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Smart Watch with Optical Fingerprint Solutions

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Fingerprint authentication has been widely implemented for security in data access, payment, and entrance.  A new trend in wearable devices, such as smart watches and bracelets, utilize fingerprint simple and reliable authentication features.  For these highly secure applications, CMOS Sensor Inc’s optical fingerprint sensor is an ideal solution. It is capable of scanning fingerprints through thick cover glass (2.5D glass or thicker) with high resolution and high performance, making it possible for the industry to achieve clean under-glass, in-display and water-proof designs.               

For the new generation smart watches, OLED has been vastly used due to its great clarity, appearance, and quality. The in-display (or under-display) is also required for its easy and simple touch.As such, the capacitance fingerprint is no longer a suitable solution, instead, the optical fingerprint sensor has become the optimal solution for the capability of deep penetration through thick glass and OLED. CMOS Sensor Inc’s optical fingerprint sensor offers a perfect solutionwith high precision and durability.

Key Features (Sensor):


  • Support 1.8mm-thickness panel + Coverglass

  • Ultra thin / under-display / OLED

  • Ultra-low active power consumption Ivdd = 5 mA (typical)

  • Sleep mode for power saving ~ 1 µA (typical)

  • Sensing area: 4 mm x 6 mm

―1016 dpi: 25 x 25 µm pixel; 160 x 240 array

  • 256 grayscale (8 bits) values in each pixel

  • Conversion gain: 32 uV/e

  • High speed SPI bus compatible serial interface

  • Exposure time control with configurable LED_ON width

  • Core Voltage VDD = 3.3 V

  • Interface control VDDio = 1.8~ 3.3 V

In-Display Optical Fingerprint
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Functional Block Diagrams
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Applications for Fingerprint recognition

◆ Direct digital payment/wallet

◆ Fingerprint-secured payment (Code-less)

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◆ Payment QR codeafter authentication

◆ Smartwatches with optical fingerprint will be a trend for its simple, efficient and quick security authentication.

◆ Besides contactless payment, it can be used as:

  • Transit/entry pay --- transportation, parking, sports/games, theaters, fare gates ..

  • Access keys ---your car, home, workplace, and hotel room …etc

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