Flexible Display Device With Auxetic Stress Control Layer
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Solution Overview
Problem
Existing flexible display devices suffer from high defect rates due to mechanical stress and deformation during repetitive folding or rolling.
Innovation Solution
A flexible display device incorporating a stress control layer with an auxetic structure and a support layer, which includes a line pattern with negative Poisson's ratio and support sticks, to manage mechanical deformation and reduce stress on the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible display device is designed to be foldable or rollable, then adaptability and versatility are improved, but mechanical stress and deformation occur during repetitive folding or rolling, leading to increased defect rates
Solution Approach 1:
The stress control layer is divided into multiple units, each capable of independently controlling stress in its region. This segmentation allows the display panel to accommodate bending stresses without transferring them to the display panel itself, reducing defect rates while maintaining flexibility.
Solution Approach 2:
A stress control layer is introduced as an intermediary between the display panel and the external environment. This layer absorbs and distributes mechanical stresses generated during folding or rolling, preventing direct transmission of stress to the display panel and thereby reducing defects.
2Reliability
If a stress control layer with auxetic structure is added to reduce mechanical stress, then reliability is improved, but device complexity increases
Solution Approach 1:
The stress control layer utilizes materials with specific physical parameters, such as negative Poisson's ratio (auxetic structures), to achieve stress reduction. By carefully selecting materials with appropriate elastic moduli and Poisson's ratios, the layer effectively controls stress distribution without requiring overly complex structural designs.
3Manufacturing precision
If support sticks are added to maintain flat surface, then manufacturing precision is improved, but mechanical stress on display panel increases during folding or rolling
Solution Approach 1:
The support structure is designed to be dynamic rather than rigid. Support sticks are positioned and configured to provide mechanical support for maintaining flat surface during manufacturing and initial use, but they are arranged to allow flexibility during folding or rolling operations, preventing excessive stress accumulation on the display panel.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The stress control layer effectively prevents bending and improves surface smoothness, reducing defect rates and enhancing the durability of the display device.
Implementation Method 1
a stress control layer disposed on a rear surface of the display panel and including an auxetic structure having a negative Poisson's ratio
Data Source
AI summary
This display device may comprise: a display panel; a stress control layer which is disposed on the rear surface of the display panel and includes an auxetic structure having a negative Poisson's ratio; and a support layer which is disposed under the stress control layer and supports the display panel.