Advantages and disadvantages of optical fingerprint module

Release time:2024-08-01 17:21:04

The optical fingerprint module mainly utilizes the principles of light refraction and reflection. By placing the finger on an optical lens, the finger is illuminated by a built-in light source. The light is directed from the bottom towards a prism and then emitted through the prism. The angle at which the emitted light refracts on the uneven lines of the fingerprint on the surface of the finger and the brightness of the reflected light will be different. Project it onto a charge coupled device (CMOS) or CCD using a prism to form a digitized multi gray fingerprint image with ridges (ridges with a certain width and direction in the fingerprint image) in black and valleys (depressions between ridges) in white, which can be processed by fingerprint device algorithms.

Advantages and disadvantages of optical fingerprint heads

Optical fingerprint moduleThe advantages mainly include long-term practical testing, good system stability, low cost, and the ability to provide images with a resolution of 500 dpi (dot per inch). Especially capable of capturing fingerprint images over a large area, effectively overcoming the expensive disadvantage of large-area semiconductor fingerprint sensors. The limitations of this sensor mainly lie in the potential fingerprints, which not only reduce the quality of fingerprint images, but in severe cases, may also cause two fingerprints to overlap, making it difficult to meet practical application needs. In addition, the coating on the table and the CCD array may experience wear and tear over time, which may lead to a decrease in the quality of the collected fingerprint images. With the development of optical technology, some novel techniques have also been applied to the acquisition of fingerprint images, which can significantly reduce the volume of optical fingerprint modules.

Application of Optical Fingerprint Head

The advantages of optical fingerprint modules mainly include strong anti-static ability, good system stability, long service life, particularly high sensitivity, and the ability to provide high-resolution fingerprint images. The technology is also the most mature. So now many companies are using it extensively, mainly for fingerprint door locks, safes, and car fingerprint anti-theft.

Product images

Eddie Ward Company has 20 years of profound accumulation in the field of fingerprints, including optical fingerprint modulesCapacitive fingerprint moduleFingerprint module supplier. The product is based on the IDFinger fingerprint algorithm, high-performance processor, and fingerprint sensor, and 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.