Foldable FPCB Layout for Thin and Stable Hinge Assemblies
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Solution Overview
Problem
Foldable electronic devices face challenges in achieving a stable shape change while minimizing thickness and internal space, particularly in managing the arrangement and flexibility of mechanical and electronic components.
Innovation Solution
The implementation of a flexible printed circuit board (FPCB) with a rigid portion and two flexible portions that bend along specific cover portions, coupled with a hinge structure, allows for a stable shape change in a reduced space, accommodating the components efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a flexible printed circuit board with rigid and flexible portions is used, then structural stability is improved, but device complexity increases
Solution Approach 1:
The FPCB is divided into distinct rigid portions and flexible portions, allowing each segment to serve its specific function - rigid portions provide structural support and stable mounting surfaces for components, while flexible portions enable bending and shape changes. This segmentation resolves the contradiction by achieving structural stability where needed without requiring the entire board to be rigid, thus avoiding excessive complexity.
Solution Approach 2:
Different regions of the FPCB are assigned different mechanical properties - rigid portions are designed with higher stiffness for component mounting areas, while flexible portions are designed with lower stiffness for bending areas. This local differentiation of quality allows the board to maintain stability for components while enabling the necessary flexibility for shape change, resolving the contradiction between stability and adaptability.
2Volume of moving object
If components are arranged in a reduced space, then thickness is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The FPCB enables the device to utilize three-dimensional space by allowing the board to bend and conform to different shapes during folding operations. This dimensional flexibility allows components to be arranged in a compact folded state while maintaining adequate spacing and manufacturing tolerances, resolving the contradiction between reduced thickness and manufacturing precision requirements.
Data Source
AI summary
An electronic device may include, for example: a first housing, a second housing, a hinge cover, a hinge structure, a display, and a flexible printed circuit board (FPCB) including a rigid portion configured to be disposed on a first cover portion in the folded state, a first flexible portion connected to the rigid portion and configured to be at least partially bent along a second cover portion, and a second flexible portion connected to the rigid portion oppositely to the first flexible portion and configured to be at least partially bent along a third cover portion. The rigid portion is more rigid than the first flexible portion and the second flexible portion.