Wearable Fingerprint Sensor Assembly Waterproofing
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Solution Overview
Problem
Wearable electronic devices face challenges in integrating fingerprint sensors while maintaining water resistance and ensuring a large enough fingerprint measurement area, often requiring additional waterproof structures that complicate design and increase costs.
Innovation Solution
The integration of a fingerprint sensor assembly within a wearable electronic device includes a conductive waterproof film, a printed circuit board, and a reinforcement plate, with an adhesive member and support structure using an anisotropic conductive film for electrical connection, allowing the sensor to extend through an opening in the device's housing, maintaining water resistance and expanding the fingerprint measurement area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a fingerprint sensor is integrated into a wearable electronic device, then the fingerprint measurement area is increased, but water resistance is compromised
Solution Approach 1:
The fingerprint sensor assembly is nested within the housing structure, with the sensor extending through an opening in the housing. The sensor assembly includes multiple nested components: the fingerprint sensor, conductive waterproof film, and printed circuit board arranged in layers within the housing cavity, allowing the measurement area to extend outward while maintaining internal nesting for water protection
Solution Approach 2:
A conductive waterproof film is applied to the fingerprint sensor to provide water resistance. This thin film maintains the sensor's functionality while creating a waterproof barrier, allowing the sensor to extend through the housing opening without compromising water resistance
2Reliability
If additional waterproof structures are added to protect the fingerprint sensor, then water resistance is improved, but device complexity increases
Solution Approach 1:
The waterproof film is integrated directly with the fingerprint sensor assembly, merging the water protection function with the sensor structure. The conductive waterproof film serves dual purposes: maintaining electrical conductivity for sensor operation and providing water resistance, eliminating the need for separate waterproof structures
Solution Approach 2:
The conductive waterproof film performs multiple functions simultaneously: it protects the fingerprint sensor from water, maintains electrical conductivity for sensor operation, and provides structural support for the sensor assembly. This multi-functionality reduces the need for additional components
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
This configuration enhances water resistance and allows for a larger fingerprint sensor area without additional waterproof structures, simplifying design and reducing costs while maintaining effective functionality.
Implementation Method 1
an adhesive member comprising an adhesive disposed on the first area of the first printed circuit board and the reinforcement plate
Implementation Method 2
an epoxy disposed to fill the first hole of the adhesive member and the second hole of the support
Implementation Method 3
a conductive waterproof film attached to one surface of the fingerprint sensor
Data Source
AI summary
An electronic device according to an embodiment of the disclosure may include: a housing including an opening formed through a first surface of the housing, and a fingerprint sensor assembly coupled so that at least a part of the fingerprint sensor assembly is disposed to pass through the opening, wherein the fingerprint sensor assembly includes: a fingerprint sensor, a conductive waterproof film attached to one surface of the fingerprint sensor, and a first printed circuit board at least partially attached to one surface of the conductive waterproof film, the opening includes a first space exposed to the outside of the electronic device and having a first size, and a second space extending from the first space in an inner direction of the electronic device and having a second size smaller than the first size, and the fingerprint sensor assembly is positioned within the first space.