Foldable Display Cover-Polarizer Structure for Lower Bending Stress
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Foldable display devices face limitations in folding or bending angles due to stress complications among stacked layers, which can lead to damage, and existing solutions do not adequately mitigate these issues.
Innovation Solution
A foldable display device design featuring a display panel with a multi-layered polarizer layer and a cover layer where the cover layer is directly formed on the polarizer layer without any adhesive, reducing stress and incorporating a flexible cover layer with specific thickness and material properties to enhance flexibility and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple stacked layers are used in the display device, then the display functionality is improved, but the stress complexity increases and limits folding angle
Solution Approach 1:
The adhesive layer between the cover layer and polarizer layer is removed entirely. The cover layer is directly formed on the polarizer layer without any adhesive intermediary, eliminating the source of stress complexity while maintaining the necessary structural integrity and display functionality
Solution Approach 2:
The cover layer and polarizer layer are merged into a direct contact structure without an adhesive layer. This reduces the total number of interfaces and stress points in the stacked layers, simplifying the stress distribution while preserving display performance
2Strength
If multiple stacked layers with adhesive are used, then structural integrity is improved, but damage during folding increases
Solution Approach 1:
The adhesive layer is extracted and removed from the structure. By eliminating the adhesive between the cover layer and polarizer layer, the patent prevents adhesive failure and delamination that would occur during folding, thereby reducing damage while maintaining structural integrity through direct bonding
Solution Approach 2:
The cover layer is designed as a flexible thin film structure that can bend without causing damage. By making the cover layer itself flexible and directly bonding it to the polarizer layer, the structure can accommodate folding movements without creating stress concentration points that would lead to damage
3Strength
If adhesive layer is used between cover layer and polarizer layer, then bonding strength is improved, but stress distribution becomes complicated
Solution Approach 1:
The adhesive layer is completely removed from the structure. The cover layer is directly formed on the polarizer layer through direct bonding, eliminating the intermediate adhesive that would complicate stress distribution while maintaining adequate bonding strength for the application
Solution Approach 2:
The direct contact between the cover layer and polarizer layer creates a more homogeneous stress distribution across the interface. Without the adhesive layer with different mechanical properties, the stress is distributed more uniformly through the bonded surfaces, simplifying the overall stress pattern
Data Source
AI summary
A display device is provided, and includes a display panel, a multi-layered polarizer layer, and a cover layer. The display panel has a substrate with two opposite first edges. The multi-layered polarizer layer is disposed on the display panel and has a bottom layer with two opposite second edges corresponding to the two opposite first edges respectively. The cover layer is disposed on the multi-layered polarizer layer. A distance between one of the two opposite first edges and one of the two opposite second edges corresponding to the one of the two opposite first edges is greater than 0 and less than or equal to 5 millimeters.