Flexible OLED Substrate Groove Design for Enhanced Layer Adhesion
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Solution Overview
Problem
Flexible OLED display substrates face challenges in bonding strength and flexibility due to weak contact areas between organic and inorganic layers, leading to defects like separation or warp during manufacturing, which affects yield rates and performance.
Innovation Solution
A flexible substrate design featuring inorganic and organic layers with strategically formed grooves on their surfaces to increase contact areas and enhance adhesion, combined with a planarization layer for uniformity, using materials like polyimide and silicon oxide for improved flexibility and moisture/oxygen isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional flat-layer structure is used, then manufacturing process is simple, but bonding strength between organic and inorganic layers is weak
Solution Approach 1:
The patent applies local quality by creating grooves at specific locations on the inorganic layer surfaces rather than modifying the entire surface uniformly. These grooves are strategically positioned to maximize contact area enhancement while maintaining overall structural simplicity. The grooves create localized regions of increased adhesion between organic and inorganic layers without complicating the global layer architecture.
Solution Approach 2:
The patent utilizes curvature by forming grooves with curved profiles on the inorganic layer surfaces. These curved groove structures increase the surface area and create mechanical interlocking effects between layers, thereby enhancing bonding strength. The curved geometry provides better contact area compared to flat interfaces without significantly increasing manufacturing complexity.
2Reliability
If multiple grooves are added to increase contact area, then adhesion is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies partial action by forming grooves only on specific surfaces of the inorganic layers rather than on all surfaces. Specifically, grooves are created on the first inorganic layer and selectively on other layers based on adhesion needs. This selective approach enhances adhesion where required while reducing the overall manufacturing precision requirements compared to universal groove formation.
Solution Approach 2:
The patent segments the groove formation process by treating different inorganic layers and surfaces independently. Rather than requiring all grooves to be perfectly aligned across the entire device, the segmentation allows each groove to be optimized for its local adhesion needs. This reduces the cumulative precision requirements while maintaining overall reliability.
3Strength
If grooves are formed on all inorganic layer surfaces, then bonding strength is maximized, but device complexity increases
Solution Approach 1:
The patent applies local quality by selectively forming grooves only on specific inorganic layer surfaces where adhesion enhancement is most needed. Rather than uniformly adding grooves to all inorganic layer surfaces, the design identifies critical bonding interfaces and applies groove structures only there, thereby maximizing bonding strength improvement while minimizing added device complexity.
Solution Approach 2:
The patent uses partial action by forming grooves on only some inorganic layer surfaces rather than all surfaces. This selective approach provides sufficient bonding strength enhancement at the critical interfaces without the unnecessary complexity that would result from universal groove formation across all layers.
Data Source
AI summary
A flexible substrate is provided, and the flexible substrate includes a second organic layer, a first inorganic layer, a first organic layer, and a second inorganic layer, which are sequentially stacked. A surface, which is in contact with the first organic layer, of the first inorganic layer has a first groove. A surface, which is in contact with the first inorganic layer, of the second organic layer has a second groove. A surface, which is in contact with the second inorganic layer, of the first organic layer has a third groove. In a direction perpendicular to the first inorganic layer, any two of the first groove, the second groove and the third groove at least partially are not aligned with each other. A manufacturing method of the flexible substrate, a panel including the flexible substrate, and an electronic device including the flexible substrate are also provided.