Pro-CAP Touch Sensor Structure :
Work Principle:
The projected capacitive touch screen works on the principle of conventional capacitive touch screens with the addition of two sensing arrays (X and Y) 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.
When the user places his finger or uses a touch medium close to the touch screen, 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. Since the sensing arrays on the panel form a 3D electrical field that is independent to the surface capacitors, the touch event registers even when no physical contact with the touch screen is made. In other words, projected capacitive touch screens feature Z-axis recognition.
l The different and Advantages
Housing,V/A,A/A Design
The recommendation of the relative position design for housing,Touch Panel and LCD
The New transparent capa. TP is for Handset device application. Conventional capa. TP subtract is PCB and only for fixed touch icon design .The New capa. TP is embedded in transparent ITO glass which transmittance is over 90% and provide flexible and abundant icon design when combined with LCD ,such as key pad, scroll bar, slider and etc. changeable touch icon .
Comparison with resistive TP
Item |
Resistive T/P |
Capacitive T/P |
Input Media |
Stylus, Finger |
Finger |
Lifetime of single point |
Acceptable |
> 100 million |
Life time |
Acceptable |
Excellent |
Environmental durability |
Poor |
Good |
Transparency |
Low (<83%) |
High (>90%) |
Patent |
No patent limitations |
Some patent issues |
Characteristic comparison between resistive and capa. TP
Comparison with conventional capa.TP
The difference between new PCAP and conventional TP
