Insulation Plate Stress Control Patterns for Foldable Display Durability
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Solution Overview
Problem
Conventional display devices lack flexibility and durability in their folding mechanisms, particularly in the folding areas, which can lead to reduced durability and increased stress concentrations during folding operations.
Innovation Solution
A display device design incorporating a support member with predetermined rigidity, featuring a display panel, insulation plate, and digitizer, where the insulation plate includes stress control patterns and varying curvature areas to manage stress distribution and improve flexibility, while maintaining durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the insulation plate is made rigid to maintain structural stability, then the strength and stability are improved, but the flexibility and durability in folding areas deteriorate due to stress concentration
Solution Approach 1:
The insulation plate is segmented into multiple regions with different structural characteristics: a first region with a flat lower surface providing rigidity, and a second region with stress control patterns (grooves or openings) providing flexibility. This segmentation allows the plate to simultaneously maintain structural stability and accommodate folding movements without cracking.
Solution Approach 2:
Different regions of the insulation plate are given different local qualities: the first region has a flat lower surface for structural support, while the second region has grooves or openings to reduce stress concentration. This local differentiation enables the plate to exhibit both rigidity and flexibility in appropriate areas, resolving the contradiction between strength and durability.
2Reliability
If stress control patterns are added to improve flexibility in folding areas, then the durability is improved, but the device complexity increases
Solution Approach 1:
The insulation plate is divided into a first region without patterns and a second region with stress control patterns. This segmentation allows the complex patterned structure to be localized only where needed for flexibility, while the majority of the plate maintains a simple flat structure, thereby minimizing overall device complexity while still achieving improved durability.
Solution Approach 2:
Stress control patterns are applied locally only in the second region where flexibility is needed, rather than throughout the entire insulation plate. This localized application of complexity reduces the overall device complexity while still providing the necessary durability improvement in the folding areas.
3Ease of manufacture
If the insulation plate uses a uniform structure throughout, then the manufacturing simplicity is improved, but the flexibility in folding areas deteriorates
Solution Approach 1:
The insulation plate is segmented into a first region with uniform structure for easy manufacturing and a second region with stress control patterns for improved flexibility. This segmentation allows the majority of the plate to be manufactured simply while only a localized portion requires the more complex patterned structure, balancing manufacturing ease with operational flexibility.
Solution Approach 2:
The uniform simple structure is maintained in the first region for manufacturing simplicity, while stress control patterns are introduced locally in the second region to provide the necessary flexibility. This local differentiation resolves the contradiction by applying complexity only where operational flexibility is required.
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 solution enhances the flexibility and durability of the folding area by distributing stress effectively, reducing the risk of cracks and improving the overall folding performance of the display device.
Implementation Method 1
Each of the first area and the third area includes a first stress control pattern including first grooves defined in an upper surface of the insulation plate
Implementation Method 2
the second area includes a second stress control pattern including at least one of second grooves or openings defined in a lower surface of the insulation plate
Implementation Method 3
The insulation plate includes at least one of plastic, fiberglass reinforced plastic, or glass
Data Source
AI summary
A display device includes: a display panel including first and second non-folding areas, and a folding area between the first and second non-folding areas, the display device being configured to operate in a first mode in an unfolded state and a second mode in a folded state; and a plate under the display panel and including a folding portion corresponding to the folding area, the folding portion including: a first area; a second area further away from the first non-folding area than the first area is; and a third area closer to the second non-folding area than the second area is. Each of the first and third areas includes a first stress control pattern including first grooves in a first surface of the plate. The second area includes a second stress control pattern including at least one of second grooves or openings in a second surface of the plate.