Fingerprint recognition: true/false iPhone6 ​​competition and analysis!
Not long ago, a series of photos of "High Imitation iPhone6" broke out on the Internet. From the appearance, it is difficult for ordinary consumers to distinguish the difference from the real iPhone6 ​​in appearance. And this phone even has Apple's deadly weapon - fingerprint recognition. It is understood that the fingerprint recognition of this mobile phone has adopted the AFS120 chip manufactured by the domestic chip company Mindray Microelectronics, and has achieved mass production. This "domestic fingerprint identification chip" caused a wide range of hot discussions.
Below we will compare / analyze the difference between the two with questions.
Algorithm model
The core advantage of the AFS120 chip is the use of the Pattern Match texture matching method to maximize the use of texture information, making up for the shortcomings of the fingerprint sensor image acquisition area used by smartphones, and keeping the experience and security at the level of traditional applications. This is also the first successful commercial use of this technology in the fingerprint identification industry.
The high level of algorithms significantly increases the sensitivity and effective detection range of the sensor. In particular, even extremely blurred images can be identified, which allows the thickness of the protective medium on the sensor surface to be multiplied, and robust to various types of fingerprints.
Chip package
Unlike the Trench + Wire Bonding-based packaging process from Apple and other manufacturers, Mindray has developed a TSV-based packaging process. The TSV package brings revolutionary advantages to the manufacturability of the fingerprint module, reduces the size of the module, greatly improves the module yield, and is simpler and more suitable for the needs of the mobile phone industry.
Difference with apple
As far as the "differential characteristics" that Apple cares about, Apple's RF-type principle is the quadrature demodulation of reflected waves. The technical route of Mindray is indirect measurement of "CQT" and implemented by switching circuits. Taking the analog power supply and the digital power supply as analogy, the theoretical limit efficiency of the analog power supply is the highest, but it is easy to run away due to process deviation. The theoretical limit of the digital switching power supply is lower, but it is not sensitive to the process deviation, and basically can approach the ultimate efficiency. At the same time, in the DFT design, the design based on the switching circuit is also more advantageous.
This technology is designed for the technical route of large-scale industrial production, and it is also proposed for the first time in the world.
Breaking patent barriers is a technological breakthrough
In the fingerprinting industry, patents are a thorny issue that many vendors must face.
Authentec was the patent overlord of the fingerprint identification industry before it was acquired by Apple. It achieved a devastating acquisition of another rookie Autra in the form of patent litigation, with a purchase price as low as $5 million. In July 2012, Apple acquired Authentec for $356 million, with RF-type full technical barriers and AcTIvity-type major technology patents.
The extension of technology is subjective and ambiguous, so even without clear patent infringement, due to the compatibility of capacitance measurement, there is no guarantee in the patent game rules that companies will not be destroyed like Autra due to malicious patent litigation. Therefore, in addition to the technical methods and Apple, it is better than Apple in terms of technology. Since the basic point of the patent system is to promote technological development, patent courts in any country will not grant newer scope of protection to authorized patents to limit revolutionary technological development. So technological breakthroughs and breaking patent barriers are the same thing.
AFS120 Vs Touch ID
The AFS120 chip has a wafer area comparable to the Touch ID, and the resolution is 508dpi, but the AFS120 has 120x120 sensor points, which is 1.8 times the sensor ID of the Touch ID88x88. The same size of the module size, capturing 1.8 times the fingerprint image, means that the user will bring near square security and a better experience.
The AFS120 module is 0.1mm thinner than the Touch ID. This is the credit of the algorithm. Single crystal alumina is difficult to be thinned to less than 300um, and polycrystalline materials have decisive advantages in processability and mechanical properties. For example, the polycrystalline zirconia used in the AFS120 module has a toughness that is more than 6 times higher than that of single crystal alumina. . The reason why apples use single crystal materials is not only for the sapphire, but because the unevenness of polycrystalline materials can lead to deterioration of fingerprint image quality. Polycrystalline materials can only be applied based on state-of-the-art image processing algorithms, reducing the thickness of the protective cover to 200um, which is 100um savings.
Whether it is 1.2mm for apples or 1.1mm for Mindray, it is the limit under the premise of ensuring mechanical strength. If the thickness is further reduced, the cycle press life will be seriously degraded. However, in actual production, some manufacturers have lost sight of this and reduced the wall thickness of the bottom of the fingerprint module to 100um, but only reduced the thickness of the fingerprint module to less than 1.5mm.
Fingerprint recognition: an academic field worthy of respect
In fact, this time the AFS120 is the second-generation push-type fingerprint sensor of Mindray. As early as 2011, Apple applied for a patent and placed the fingerprint sensor under the glass panel in the lower right corner of the iPhone, so the company's first generation of pressed fingerprint sensors was slightly larger. After the launch of Touch ID, the R&D team immediately reintroduced the design methodology within the technical architecture to develop a small area of ​​ultra-high sensitivity type. The reason why the module is designed to be similar to Touch ID is to pay tribute to Apple and use Apple as a benchmark to demonstrate its technical strength. After the sample module is completed, it happens to have market demand, so it will be mass-produced.
The development of automatic fingerprint recognition technology has been more than 40 years old. This figure is much older than our generation of practitioners and has always been an area worthy of respect in academics. In the past 30 years, the average has risen and fallen in 10 years. Most famous electronic companies in the world have tried and failed. Until Authentec reached the tipping point as the industry leader, Apple's footsteps changed the industry landscape, which opened the outline of large-scale commercialization.
Nowadays, the competition of domestic mobile phones is matched, the competition of cameras, touch screens and CPUs has become fierce. The highest configuration and the latest technology of various models have become the standard of mainstream models. Since the launch of the fingerprint recognition function, the use of electronic payment, cutting the industry application and user demand pain points, has been recognized by the industry, is likely to become one of the keys to the next round of "hardware competition" climax, the patent barrier in this technology And the cost breakthrough will undoubtedly bring greater market competitive advantage to domestic mobile phones.
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