Projected Capacitive Touch Screen



Projected Capacitive Touch screen

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.

Product Advantages

  • Honeycomb structure;
  • Independent signal output;
  • Realizes multitouch capabilities;
  • Touch screens can be built in specific dimensions requested by clients in custom orders;
Item Standard
Size Range 7-21.5inch
Input Mode Finger, Gloved hand activation
Operating Temperature 0℃~60℃
Storage Temperature -10℃~70℃
Transparency >90%
Linearity 1.5%
Structure Glass/Glass
Hardness >7H
Operating Force <10g
Loop Resistance 500-1000 ohm
Knock Test 350,000,000 times
















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