Fingerprint Sensor Button Structure for Compact Biometric Integration
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Solution Overview
Problem
The integration of fingerprint sensors into portable electronic devices poses challenges due to size constraints and the need for durability, as existing solutions require separate apparatus and are not practical for minimal form factor devices, limiting the adoption of fingerprint-based authentication methods.
Innovation Solution
A biometric sensor integrated into a multi-layer laminate package with signal traces and connection vias, encapsulated in moldable plastic with rounded edges, capable of functioning as both a fingerprint sensor and a mechanical switch, allowing for compact and durable integration within electronic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate fingerprint sensor apparatus is used, then fingerprint sensing capability is achieved, but device size and complexity increase
Solution Approach 1:
The patent combines the fingerprint sensor with an existing button structure, integrating biometric sensing capability into a component that already serves mechanical input functions. This merging eliminates the need for a separate fingerprint sensor apparatus, thereby reducing device size and complexity while maintaining reliable fingerprint sensing capability.
Solution Approach 2:
The button structure is designed to serve multiple functions: it acts as both a mechanical input device and a fingerprint sensor. By making the button universal for both purposes, the patent avoids adding extra components, thus reducing overall device complexity and size while achieving reliable fingerprint authentication.
2Device complexity
If fingerprint sensor is integrated into button, then device size is reduced, but durability under stress decreases
Solution Approach 1:
The patent incorporates a cushioning layer between the fingerprint sensor and the button structure to absorb and distribute mechanical stress before it reaches the sensitive sensor components. This beforehand cushioning protects the integrated sensor from damage during drop testing and actual use, maintaining durability while preserving the compact integrated design.
Solution Approach 2:
The patent uses composite material structures combining different materials with complementary properties - a rigid button exterior for durability, a flexible cushioning layer for shock absorption, and a sensitive sensor layer for fingerprint detection. This composite approach maintains both the compact size and the durability required for withstanding stress.
3Length of moving object
If minimal form factor is used, then portability is improved, but integration of authentication functionality becomes impractical
Solution Approach 1:
The patent nests the fingerprint sensor within the button structure, placing one component inside another. The sensor is positioned within the button's internal volume, allowing the authentication functionality to be integrated into the minimal form factor without requiring additional external space, thus maintaining portability while enabling manufacturing integration.
Data Source
AI summary
A biometric sensor may comprise a plurality of a first type of signal traces formed on a first surface of a first layer of a multi-layer laminate package; at least one trace of a second type, formed on a second surface of the first layer or on a first surface of a second layer of the multi-layer laminate package; and connection vias in at least the first layer electrically connecting the signal traces of the first type or the signal traces of the second type to respective circuitry of the respective first or second type contained in an integrated circuit physically and electrically connected to one of the first layer, the second layer or a third layer of the multi-layer laminate package.