4.0-inch 4-button Thin Film Capacitive Touch Sensor
Dr Pan: Welcome to DISPLAY Museum. I am Dr Pan, the curator of Museum.
Greg: Hello, Dr Pan. I am Greg. I came here to learn about thin film capacitive touch sensor.
Dr Pan: Hello, Greg. Thin film capacitive touch sensor is the simplified version of surface capacitive touch screen.
Dr Pan: It is less than 0.3 mm, as thin as a blade.
Dr Pan: From top to bottom, electrode pattern and conductive coating are functional layers, the bottom layer PET is supporting layer.
Dr Pan: There are four electrodes on the four corners for surface capacitive touch screen to detect the location of the touch, therefore there are at least 4 wires.
Dr Pan: Meanwhile, there is only one wire to detect the existence of the contact for the touch sensor.
Dr Pan: We can see that it is practically an induction switch.
Greg: Dr Pan, do you mean only one wire matters no matter how many wires it has?
Dr Pan: Not really. It depends on how many active areas in the touch sensor. Normally, one touch sensor only has one active area, therefore only one wire is needed.
Dr Pan: Check this one and there are three active areas and it needs 3 wires.
Dr Pan: The other three wires are unnecessary and empty.
Dr Pan: We only use the 6-wire FPC to meet the requirements of FPC connector.
Greg: Thank you, Dr Pan. Now I got it.
Dr Pan: Welcome to contact us if you have any question.