Auxetic Display Structures for Impact Resistance During Folding
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Solution Overview
Problem
Existing flexible and rollable display devices face challenges in impact resistance and surface quality degradation during rolling and folding.
Innovation Solution
Incorporation of a display device with a first and second auxetic structure having negative Poisson's ratio, overlapping the display panel, and a support layer to enhance impact resistance and surface quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If flexible and rollable display devices are implemented to satisfy user experience, then adaptability and versatility are improved, but impact resistance deteriorates and surface quality degrades during rolling and folding
Solution Approach 1:
The stress control layer is divided into multiple auxetic structures with different Poisson's ratios arranged in specific patterns. These segmented structures work together to distribute and control stress during deformation, preventing surface quality degradation while maintaining flexibility and rollability.
Solution Approach 2:
The patent utilizes auxetic structures with negative Poisson's ratios, where the lateral dimension increases when the longitudinal dimension is stretched. This parameter change in material behavior allows the stress control layer to expand laterally during rolling, counteracting stress concentration and maintaining surface quality while enabling flexible and rollable display functionality.
2Ease of operation
If the display device is made flexible and rollable, then ease of operation is improved, but the structure becomes more complex
Solution Approach 1:
The stress control layer with auxetic structures serves multiple functions simultaneously: it controls stress during deformation, maintains surface quality, enables rolling and folding, and provides structural support. This multi-functionality reduces the need for additional separate components, thereby managing complexity while enhancing ease of operation.
Solution Approach 2:
The patent employs a composite structure combining the display panel with a stress control layer featuring auxetic structures. This composite design integrates multiple functionalities within a unified structure, allowing the device to be flexible and rollable without requiring separate complex mechanisms for each function.
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 auxetic structures reduce stress on mechanical deformation, improving impact resistance and maintaining surface quality during repetitive rolling or folding.
Implementation Method 1
a first auxetic structure including a first pattern that defines a plurality of first openings, overlapping the display panel, and having a negative Poisson's ratio, a second auxetic structure including a second pattern that defines a plurality of second openings, overlapping the first auxetic structure, and having a negative Poisson's ratio
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
A display device includes a display panel, a first auxetic structure including a first pattern that defines a plurality of first openings, overlapping the display panel, and having a negative Poisson's ratio, a second auxetic structure including a second pattern that defines a plurality of second openings, overlapping the first auxetic structure, and having a negative Poisson's ratio, and a support layer disposed below the display panel and supporting the display panel.