Multi-segment Signal Lines for Flexible Display Bending Regions
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Solution Overview
Problem
Signal lines in bending regions of flexible displays are prone to damage and impedance issues, leading to signal delay or distortion, affecting the display quality of electronic products.
Innovation Solution
An active device array structure with multi-segments signal lines in the bending region, where the signal lines include multiple segments connected in parallel and alternately with single-segment structures, reducing the risk of damage from bending stress and maintaining uniform impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal lines are made as single continuous structures, then the structure is simple and easy to manufacture, but the signal lines are prone to damage and impedance issues in bending regions
Solution Approach 1:
The signal lines in the bending region are divided into multiple segments (first signal lines, second signal lines, third signal lines) that are connected in parallel. Each segment can independently withstand bending stress, preventing complete line failure. The segmentation allows the signal transmission path to be divided into multiple redundant routes, where if one segment is damaged, others can still function.
Solution Approach 2:
Different regions of the display panel are assigned different signal line configurations. The bending region (first region) contains the multi-segment parallel structure, while the non-bending region (second region) uses conventional single continuous signal lines. This local differentiation optimizes reliability where needed without unnecessarily complicating the entire structure.
2Adaptability or versatility
If signal lines are repeatedly folded and unfolded in bending regions, then the display achieves flexibility, but defects on signal lines gradually form leading to damage or breakage
Solution Approach 1:
The parallel multi-segment structure is pre-configured in the bending region to cushion against future bending damage. By having redundant parallel paths before any damage occurs, the system is prepared to absorb the stress of repeated folding and unfolding without immediate failure. The structure anticipates potential breakage points and provides alternative conduction paths in advance.
Solution Approach 2:
The signal line structure adapts dynamically to the bending state. When the display is bent, the parallel segments can flex independently, distributing the mechanical stress across multiple paths rather than concentrating it on a single continuous line. This dynamic response to bending stress prevents fatigue accumulation that leads to defects.
3Adaptability or versatility
If signal lines in bending regions are damaged, then the display can be flexible, but impedance rises causing signal delay or distortion
Solution Approach 1:
Multiple signal line segments are merged into a parallel configuration within the bending region. This combining of multiple paths ensures that even if one path suffers impedance changes or damage, the merged parallel structure maintains overall signal transmission quality. The combined effect of multiple segments provides redundancy that preserves signal integrity.
Solution Approach 2:
The electrical parameters of the signal lines are optimized in the bending region through the parallel multi-segment structure. By changing the physical configuration from single continuous to multiple parallel segments, the impedance characteristics are improved to remain more stable during bending operations, reducing signal delay and distortion.
Data Source
AI summary
An active device array structure including a substrate including a first region and a second region, and first signal lines, second signal lines, third signal lines, and active devices disposed on the substrate is provided. A bending degree of the first region is greater than that of the second region. The first signal lines and the second signal lines cross through the first region and the second region. Each first signal line includes a first multi-segments structure located in the first region. Each first multi-segments structure includes first segments connected in parallel. An extending direction of the third signal lines is intersected with the first signal lines and the second signal lines. Each third signal line is electrically connected to one first signal line. The active devices are electrically connected to the second and the third signal lines, or the first and the third signal lines.