Foldable Display Support Plate Routing for Low-Loss Differential Signals
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Solution Overview
Problem
The narrow line width of signal lines in the bendable portion of foldable electronic devices leads to signal loss during high-speed signal transmission due to limited design constraints.
Innovation Solution
A support plate with a differential signal line structure, where the first and second signal lines extend along curved paths around openings, reducing signal loss by bypassing or overlapping sections in the bendable portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the signal line extends straight across the bendable portion, then the line width can be maintained, but the signal line cannot accommodate the bending movement and will cause stress concentration
Solution Approach 1:
The signal line is designed with curved paths including U-shaped sections that allow the line to flex and bend without creating stress concentration points. The curved geometry distributes mechanical stress along the entire length of the curve rather than concentrating it at sharp corners or rigid transitions, maintaining both structural integrity and electrical continuity during folding operations.
Solution Approach 2:
The signal line configuration is designed to be dynamically adaptable to the bending motion. The U-shaped sections and curved paths enable the signal line to change its geometric configuration as the device folds and unfolds, maintaining electrical connectivity while accommodating the dynamic mechanical deformation of the bendable portion.
2Length of moving object
If the signal line follows a curved path around openings, then the line width can be increased, but the signal line path becomes longer causing potential signal degradation
Solution Approach 1:
The differential signal line structure maintains consistent line width throughout the curved path, ensuring uniform electrical properties. The increased width along the entire curved trajectory improves current carrying capacity and reduces resistance, compensating for the longer path length and preventing signal degradation despite the extended route around the openings.
Solution Approach 2:
The first and second signal lines are designed as differential pairs that run parallel and closely spaced throughout their curved paths. This merging approach creates a controlled impedance environment that reduces electromagnetic interference and maintains signal integrity, allowing the signal to traverse the longer curved path without significant loss.
3Adaptability or versatility
If multiple openings are arranged at narrow intervals, then the bendable portion achieves sufficient flexibility, but the available space for signal line design is severely constrained
Solution Approach 1:
The U-shaped sections of the signal line are designed with smooth, continuous curves that elegantly navigate around the closely spaced openings. The curved geometry allows the signal line to follow the contours created by the opening arrangement without requiring complex routing, maintaining design simplicity while achieving the necessary flexibility through the bendable portion's structure.
Data Source
AI summary
An electronic device is provided. The electronic device includes a flexible display including a display panel, a polymer member disposed on a rear surface of the display panel, and a support plate disposed on a rear surface of the polymer member, wherein the support plate includes a first flat portion, a second flat portion, a bendable portion, and at least one differential signal line including a first signal line and a second signal line, the at least one differential signal line extending from at least a portion of the first flat portion to at least a portion of the second flat portion the bendable portion, wherein, in the bendable portion, the first signal line extends along a first curved path including a plurality of U-shaped sections disposed around a plurality of openings, and wherein, in the bendable portion, the second signal line extends along a second curved path including a plurality of U-shaped sections disposed around the plurality of openings.