Foldable Display Plate Groove Geometry for Impact Resistance
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Solution Overview
Problem
Foldable display devices face challenges in maintaining impact resistance at the folding portions, which are inherently weak due to stress concentration in the grooves, leading to potential damage during use.
Innovation Solution
The display device incorporates a plate with grooves in the folding portion, optimizing their width and spacing to enhance impact resistance, and employs different elasticity coefficients and folding directions for improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If grooves are formed in the folding portion to enable folding, then flexibility is improved, but impact resistance deteriorates due to stress concentration
Solution Approach 1:
The plate is segmented by forming multiple grooves in the folding portion, which divides the stress distribution across multiple lines rather than concentrating it at a single fold line. This segmentation allows the structure to maintain flexibility while distributing impact forces more evenly throughout the folding region.
Solution Approach 2:
Different regions of the plate are given different properties: the folding portion contains grooves with specific width (50-150 μm) and spacing (100-200 μm) to provide flexibility, while the non-folding portions maintain solid structure for impact resistance. The grooves are strategically positioned only where folding is needed, creating local variations in mechanical properties.
2Ease of operation
If groove width is increased to improve folding ease, then flexibility is improved, but structural strength deteriorates
Solution Approach 1:
The groove width is optimized within a specific parameter range (50-150 μm) to achieve the desired balance between flexibility and strength. By controlling the groove width within this range, the structure becomes flexible enough for easy folding while maintaining sufficient structural integrity to resist impact forces.
Solution Approach 2:
Instead of making the grooves extremely wide for maximum flexibility, the invention uses partial action by limiting groove width to 150 μm maximum. This partial groove width provides sufficient flexibility for folding while avoiding excessive weakening of the plate structure that would occur with wider grooves.
3Manufacturing precision
If groove spacing is decreased to improve folding precision, then folding accuracy is improved, but manufacturing difficulty increases
Solution Approach 1:
The groove spacing is optimized within a specific parameter range (100-200 μm) to achieve the desired balance between folding precision and manufacturing ease. By controlling the spacing within this range, the structure achieves precise folding characteristics while remaining manufacturable using standard fabrication processes.
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 optimized grooves and elasticity coefficients improve the display device's impact resistance and folding reliability, minimizing damage from external impacts while maintaining flexibility.
Implementation Method 1
the folding portions, which are inherently weak due to stress concentration in the grooves
Implementation Method 2
An elasticity coefficient of the folding portion may be in a range of 0.5 MPa to 50 MPa
Data Source
AI summary
A display device includes: a display module; and a plate on one side of the display module. The plate has a folding portion and a plurality of grooves in the folding portion. The grooves neighbor each other in a first direction and a second direction perpendicular to the first direction. A width of the groove in the first direction is in a range of 50 μm to 150 μm, and a length of the groove in the second direction is in a range of 2 mm to 4 mm.