Flexible Display Neutral Plane Shift via Structural Patterns
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Solution Overview
Problem
Flexible display devices are prone to damage due to concentrated bending stress, which can cause cracks or peeling off, especially at layers with low rupture points, disrupting their functionality.
Innovation Solution
Incorporating structural patterns below the base film that move the neutral plane where bending stress is zero to layers with relatively low rupture points, thereby dispersing stress and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If bending stress is applied to the flexible display device, then the device can be folded or bent, but the bending stress concentrates on easily ruptured layers causing cracks or peeling
Solution Approach 1:
The patent applies local quality by creating a structural pattern with varying thickness distribution. The neutral plane position is locally adjusted through the thickness variation of the structural pattern, making different regions of the display sheet experience different stress conditions. This allows the neutral plane to be positioned at a specific depth where it provides optimal stress distribution, preventing concentration of bending stress at easily ruptured interfaces while maintaining flexibility.
2Reliability
If the neutral plane is positioned at a layer with low rupture point, then bending stress disperses to that layer, but other layers may still be vulnerable to stress concentration
Solution Approach 1:
The patent employs composite materials by stacking multiple layers with different mechanical properties (display sheet, base film, structural pattern). Each layer has different rupture points and stiffness characteristics. The structural pattern layer acts as a reinforcement that redistributes stress across the composite structure, ensuring that bending stress is dispersed throughout the entire stack rather than concentrated at a single interface, thereby protecting all layers from damage.
Data Source
AI summary
A flexible display device including; a base film; a display sheet formed over the base film; and a structural pattern formed below the base film for moving a neutral plane with respect to a bending stress applied to the display sheet to a layer having relatively low rupture point among the layers consisting of the display sheet. The neutral plane is moved to a layer having a relative low rupture point in a flexible display device by forming the structural patterns so that the bending stress applying to the layer having a relative low rupture point can be minimized.