Multi-Layer Wire Structure for Flexible Display Bending Stress
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Solution Overview
Problem
Flexible display panels face issues with cracking in the bending portion due to the stress on wires, which affects the reliability and durability of touch functionality.
Innovation Solution
The implementation of a display device design where specific wires are strategically positioned outside the bending area, with other wires being formed within the bending area to distribute stress and prevent cracking, using materials like Ti/Al/Ti that are resistant to bending, and employing an encapsulation unit to seal and protect the display components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wires are disposed in the bending area to enable flexible display panel bending, then flexibility is improved, but wire cracking occurs due to stress concentration
Solution Approach 1:
The wire structure is segmented into multiple layers (first wire layer, second wire layer, third wire layer) with different configurations. The first wire layer extends beyond the bending area, the second wire layer is positioned within the bending area, and the third wire layer provides additional protection. This segmentation allows each layer to serve specific functions in stress distribution and crack prevention while maintaining overall flexibility.
Solution Approach 2:
The patent employs a composite wire structure combining multiple wire layers with different materials and configurations. The use of Ti/Al/Ti materials in the second wire layer within the bending area provides enhanced flexibility and stress resistance, while the combination of different wire layers creates a composite system that distributes mechanical stress more effectively than a single wire layer.
2Reliability
If multiple wire layers are added to prevent cracking, then wire cracking resistance is improved, but device complexity increases
Solution Approach 1:
The patent extracts the stress-bearing function from the main wire structure by positioning a specific second wire layer within the bending area. This extracted component is专门 designed to handle the mechanical stress during bending, while the first and third wire layers handle electrical connection and protection functions. This functional extraction allows the complex multi-layer structure to be managed more efficiently.
Solution Approach 2:
Different wire layers are assigned different materials and configurations based on their local requirements. The second wire layer within the bending area uses Ti/Al/Ti materials optimized for flexibility and stress resistance, while other layers use materials optimized for their specific functions. This local quality approach allows each part of the wire structure to be optimized for its specific role, managing complexity through functional specialization.
3Reliability
If wires are positioned outside the bending area to avoid stress, then wire cracking resistance is improved, but flexibility is reduced
Solution Approach 1:
The wire structure employs a nested configuration where the second wire layer (optimized for bending) is positioned within the bending area, while the first and third wire layers extend beyond it. This nesting allows the structure to maintain electrical connectivity across the entire display area while having a specialized inner layer that handles the bending stress, thus achieving both flexibility and crack resistance.
Data Source
AI summary
A display device includes a substrate including a bending area, a display area. A plurality of first wires is disposed above the substrate. A second wire is disposed above the plurality of first wires. A third wire is disposed above the second wire. At least a portion of the second wire and at least a portion of the third wire are disposed in the bending area.