Segmented Adhesive Layer for Flexible Display Stress Management
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Solution Overview
Problem
Flexible displays face issues with layer-shearing and delamination when repeatedly rolled or folded due to uneven stress distribution and shear stress accumulation in laminated structures.
Innovation Solution
The formation of isolated-patterns with partially different characteristics on adhesive layers within an interlayer adhesive structure helps distribute stress uniformly, reducing the likelihood of layer-shearing and delamination by varying the density and material of the adhesive patterns across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a laminated structure with adhesive layers is used to assemble the flexible display, then the display can be constructed with multiple functional layers, but shear stress accumulates during repeated rolling or folding causing layer-shearing and delamination
Solution Approach 1:
The adhesive layer is segmented into multiple regions with different characteristics: a first region with first adhesive material and a second region with second adhesive material having different shear stress resistance. This segmentation allows different parts of the adhesive layer to handle different stress conditions during rolling and folding, preventing uniform stress concentration that leads to delamination.
Solution Approach 2:
Different regions of the adhesive layer are assigned different local qualities in terms of adhesive material composition and shear stress resistance. The first adhesive material is used in regions experiencing lower shear stress while the second adhesive material with higher shear stress resistance is used in regions experiencing higher shear stress during flexing operations, optimizing overall bond stability.
2Ease of manufacture
If uniform adhesive material is used across the entire adhesive layer, then manufacturing is simplified, but stress distribution becomes uneven during rolling or folding leading to delamination
Solution Approach 1:
The adhesive layer incorporates local quality variations by using different adhesive materials in different regions. This allows the adhesive properties to be optimized for local stress conditions while maintaining a relatively simple manufacturing process through sequential coating or selective application methods.
Solution Approach 2:
The adhesive material parameters (composition, viscosity, shear strength) are changed across different regions of the adhesive layer to match the local stress conditions. This parameter variation ensures optimal stress distribution and bonding performance throughout the flexible display structure during flexing operations.
Data Source
AI summary
A flexible display and method of manufacturing the same are disclosed. In one aspect, the flexible display includes a display panel configured to display images, a window substrate disposed on a first surface of the display panel, and a lower passivation film attached to a second surface of the display panel opposing the first surface. The flexible display can also include a lower adhesive layer interposed between the display panel and the lower passivation film. The lower adhesive layer can include a plurality of isolated-pattern portions and a peripheral portion surrounding the isolated-pattern portions.