How Does It Work
This through non-conductive material capacitive touch sensing technology works using an electrical phenomenon called Projected Capacitance. When two electrically charged objects come near to one another without touching, their electric fields interact to form capacitance. In the case of the ViP Interactive foil projected capacitance forms between the user’s finger and the wires in the sensor grid. This “touch event” is detected, precisely measured, and passed on to the system for processing.
To better understand how this touch sensing technology works, let’s examine the construction of the capacitive used in the ViP Interactive foil:
* Insulating surface: A thin layer of clear polyester that protects the underlying sensor wires.
* Laminated sensor grid: The wires that form the sensor grid are made from copper and run horizontally and vertically through the sensor. To reduce the visibility of the grid, the wires are specially designed to tile the entire surface yet minimally overlap at the crossings. Each wire is a sensing element that connects to the touch controller chip. These wires sense and detect the user’s finger; information about x and y coordinates and this information is passed to the touch controller chip.
* Bottom substrate: Another thin layer of clear polyester that separates the sensor grid from the underlying surface to which it is applied.
When the user interacts with the ViP Interactive foil the following processes occur: