One of the biggest design challenges with resistive touch solutions is getting accurate touch coordinates mapped to the specific underlying display via the touch screen. This is known as “calibration”.
Most resistive touch systems require a calibration step as one of the first steps in integration. Calibration of the touch sensor to the display is necessary because it is next to impossible to perfectly align the touch sensor’s coordinates to the underlying display. “Alignment” is a term used to describe the process of scaling and aligning the sensors’ anomalies to the display
Calibration can address the concern of touch sensor orientation during manufacturing. Consistent performance of the touch sensor is expected across different product platforms. However, many different pin-outs are associated with touch sensors and can be confusing when trying to produce different system platforms that may use touch screens of varying size or possibly even touch screens from different manufacturers. The different pin configurations of sensors can greatly affect the native operation of the touch controller.