Multi-Layer Adhesive Member for Fingerprint Sensor Attachment
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Solution Overview
Problem
Existing electronic devices with fingerprint sensing modules face challenges in securely attaching the sensing module to the display module while maintaining effective adhesive force and minimizing deformation, which affects the sensitivity and stability of fingerprint sensing.
Innovation Solution
An electronic device design featuring a multi-layered adhesive member with a base layer, a first adhesive layer, and a second adhesive layer, where the second adhesive layer includes a photoinitiator activated by ultraviolet light, is used to securely attach the sensing module to the display module, enhancing the adhesive force and stability between the modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single-layer adhesive member is used to attach the sensing module to the display module, then the device structure is simple, but the adhesive force is insufficient and deformation occurs affecting sensing sensitivity
Solution Approach 1:
The adhesive member is divided into multiple layers: a first adhesive layer attached to the display module, a second adhesive layer attached to the sensing module, and an intermediate base layer connecting them. This segmentation allows each layer to perform specific functions, achieving sufficient adhesive force while maintaining structural integrity and minimizing deformation that would affect sensing sensitivity.
2Reliability
If the adhesive force between the sensing module and display module is increased, then the attachment stability is improved, but the deformation of the sensing module increases affecting sensing accuracy
Solution Approach 1:
The adhesive member is designed with different local properties: the first and second adhesive layers provide high adhesive force for secure attachment, while the intermediate base layer has appropriate mechanical properties (modulus 150 MPa to 10 GPa) that allow it to absorb stress and minimize deformation transmission to the sensing module, thus maintaining sensing accuracy while ensuring attachment stability.
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
The enhanced adhesive force and stability improve the sensitivity and reliability of fingerprint sensing by minimizing deformation and ensuring a secure attachment of the sensing module to the display module, thereby improving the overall performance of the fingerprint sensing function.
Implementation Method 1
the second adhesive layer includes a photoinitiator activated by ultraviolet light
Data Source
AI summary
An electronic device includes: a display module; a first adhesive member having a multi-layered structure and having a first adhesive surface attached on a back surface of the display module; and a sensing module including a sensing area, the sensing area being attached on a second adhesive surface facing the first adhesive surface of the first adhesive member.