How does projected capactivie touchscreen work ?
The projected capacitive touch screen works on the principle of conventional capacitive touch screens with the addition of two sensing arrays (X and Y as shown in Figure 6) on two different layers that are perpendicular to each other along with a drive line. As X and Y arrays exist on different layers, the point where the two intercept becomes a capacitive node. When electrical currents run along one of the arrays through the drive line, the other array and the circuitry that detects change in capacitive values becomes connected. During actual operation, the controller sends electrical currents to the drive lines on different layers to create a specific electrical field with the nodes.
Since human body is a conductive organ, When the user places his finger or uses a touch medium to the touch screen, coupled capacitor is thus formed, the controller immediately picks up the change in capacitive value between the nodes and drive lines to pinpoint the exact location of the touch event.
Now we know what’s the projective capacitive touchscreen ? However, we need to dig deep to learn more about the structure and function process of every component that makes up of capacitive touchscreen.