Stretchable Display Line Layout With Overlapping Bridge Layers
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Solution Overview
Problem
Existing stretchable display apparatuses face challenges in minimizing the load on lines during deformation, which can lead to structural stress and potential damage.
Innovation Solution
The display apparatus incorporates a substrate design with island and bridge portions, where gate driving circuits and input/output lines are arranged in different layers, overlapping each other, and connected through bridge portions, allowing for flexible and stretchable configurations while minimizing line load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If lines are arranged in the same layer and connected directly between island portions, then connection simplicity is improved, but line load and structural stress increase during stretching
Solution Approach 1:
The patent transitions from planar (2D) line arrangement to three-dimensional (3D) multi-layer arrangement. Lines are distributed across multiple layers with overlapping configurations, transforming the connection geometry from direct lateral connections to vertical and diagonal multi-layer paths. This dimensional change reduces the mechanical load on individual lines while maintaining electrical connectivity during substrate deformation.
Solution Approach 2:
The patent implements a nested hierarchical structure where multiple layers of lines are stacked vertically, with each layer containing subsets of the complete line set. The first, second, and third layers are nested within the same spatial footprint but at different vertical positions, creating a compact multi-layer configuration that reduces line stress through distributed load bearing.
2Ease of manufacture
If gate driving circuit and input lines are arranged in the same layer, then manufacturing process is simplified, but structural integrity during stretching deteriorates
Solution Approach 1:
The patent separates the gate driving circuit and input lines into different vertical layers, transforming the manufacturing challenge from complex multi-layer alignment to a standardized multi-layer deposition process. The gate driving circuit is positioned in one layer while input lines are routed in other layers, with through-layer connections established using conventional via holes and conductive plugs, making the 3D arrangement manufacturable with standard semiconductor fabrication techniques.
3Strength
If lines are arranged in multiple overlapping layers, then line stress during stretching is reduced, but device complexity increases
Solution Approach 1:
The patent creates a universal multi-layer line structure that serves multiple functions simultaneously: electrical signal transmission, mechanical stress distribution, and substrate deformation accommodation. The same overlapping line architecture provides both electrical connectivity and structural flexibility, eliminating the need for separate stress-management components and reducing overall device complexity despite the multi-layer configuration.
Data Source
AI summary
A display apparatus includes a substrate including a first island portion and a second island portion spaced apart from each other and a bridge portion connected between the first island portion and the second island portion, a gate driving circuit arranged in the first island portion, a plurality of first input lines arranged in the second island portion, an output line arranged in the bridge portion and connected to the gate driving circuit, and a connection line arranged in the bridge portion and connected to at least one of the plurality of first input lines, where the output line and the connection line are arranged in different layers, respectively, and arranged to overlap each other.