely to be alien to you; every pinch, swipe, tap, long press and flick on a touch screen is essentially a multi touch gesture.
It’s not only touch screens that display this behavior; many laptop track pads support multi touch.
The technology has seen several types of implementations since the 60’s. In its most advanced implementation, multi touch becomes multi user in video walls and tabletops that let multiple users interact with the same device.
The most common usage of multi touch is in capacitive touch screens, as seen on smartphones and tablets.
Different types of multi touch technologies
Multi touch technology can be divided into two main types:
The software stack is also important for detecting multi touch. The process of converting an input on the screen to a multi touch gesture has a number of stages:
In the case of Baanto’s ShadowSense touch screen technology, shadows cast by an object on to sensors embedded in the bezel are used to detect multi touch gestures on our touch screen panels.
Up to 10 touch points are supported, as well as natural gestures like flicks, swipes and pinches. ShadowSense delivers stable and repeatable performance with no ghosting and or lost touch points.
One unique feature of ShadowSense touch screens is that their performance remains fluid even as the number of touch points increases, since the technology works independently of the host CPU.
Implementations of multi touch technologies
Over the years, as multi touch technologies have matured, the implementations have seen multiple form factors. Apart from phones and tablets multi touch screens can be seen in: