Flexible Connection Member EMI Shielding Signal Integrity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electronic devices face challenges in efficiently connecting circuit boards and electrical components due to limitations in flexible connection members, which can lead to impedance changes and signal loss in high-speed signal lines.
Innovation Solution
A flexible connection member is designed with an insulation layer, signal lines, ground lines, and connection lines that are electrically connected to the ground sheet, allowing for efficient electrical connections between circuit boards and components while providing an electromagnetic interference (EMI) shielding structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional flexible connection members are used to connect circuit boards and electrical components, then the device structure can be simplified, but impedance changes and signal loss occur in high-speed signal lines
Solution Approach 1:
The flexible connection member is segmented into distinct functional layers: signal lines, ground lines, and connection lines are separately routed and connected through via holes. This segmentation allows independent optimization of signal transmission paths and ground reference paths, reducing impedance variations and improving signal integrity without requiring a completely complex rigid structure.
Solution Approach 2:
The patent transitions from planar 2D routing to 3D spatial routing by using via holes to connect different layers. The connection lines extend vertically through the flexible connection member thickness, creating a three-dimensional network that maintains signal integrity while preserving flexibility. This dimensional transition allows ground lines to be positioned adjacent to signal lines in the vertical dimension, providing consistent impedance control.
2Reliability
If ground lines are spaced apart to reduce interference, then signal interference is reduced, but ground connection reliability deteriorates
Solution Approach 1:
Multiple ground lines are merged into a single ground sheet at the connection region. This merging consolidates the ground potential across different signal paths, ensuring consistent reference voltage and improving ground connection reliability. The ground sheet acts as a unified ground reference that reduces ground bounce and potential differences while maintaining adequate spacing between signal lines to minimize electromagnetic interference.
Solution Approach 2:
The ground sheet serves as an intermediary structure that connects multiple ground lines through via holes. This intermediary element provides a low-impedance path for return currents and stabilizes the ground potential across the flexible connection member. The ground sheet mediates between the spaced-apart ground lines and the connection points, ensuring reliable ground connection while allowing signal lines to maintain adequate separation.
Data Source
AI summary
An electronic device is provided. The electronic device includes a housing, a circuit board, at least one electrical component disposed inside the housing, and a flexible connection member electrically connected to the circuit board and the at least one electrical component, wherein the flexible connection member includes an insulation layer, a signal line disposed on the insulation layer, a first ground line disposed on the insulation layer, a second ground line disposed on the insulation layer and spaced apart from the first ground line, a ground sheet disposed on the insulation layer, a first connection line electrically connected to the first ground line and the ground sheet and at least partially extending along a first direction, and a second connection line electrically connected to the second ground line and the ground sheet, at least partially extending along a second direction different from the first direction and crossing the first connection line, and wherein at least a portion of the second connection line contacts at least a portion of the first connection line.