Stretchable Display Wiring Layout for Stress-Resistant Interconnects
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Solution Overview
Problem
Existing flexible display devices face challenges in preventing damage during deformation and stretching, which can lead to structural integrity issues and potential failure of electrical connections.
Innovation Solution
The display device incorporates a substrate with island and bridge portions, multiple conductive layers, and specific wiring configurations, including varying widths and insulating layers to enhance structural flexibility and electrical connectivity, with conductive layers having different thicknesses and insulating materials to manage stress and maintain electrical connections during deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device uses a flexible substrate with bridge portions for deformation, then flexibility and adaptability are improved, but structural integrity and reliability deteriorate due to potential damage during stretching
Solution Approach 1:
The substrate is divided into multiple island portions and bridge portions, where each island can deform independently while bridge portions provide controlled connection paths. This segmentation allows the display device to flex without compromising overall structural integrity, as stress is distributed across multiple discrete segments rather than concentrated in a continuous structure.
Solution Approach 2:
Different regions of the substrate have different properties: island portions are designed to be flexible and deformable, while bridge portions have optimized thickness and material composition to provide mechanical support and maintain electrical connectivity during deformation. This local differentiation of properties enables simultaneous flexibility and structural integrity.
2Reliability
If multiple conductive layers with varying thicknesses are used to manage stress distribution, then reliability during deformation is improved, but device complexity increases
Solution Approach 1:
The conductive layers have different thicknesses optimized for their specific functions: thicker layers in regions requiring stress resistance and thinner layers where flexibility is prioritized. By varying the thickness parameter across different layers and locations, the device achieves reliable electrical connections during deformation without requiring an excessive number of layers, thus managing complexity.
Solution Approach 2:
The device employs multiple conductive layers with different material compositions and thicknesses stacked together, creating a composite structure that combines the advantages of each material. This composite approach enables stress management and maintained electrical connectivity while keeping the overall structure relatively simple compared to using a single complex material system.
3Reliability
If insulating layers with different thicknesses are implemented to manage stress, then structural integrity during stretching is improved, but manufacturing complexity increases
Solution Approach 1:
Insulating layers are applied with different thicknesses at different locations on the substrate: thicker insulating layers are positioned in bridge portions where mechanical support and stress resistance are critical, while thinner insulating layers are used in island portions where flexibility is prioritized. This localized differentiation improves structural integrity during stretching while maintaining reasonable manufacturability through targeted application processes.
Data Source
AI summary
A display device includes a substrate including an island portion, a first bridge portion extending from the island portion in a first direction, and a second bridge portion extending from the island portion in a second direction crossing the first direction, a first conductive layer disposed on the substrate and including a first voltage line extending from the island portion to the first bridge portion and the second bridge portion, a second conductive layer disposed on the first conductive layer and including signal lines extending from the island portion to the first bridge portion and a data line extending from the island portion to the second bridge portion, and a third conductive layer disposed on the second conductive layer and including a second voltage line and a third voltage line, which extend from the island portion to the first bridge portion and the second bridge portion, respectively.