Foldable FPCB Hinge Guidance for Asymmetry and Wear Control
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Solution Overview
Problem
Flexible printed circuit boards (FPCBs) in foldable electronic devices suffer from deformation and damage due to repeated folding and unfolding, leading to a shortened lifespan and asymmetrical shapes, which can be exacerbated by friction with housings and components.
Innovation Solution
A foldable electronic device design incorporating a flexible printed circuit board (FPCB) with a hinge structure and a guide protrusion, along with a reinforcement portion that guides the FPCB's movement to prevent asymmetrical shapes and protect it from damage during folding and unfolding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the FPCB is freely bent to accommodate folding movements, then the device achieves foldability and portability, but the FPCB deforms asymmetrically and its lifespan shortens due to repeated folding
Solution Approach 1:
The FPCB is divided into distinct functional segments: a flexible portion for bending movements and a reinforcement portion with guide protrusions for maintaining shape. This segmentation allows each part to perform its specific function optimally while working together to solve the contradiction between foldability and durability.
Solution Approach 2:
The reinforcement portion acts as an intermediary structure between the flexible FPCB and the hinge housing. It mediates the interaction by providing guide protrusions that constrain the FPCB's movement path, preventing asymmetric deformation while allowing necessary folding movements.
2Ease of operation
If the FPCB moves freely during folding, then the device achieves smooth folding operation, but friction with housing and components causes damage and asymmetrical shapes
Solution Approach 1:
The reinforcement portion with guide protrusions serves as an intermediary that mediates between the FPCB and the hinge housing. It guides the FPCB's movement to follow a predetermined path, reducing harmful friction and contact with other components while maintaining smooth folding operation.
Solution Approach 2:
The guide protrusions on the reinforcement portion enable the FPCB to self-constrain its movement path during folding. The FPCB automatically follows the guide protrusions' trajectory, eliminating the need for external constraints and reducing friction with other device components.
3Reliability
If the FPCB is reinforced to prevent deformation, then the FPCB maintains its shape and lifespan, but the structure becomes more complex
Solution Approach 1:
The reinforcement portion is merged with the FPCB as an integrated component rather than a separate attachment. This combining approach provides shape stability and guidance functionality while minimizing additional structural complexity and assembly steps.
Solution Approach 2:
The reinforcement portion performs multiple functions simultaneously: it reinforces the FPCB to prevent deformation, provides guide protrusions for movement constraint, and maintains electrical connection integrity. This multi-functionality reduces the need for additional separate components.
Data Source
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AI summary
According to an embodiment of the disclosure, a foldable electronic device may comprise a flexible printed circuit board (FPCB), a hinge structure connecting a first housing and a second housing, a hinge housing receiving at least a portion of the hinge structure and the FPCB and including a guide protrusion protruding upward from an inner surface, and a reinforcement portion coupled to the FPCB and including a guide portion for guiding a vertical movement of the FPCB along the guide protrusion in response to a movement of the first housing and the second housing.