USB Windows Biometric Fingerprint Reader for Registration

We know that semiconductor sensors, whether capacitive or inductive, have similar principles. On a "flat plate" integrated with thousands of semiconductor devices, the finger on it forms the other side of the capacitance (inductance). Because the finger plane is uneven, the actual distance between the bump and the concave point contacting the flat plate is different, and the capacitance/inductance value formed is also different, According to this principle, the device collects different values...