Fingerprint sensor applications mature

Fingerprint unlocking computers are available in many electronic products. Today this feature is also used in many office environments. With the continuous advancement of the miniaturization of fingerprint sensors, more areas have begun to adopt this functional device.

The fingerprint sensor (also known as the fingerprint sensor) is a key device for realizing automatic fingerprint collection. Fingerprint sensors according to the principle of sensing, that is fingerprint imaging principles and technologies, divided into optical fingerprint sensors, semiconductor capacitance sensors, semiconductor thermal sensors, semiconductor pressure sensors, ultrasonic sensors and RF RF sensors. The manufacturing technology of fingerprint sensor is a high-tech with high comprehensiveness, high technical complexity and difficult manufacturing process.

The semiconductor fingerprint sensor has complicated manufacturing processes and many sensing units per unit area, including high-end IC design technology, large-scale integrated circuit manufacturing technology, IC chip packaging technology, etc. Therefore, the semiconductor fingerprint sensor is almost entirely developed by IC technology countries or countries. Regional, such as the United States, Europe, Taiwan and other places designed and manufactured. More than 10,000 semiconductor sensing units are integrated on the surface of a wafer less than 0.5 square centimeters. It also includes automatic gain circuits and logic control chips, as well as serial, parallel, USB, and other interface circuits. At present, the sensitivity of the semiconductor fingerprint sensor is high, and the resolution also reaches 500 dpi or more. Its function has already broken through the single sensory ability, plus the software cooperates, can use as the omnidirectional navigator.

Although fingerprint recognition technology has matured, image processing and pattern recognition technology has been well resolved, but in fact, as the core technology of fingerprint recognition, there are still many unsolved problems, especially the identification of incomplete and dirty fingerprint images. The robustness and adaptability are unsatisfactory. The fingerprint identification system will further broaden its application with the advent of smaller and cheaper fingerprint input devices, more computationally intensive and cheaper hardware, and the widespread use of the Internet. The application algorithms that can adapt to the online online automatic fingerprint identification system need to be further improved. The integrated application of multiple fingerprint identification methods and the integrated application including fingerprints that are multiple biometric identifications will also be the direction of future research and development. The research on fingerprint identification in foreign countries has a trend of warming up. Therefore, it is still an important and challenging model recognition research topic in the next few years.

InvasiveCode's biometrics expert Geppy Parziale posted on the website an in-depth explanation of fingerprinting and explained why fingerprinting technology is a reliable authentication solution. The most important thing in fingerprint recognition technology is the sensor. The quality of recognition depends on the quality of the fingerprint image captured by the sensor. The less noise, the higher the quality. The core technology of the production sensor can cause noise and errors in the captured fingerprint photos and affect the recognition effect. Such a situation may result in the correct fingerprint being not recognized, or the wrong fingerprint being recognized. Both cases are very serious.

Parziale also shared his concerns about sensors, especially the problem of service life. In daily life, the situation is very complicated. Users usually use their hands to perform various tasks and contact with different items. The material above these materials will accumulate on the skin of the fingers, and when you touch the fingerprint sensor, these substances will adhere to the sensor. In addition, sweat and oil from the skin can also affect the sensor.

Various substances, sweat and grease will reduce the life of the sensor. We also need to consider that the user will place the iPhone in various places, such as "dirty" pockets, on different surfaces, in a wet, overheated, cold or overdry environment. These factors will accelerate the decay process of the sensor. Of course, the performance of the sensor may vary depending on Apple's level of expertise in hardware.