Flexible Display Bridge Areas with Serpentine Grooves for Stress Distribution
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Solution Overview
Problem
Existing flexible display apparatuses face challenges in maintaining structural integrity and preventing damage from stress concentration during stretching and shrinking operations.
Innovation Solution
The display apparatus incorporates a substrate with island and bridge areas, where the bridge areas have a serpentine shape and are equipped with a first line and insulating layers that define groove patterns, allowing for varying elongation rates in different areas to distribute stress effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bridge areas have a serpentine shape with groove patterns, then stress distribution is improved and damage during stretching is reduced, but the structural complexity and manufacturing difficulty increase
Solution Approach 1:
The bridge areas are designed with serpentine shapes featuring curved segments instead of straight lines. This curvature allows the bridge areas to deform more uniformly during stretching operations, distributing stress away from concentrated points and preventing structural damage while maintaining flexibility.
Solution Approach 2:
Groove patterns are selectively introduced into specific regions of the bridge areas, particularly in curved segments where stress concentration is most likely to occur. These localized groove features modify the mechanical properties only where needed, enhancing stress distribution without unnecessarily complicating the entire bridge structure.
2Reliability
If groove patterns are defined in the bridge areas by insulating layers, then stress concentration is reduced during deformation, but the manufacturing process complexity increases
Solution Approach 1:
The groove patterns are integrated into the existing insulating layer structure rather than being added as separate components. The insulating layers serve dual functions: providing electrical insulation and defining the groove patterns that manage stress distribution. This merging reduces the number of discrete manufacturing steps while achieving multiple objectives.
Solution Approach 2:
The groove patterns modify the physical parameters of the insulating layers in bridge areas, such as creating controlled variations in thickness or introducing surface features during the insulating layer formation process. These parameter changes enable stress management while utilizing standard insulating layer deposition techniques.
3Reliability
If the first line is arranged closer to the outer edge of round portions, then stress distribution during stretching is improved, but the design complexity and precision requirements increase
Solution Approach 1:
The first line is deliberately positioned asymmetrically within the bridge area structure, specifically closer to the outer edge of round portions rather than at the center. This asymmetric positioning optimizes stress distribution during stretching by aligning the line with regions of lower stress concentration, improving reliability while maintaining manufacturability through clear design guidelines.
Data Source
AI summary
A display apparatus includes a substrate including island areas and bridge areas, where each of the bridge areas has a serpentine shape and connects adjacent island areas to each other, a first line arranged in the bridge area, and a first insulating layer disposed on the first line, where a plurality of groove patterns is defined in the bridge areas by the first insulating layer.