Foldable Display Device Multiple Folding Axes Stress Distribution
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Solution Overview
Problem
Existing foldable display devices face challenges in distributing tensile and compressive stresses evenly across folding axes, leading to potential defects when folded in different directions, which affects the durability and reliability of the display surfaces.
Innovation Solution
The implementation of a foldable display device with multiple folding axes and a housing structure featuring rotational axles allows for flexible folding in various directions, distributing tensile and compressive stresses across different axes, thereby reducing defects and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single folding axis is used in existing foldable display devices, then the structure is simple, but tensile and compressive stresses are not evenly distributed leading to potential defects
Solution Approach 1:
The folding area is divided into multiple folding axes (first, second, and third folding axes) instead of using a single folding axis. This segmentation allows the stress to be distributed across multiple axes, preventing concentration of tensile and compressive stresses at a single location, thereby reducing defects and improving the durability of the display surface.
Solution Approach 2:
Different folding axes are positioned at specific locations within the folding area to optimize stress distribution. The first folding axis is positioned between the second and third folding axes, creating a localized configuration that evenly distributes stresses across the folding area while maintaining structural integrity.
2Reliability
If multiple folding axes are implemented, then stress distribution is improved, but the device structure becomes more complex
Solution Approach 1:
The folding axes are arranged in an asymmetric configuration where the first folding axis is positioned between the second and third folding axes. This asymmetric arrangement optimizes the stress distribution pattern across the folding area, allowing for more effective load management compared to a symmetric arrangement, while keeping the structural complexity manageable.
3Adaptability or versatility
If the display surface is folded in multiple directions, then versatility is improved, but the risk of defects increases without proper stress management
Solution Approach 1:
The folding area is segmented into multiple folding axes that enable folding in multiple directions. The first folding axis allows folding in one direction, while the second and third folding axes enable folding in another direction. This segmentation provides versatile folding capabilities while distributing stresses evenly across all axes, preventing defects that would otherwise result from uneven stress concentration.
Data Source
AI summary
A foldable display device includes a first display area, a second display area, and a first folding area between the first display area and the second display area. The first folding area includes first, second, and third folding axes. The first folding axis is between the second and third folding axes. The foldable display device is folded in one direction of the both directions on the basis of the first folding axis or folds in the other direction of the both directions on the basis of the second and third folding axes.