Fingerprint Sensor Integration in Electronic Device Housings
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Solution Overview
Problem
Fingerprint sensing technology faces challenges in integration with minimal size or weight devices due to the need for separate apparatus and significant design modifications for silicon circuits, making it impractical for compact systems.
Innovation Solution
An electronic device housing with a fingerprint sensor region integrated within the housing, positioned near the surface for sensing, and an integrated circuit for communication, allowing for capacitive image sensing and other sensing capabilities without requiring additional surface protrusions or significant design changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate and distinct apparatus is used for capturing fingerprint images, then fingerprint sensing capability is achieved, but device size and complexity increase
Solution Approach 1:
The patent merges the fingerprint sensor with the display assembly by integrating the sensor into the display structure. The sensor is positioned behind the display screen, allowing the display assembly to serve dual purposes: visual output and fingerprint capture, thereby eliminating the need for a separate fingerprint sensing apparatus and reducing overall device volume.
Solution Approach 2:
The display assembly is designed to perform multiple functions: it serves as both the visual display interface and the fingerprint sensing component. By making the display assembly universal for both purposes, the patent eliminates redundant components and reduces device complexity and size.
2Reliability
If silicon circuits are incorporated into device surfaces for fingerprint sensing, then sensing capability is achieved, but design and production processes require significant and costly modifications
Solution Approach 1:
The patent uses a capacitive sensing approach that creates an electrical model or copy of the fingerprint pattern through capacitance measurements. This allows fingerprint sensing without requiring complex silicon circuit integration into the device surface, as the sensing can be achieved through simpler capacitive elements that are easier to manufacture.
Solution Approach 2:
The patent replaces complex silicon circuit-based sensing mechanisms with capacitive sensing elements. This substitution simplifies the manufacturing process by eliminating the need for intricate silicon circuit integration into device surfaces, while still achieving reliable fingerprint sensing capability.
3Measurement precision
If the sensing component is positioned close to the exterior surface, then sensing effectiveness is improved, but structural integrity and protection of the sensor are compromised
Solution Approach 1:
The patent nests the fingerprint sensor within the display assembly structure. The sensor is positioned close to the exterior surface for effective sensing, but is protected by being nested within the layered structure of the display assembly, which includes protective layers such as the display screen and adhesive layers that shield the sensor while allowing capacitive sensing to function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the integration of fingerprint sensing technology into compact devices by providing a molded housing with a fingerprint sensor region and integrated circuit, enhancing adoption and usability in minimal form factor devices while maintaining operational effectiveness.
Implementation Method 1
capacitive image sensor inserted near or at the surface on which sensing can be performed
Data Source
AI summary
Electronic devices are described which are adapted and configured to incorporate a fingerprint sensor within a recess or aperture, formed or molded in the housing, such that the fingerprint sensor interface is within 500 microns of an exterior surface of the device. Methods of use and manufacture are also described.