Projected Capacitive touch screen
Traditional touch screen interfaces, such as Resistive, Capacitive and Surface Acoustic Wave are surface activated. Surface activated means the user’s input needs to make physical contact with the touch interface for it to work.
Projected Capacitive (PCT) touch screens do not require physical contact to operate. PCT touch screens are made up of a thin film, covered in a grid of micro-fine sensing wires. A low voltage current is applied to the sensing wires, creating a uniform electro static field.
This electrostatic field is sensitive to conductive objects, such as a finger. When a conductive object is near the electrostatic field, a distortion is generated. Sensors can calculate the location of the electrostatic distortion by measuring the capacitance in each of the sensing wires.
Because PCT touch screens do not require physical contact to receive an input, they can be mounted behind a protective sheet of glass or clear plastic. Protecting the touch interface in such a manor ensures a longer life-time and protects it from accidental and malicious damage. PCT touch screens have an unlimited touch life span, are drift free and require minimal maintenance. With such clear advantages, PCT touch screens are an ideal technology for use in outdoor kiosks, ATM machines and applications that are used by the general public.
Excellent calibration stability
High level of display clarity and light transmission
Can detect a bare finger, gloved finger and stylus input
Can be mounted behind a protective sheet of glass or clear plastic
Unlimited touch life span and requires minimal maintenance
Markets and applications
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