Smartphone features under glass fingerprint sensor

3rd May 2016

LG Electronics

Jordan Mulcare

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LG Innotek has announced an under glass fingerprint sensor module, which allows you to simply place your finger on the cover glass of the phone, in which it identifies your fingerprint. This module gives the freedom of the smartphone design and even enhances the user-friendly function, for example, waterproof or protection from scratches.

Previous ‘button type’ modules required you to press a finger on a raised square or circular button for your fingerprint to be read exactly, so the sensor was usually mounted on the front, rear or side buttons of a smartphone. LG Innotek cut a shallow furrow of 0.01" thick on the lower backside of the cover glass and installed the fingerprint sensor inside of it with using their supreme precision and combination technology.

With this module, the sensor is not exposed to the outside of the device, so manufacturer can produce a sleek designed smartphone. Fingerprint recognition area also can be indicated by various patterns up to design of complete product. High-strength cover glass protects the sensor and prevents it from coming in direct contact with water or damage from scratches.

At the same time, the new module secured the fingerprint recognition accuracy compared to the button type. The new module has a false acceptance rate (FAR) of 0.002%. The FAR is the probability that the system falsely recognises someone else's biometric information as that of the user.

LG Innotek developed a proprietary adhesive to be used to attach the sensor to the glass, securing the commercialization scale of the durability including high impact absorption. The adherend side of the sensor and glass is only 0.0098" thick, but it en-dures impact of 4.6oz of the steel ball dropped from 7.9".

LG Innotek expects that demand for fingerprint recognition technology will dramatically in-crease due to the expansion of the mobile payment market, has a plan to secure the new customer. Market research firm, IHS, reports approximately 499m fingerprint sensors have been sold globally in 2015 and expects that number will increase to 1600m units in 2020.

Changhwan Kim, Head of the company’s R&D Centre said, "We are concentrating on all our resources to the development of the differentiated technology based on the creation of cus-tomer values.” “We will continue to provide convenient, safe, and pleasant user experiences by launching innovative product.”