LG Innotek unveils innovative fingerprint sensor module without button

LG Innotek's new fingerprint sensor module

LG Innotek , part of the Korean consumer electronics corporation LG, has introduced an under glass fingerprint sensor module. By placing the finger on the cover glass of the phone, it identifies the fingerprint. This module provides the freedom of a smartphone design and even enhances the function, for example, by being waterproof or offering protection from scratches.

Previous ‘button type’ modules required the pressing of the finger on a raised square or circular button for the 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 0.01inches (0.3mm) thick on the lower backside of the cover glass and installed the fingerprint sensor inside of it with using their precision and combination technology. With this module, the sensor is not exposed to the outside of the device, so the manufacturer can produce a sleek designed smartphone. The fingerprint recognition area can also be indicated by various patterns up to the 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 is reported to secure 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 commercialisation scale of the durability including high impact absorption.

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