Since the beginning of this year, there were rumors that Samsung Galaxy Note 8 and Apple iPhone X would feature in-display fingerprint recognition. However, when both devices were officially released, they did not include this technology. Instead, Samsung placed the fingerprint sensor on the back of the Galaxy Note 8, while Apple removed Touch ID entirely from the iPhone X. The absence of under-screen fingerprint scanning became a major disappointment for users who had hoped for a more seamless and modern design.
Recently, Synaptics announced the launch of the world’s first off-screen fingerprint sensor, the Clear ID FS9500. This groundbreaking technology is directly integrated into the AMOLED display module, using the same optical materials and manufacturing processes as standard OLED screens. The final thickness of the sensor is less than 1.5mm, making it extremely compact and suitable for modern smartphones with full-screen designs.
The FS9500 uses optical technology to support advanced encryption methods such as TLS, AES, and ECC, ensuring secure biometric authentication. According to Synaptics, the sensor has already been provided to one of the top five smartphone manufacturers and is currently in mass production. The upcoming models are expected to be showcased at CES 2018.
One of the key advantages of the Clear ID design is that it eliminates the need for a physical fingerprint button, allowing for a truly full-screen experience. When activated, the FS9500 uses the backlight from the OLED panel to illuminate the finger area and then captures the reflected light to create a detailed image of the fingerprint. This process is both fast and accurate, offering users a convenient and secure way to unlock their devices.
Synaptics also emphasized that the sensor is more durable and resistant to moisture, dirt, and wear compared to traditional external fingerprint buttons. Additionally, the company’s SentryPoint Security and Anti-Spoofing Suite ensures that only real fingerprints can be recognized, protecting user data from fraud and unauthorized access.
The Clear ID FS9500 family is designed to adaptively improve fingerprint recognition over time, continuously learning and enhancing its ability to distinguish genuine fingerprints from fake ones. This makes it an ideal solution for future smartphones that aim to offer both security and convenience.
While Synaptics hasn’t revealed specific design plans yet, they mentioned that an in-house production demonstration will be available by the time the first device featuring the technology is launched at CES 2018.
So, what makes under-screen fingerprint recognition so challenging? From a technical standpoint, there are four common methods: optical, capacitive, thermal, and ultrasonic. Most consumer electronics companies prefer capacitive sensors due to their compact size and cost-effectiveness. These sensors, usually located under the home button or on the back of the device, capture detailed surface texture data and store it securely.
To unlock a device, users typically need to place their finger on the sensor 8–12 times. Today’s capacitive sensors offer near-instantaneous recognition, taking just 0.15–0.2 seconds to verify a fingerprint. They are also equipped with in vivo detection features that can identify temperature changes, helping to prevent fake fingerprints from being used.
However, capacitive sensors struggle with under-screen recognition because the screen itself can block or weaken the signals. That’s why optical and ultrasonic solutions are often considered more suitable for in-display fingerprint technology, as they have better penetration capabilities.
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