Flexible PCB Layer Layout for Wearable Signal Integrity
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Solution Overview
Problem
Existing electronic devices, such as wearable electronic devices, face challenges in efficiently integrating flexible printed circuit boards (FPCBs) that accommodate both data and power signal transmission while allowing for flexibility and compact design.
Innovation Solution
A wearable electronic device is designed with a flexible printed circuit board (FPCB) that includes multiple substrate layers with non-overlapping circuit regions for data and power signals, connected by non-overlapping connecting layers, allowing for efficient signal transmission and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple substrate layers with circuit lines are stacked to transmit both data and power signals, then signal transmission capability is improved, but the risk of electromagnetic interference and signal quality degradation increases
Solution Approach 1:
The patent divides the circuit board into multiple substrate layers with distinct functional regions. Data lines and power lines are segmented into separate circuit regions on different layers, reducing electromagnetic interference while maintaining high signal transmission capability through optimized layer stacking
Solution Approach 2:
The patent implements non-uniform layout strategies where connecting layers are strategically positioned to overlap with power line regions but avoid data line regions. This local differentiation optimizes power distribution while protecting data signal integrity, resolving the contradiction between transmission capability and signal quality
2Reliability
If connecting layers are positioned to overlap circuit regions for efficient electrical connection, then electrical connectivity is improved, but electromagnetic interference and signal interference increase
Solution Approach 1:
The patent applies differentiated overlap strategies for connecting layers based on local circuit region characteristics. Connecting layers overlap power line regions to ensure efficient power distribution while deliberately avoiding data line regions to minimize electromagnetic interference, achieving both connectivity and interference reduction
Solution Approach 2:
The patent introduces ground lines as intermediary elements between power lines and data lines in multi-layer configurations. These ground lines act as shields that mediate electromagnetic field interactions, allowing connecting layers to maintain electrical connectivity while reducing harmful electromagnetic interference through strategic grounding
3Adaptability or versatility
If the FPCB structure is made flexible to accommodate wearable device design, then adaptability and compactness are improved, but manufacturing precision and structural stability deteriorate
Solution Approach 1:
The patent segments the FPCB into multiple thin substrate layers rather than using a single thick layer. This segmentation maintains flexibility for wearable device adaptation while improving manufacturing precision through standardized thin-layer fabrication processes and enhancing structural stability through controlled layer stacking with connecting layers
Solution Approach 2:
The patent employs composite material construction with multiple substrate layers and connecting layers forming a laminated structure. This composite approach provides the flexibility needed for wearable devices while maintaining manufacturing precision through controlled material properties and structural stability through inter-layer bonding
Data Source
AI summary
A wearable electronic device is provided. The wearable electronic device includes a frame configured to accommodate at least one lens or at least one display, a temple connected to an end of the frame, and a flexible printed circuit board (FPCB) of which at least a portion is disposed in the temple and extending in a longitudinal direction. The FPCB includes a plurality of substrate layers including at least one circuit line formed on a surface thereof and disposed to overlap in a thickness direction and at least one connecting layer disposed between the plurality of substrate layers and configured to connect surfaces of adjacent substrate layers, wherein the FPCB, when viewed in the thickness direction, includes a first circuit region in which a data line for transmitting a data signal is formed, and the at least one connecting layer is disposed not to overlap the first circuit region.