Stretchable Display Line Layout Using Overlapping Layered Bridges
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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
A display apparatus design featuring a substrate 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 is simplified, but line load and structural stress increase during deformation
Solution Approach 1:
The patent transitions from planar (2D) line arrangement to three-dimensional (3D) layered arrangement. Output lines and connection lines are positioned in different layers and overlap in the planar view, utilizing the vertical dimension to reduce line load while maintaining connection functionality. This dimensional change allows lines to be distributed in space rather than concentrated in a single plane.
Solution Approach 2:
The patent implements nesting by placing output lines and connection lines in different layers where they overlap in the planar projection. The connection line in the second layer is positioned to overlap with the output line in the first layer, creating a nested spatial arrangement that reduces the mechanical load on individual lines during substrate deformation.
2Area of stationary object
If bridge portions are minimized to reduce substrate area, then manufacturing efficiency improves, but structural integrity during stretching deteriorates
Solution Approach 1:
The substrate is segmented into island portions and bridge portions with distinct functional roles. Bridge portions are specifically designed as flexible connection regions that can deform during stretching, while island portions maintain structural integrity. This segmentation allows the bridge portions to bear the mechanical stress of deformation, protecting the overall substrate structure.
Solution Approach 2:
Different regions of the substrate are assigned different structural qualities: island portions have higher structural rigidity to maintain device functionality, while bridge portions have enhanced flexibility to accommodate deformation. The bridge portions are positioned at center of side surfaces and designed with specific geometries to optimize their mechanical properties for stretching applications.
3Device complexity
If multiple lines are arranged in the same layer, then routing is simplified, but line stress and potential damage during deformation increase
Solution Approach 1:
The patent uses vertical layering to separate lines that would otherwise be routed together in the same plane. By moving connection lines to a second layer, the design reduces planar routing complexity while simultaneously distributing mechanical stress across multiple layers, preventing stress concentration on individual lines during substrate deformation.
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.