Grooved Inorganic Insulating Layer for Flexible Display Wiring
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Solution Overview
Problem
Display apparatuses face defects such as broken wiring during the bending process, primarily due to high tension stress, especially when the inorganic insulating layer lacks grooves, leading to cracks and increased probability of wiring defects.
Innovation Solution
Incorporating an inorganic insulating layer with grooves and an organic material layer that fills these grooves, reducing tension stress on the wiring unit by absorbing stress and preventing cracks, while the organic material layer's lower hardness compared to the inorganic layer minimizes the likelihood of defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the inorganic insulating layer is made continuous without grooves, then the structural integrity is improved, but the tension stress concentration increases leading to wiring defects
Solution Approach 1:
The inorganic insulating layer is segmented by forming grooves that divide it into multiple sections. These grooves allow the layer to flex and distribute stress during bending, preventing crack propagation while maintaining overall structural integrity. The wiring unit is positioned to overlap these grooves, ensuring reliable electrical connections despite the segmentation.
Solution Approach 2:
The inorganic insulating layer has different structural properties at different locations: continuous and rigid in non-bending areas for structural support, and segmented with grooves in bending areas for stress relief. The wiring unit is strategically positioned to overlap the grooved regions, combining the benefits of both continuous and segmented structures in appropriate locations.
2Stability of the object's composition
If the inorganic insulating layer is made rigid to maintain structural stability, then the structural stability is improved, but the tension stress during bending increases causing cracks
Solution Approach 1:
Grooves are formed in the inorganic insulating layer to segment it into multiple sections. This segmentation allows the rigid layer to flex during bending by creating hinge points at the grooves, distributing tension stress and preventing crack formation while maintaining structural stability in non-bending regions.
Solution Approach 2:
The display apparatus uses a composite structure combining the rigid inorganic insulating layer with the flexible organic insulating layer. The inorganic layer provides structural stability and protection, while the organic layer provides flexibility and stress relief during bending, creating a composite system that exhibits both rigidity and flexibility.
Data Source
AI summary
A display apparatus includes: a substrate having a bending area between a first area and a second area; an inorganic insulating layer arranged on the substrate, the inorganic insulating layer having an opening or a groove corresponding to the bending area; a wiring unit extending to the second area through the bending area, the wiring unit arranged on the inorganic insulating layer and at least a portion thereof overlapping the opening or the groove; and an organic material layer between the inorganic insulating layer and the wiring unit, the organic material layer configured to fill the opening or the groove, wherein the wiring unit comprises a first wire and a second wire that are adjacent to each other, and a width in which the opening or the groove overlaps the first wire is different from the width in which the opening or the groove overlaps the second wire.