The technical indicators of the capacitive touch screen are as follows:
Accuracy: 99% accuracy.
Material: Completely scratch-resistant glass material (Mohs hardness 7H), not easily scratched and worn by sharp objects, and not affected by common pollution sources such as water, fire, radiation, static electricity, dust or oil. It also has the eye protection function of goggles.
Sensitivity: Less than two ounces of force can be sensed, and a quick response of less than 3ms.
Clarity: Three surface treatments (Polish, Etch, Industrial) are available. The MTBF of the SMT controller is greater than 572,600 hours (per MILHANDBOOK-217-F1).
Touch life: any point can withstand more than 50 million touches, and the cursor will not drift after one calibration.
Capacitive touch technology is a touch technology that utilizes changes in capacitance generated when a finger approaches the capacitive touch panel. Capacitive touch has two important capacitance parameters. One is the sensing capacitance between the finger and the upper sensing material (such as ITO), and the other is between the sensing material (such as the upper and lower layers of ITO) or between the sensing material and the optical panel. The parasitic capacitance between (such as ITO and LCD).
Parasitic capacitance will be generated between the conductors, and when the finger conductor approaches the sensing conductors of different voltages, the induced capacitance changes will also occur. The capacitance sensing effect is how to detect a small change in sensing capacitance of 0.1 to 2 pF units under a larger parasitic capacitance value (30 pico Farad; pF). Capacitive touch technology is relatively stable and highly reliable. With the characteristic that the human body is a capacitive body, the capacitance change generated when touching the touch panel achieves the sensing touch effect.Christopher Ard, director of marketing at Atmel, pointed out that the sensor design can be a single-sided ITO pattern for the lowest functional interface, such as a single touch point for large virtual buttons, sliders and other applications, but the more common implementation is a two-layer design (separate X and Y layers), which requires more complex performance and accuracy.
