PROJECTED CAPACITIVE TOUCH (AKA PCT & PCAP) TECHNOLOGY

Projected Capacitive Touch (PCT) technology uses an insulator like glass coated with a transparent conductor such as ITO (indium tin oxide). When a user touches the screen, it distorts the screen's electrostatic field, leading to a measurable change in capacitance.

In simple terms, PCT senses touch by interacting with electrical fields, with touch altering the circuit's capacitance.

Different methods can be used to determine the touch location, which is then sent to the controller for processing. The process involves reading output from sensing points, analyzing touch data, comparing it to past data for action, filtering raw data, generating gradient data, and calculating boundaries and coordinates for multipoint tracking.

Projected Capacitive Touch (PCT) Screen Construction

A capacitive touchscreen sensor consists of a large array of indium tin oxide (ITO) conductors on one or more layers of glass or polyethylene terephthalate (PET) plastic. The good optical clarity and low resistivity of ITO make it the overwhelming choice for this very sensitive circuit.

Projected Capacitive Touch (PCT) Screen Layers

Atop the display screen, but before the touch sensor is added, falls an insulating material to avoid interference from capacitive noise. Particularly if a metal bezel is used, an additional insulator is needed for the same reason.

Customized Multiple Color Cover Glass From AIS

You are no longer limited to black-and-white printing on glass: here at AIS, we can take your custom orders for Projected Capacitive Multi Touch Displays, with color and logos printed right on the glass.