High-sensitivity capacitive pens operate by sensing the electrical current from the human body. Among them, the capacitive pen coil is made of conductive material and works by mimicking the body’s bioelectric current to interact with the touchscreen. Low-cost capacitive pens available in the market are generally less sensitive during the touch process compared to smartphones, resulting in larger strokes and the absence of signal transmission. However, capacitive pens with coils can alter the capacitance of the touchscreen matrix, significantly increasing the sensitivity of capacitive pen operations.

Capacitive pen coils can be classified into passive capacitive pen coils and active capacitive pen coils:

Passive Capacitive Pen Coils: Made using the principle of physical conduction, they do not emit signals but can change the capacitance of the touchscreen matrix upon contact. By modifying this capacitance, they can operate mobile phones. Essentially, they mimic the finger touch and can be considered as lacking anti-misoperation features. Therefore, active capacitive pens are currently widely acknowledged.

Active Capacitive Pen Coils: They simulate finger touch through an electromagnetic field. The capacitive pen coil actively detects signals from the capacitive screen, providing a response. Its pen tip can be very fine, similar to a oscilloscope probe, coupling the signal to the internal processing unit of the pen. Compared to passive capacitive pens, active capacitive pens can achieve more precise operations. However, in reality, the screen terminal does not recognize that you are using a capacitive pen but rather interprets it as a finger with a higher level of precision.

Capacitive pen coils are developed based on capacitive touchscreens, requiring minimal additional costs to enable handwriting functionality. Capacitive pen coil touch pen solutions have a pen tip diameter of 1mm, with a touch accuracy of ±0.3mm, fully meeting current writing requirements. Capacitive pen coils allow simultaneous touch by finger and pen without any mutual interference, providing great convenience to applications.