In the Network, a lot of rumors about the built-in display of the new iPhone 8 the fingerprint scanner. However, few leaks pay attention to how will be implemented this technology.
Anniversary the flagship of the Apple move to OLED displays, which will be reflected not only on time of Autonomous operation of the smartphone, but the Touch ID sensor.
In models with iPhone 5s for iPhone 7-applied technology, developed by AuthenTec, which Apple acquired in 2012. AuthenTec worked with biometric security systems and it technology are used in Apple devices.
iPhone activate fingerprint sensor as soon as the finger appears in the detector ring. The delicate sensor is protected a sapphire crystal and uses a capacitive CMOS sensor for scanning of the fingertip with a resolution of 500 ppi. The obtained fingerprint is compared with the data stored in the Security Enclave. If they match, the mobile rasplachivaetsya.
The problem with the iPhone 8 is that the biometric module must be embedded in a display panel. The sensor module has a thickness of 170 microns, and the sapphire crystal a little thicker. One of the advantages of OLED-panels of a small thickness relative to the LCD. But despite this, it is more than 5 times thicker in comparison with sapphire coating.
With increasing distance between the contact surface and the sensing matrix, there is a blurring of the electric field of a finger, fixed Touch ID. In the current implementation, the coating is thin enough to achieve the minimum distortion. If the same fingerprint scanner placed under the screen glass of the iPhone 8, the recognition accuracy will fall sharply.
If Apple compensates for this software and will increase the possible deviation of the scanned fingerprint from what is stored in the device memory, it can lead to security issues.
Previously, Apple has registered a patent for a touch sensor that uses multiple electrostatic lenses. Through these lenses, the electric field from the user’s finger can be transmitted to the sensor embedded in the glass with virtually no distortion. Even a slight difference in microns may adversely affect the recognition accuracy and security, so implementing this technology would require a lot of time and effort.
According to rumors, the integration of a fingerprint scanner in the iPhone display 8 can be a reason for the delay of the release of the smartphone. Some analysts believe that Touch ID can be moved to the rear panel of the device, if Apple does not manage to solve the problem.