What is the principle of fingerprint module?
Release time:2024-08-01 17:21:04
What is the principle of fingerprint module?
Introduction to the principle of fingerprint module technology. Fingerprints, due to their lifetime invariance, uniqueness, and convenience, have almost become synonymous with biometric recognition. Fingerprints refer to the uneven lines on the skin at the tip of a person's finger. The regular arrangement of lines forms different patterns. This is the foundation of fingerprint recognition.
The fingerprint recognition module can be classified according to its fingerprint recognition method.
Optical fingerprint module: Identify fingerprints based on the principles of light refraction and reflection.
Capacitive fingerprint moduleCollecting fingerprints through changes in capacitance values.
RF fingerprint module: uses trace RF signals to detect patterns.
Optical fingerprint moduleBy utilizing the principles of refraction and reflection of light, light is directed from the bottom towards a prism and then emitted through the prism. The angle at which the emitted light refracts and the brightness of the reflected light on the uneven lines of the fingerprint on the surface of the finger will be different. CMOS or CCD optical devices will collect image information of different brightness levels to complete fingerprint acquisition.
Semiconductor fingerprint module: Whether capacitive or inductive, its principle is similar, integrating thousands of semiconductor devices in one piece; Tablet” On top of it, the finger is attached to the other side that forms the capacitor (inductor). Due to the unevenness of the finger plane, the actual distance between the convex and concave points and the flat plate is different, resulting in different capacitance\/inductance values. The device summarizes the collected values based on this principle, thus completing the fingerprint collection.
Radio frequency fingerprint module: Using biological radio frequency fingerprint recognition technology, the sensor itself emits a small amount of radio frequency signal, penetrates the skin layer of the finger to control and measure the texture of the inner layer, in order to obtain the best fingerprint image. The anti-counterfeiting fingerprint has strong capabilities, and the principle of radio frequency identification only responds to human genuine skin, fundamentally eliminating the problem of artificial fingerprints.
Product images
Beijing Aidiwade Technology Development Co., Ltd. was established in 2004 and has a deep accumulation of 20 years in the field of fingerprints. The IDWorld series fingerprint module is a stable mass-produced product launched by Ediward. With the IDFinger fingerprint algorithm, high-performance processor, and fingerprint sensor as the core, it has the characteristics of small size, low power consumption, fast acquisition speed, good adaptability to wet and dry fingers, and accurate recognition. Using standard UART\/USB communication, in conjunction with development materials, to meet customer fingerprint recognition needs such as fingerprint input, image processing, template generation, and fingerprint comparison. The IDWorld series fingerprint module supports Windows, Android, and embedded device development.