Foldable Display Layer Structure Without Adhesive Stress Interfaces
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Foldable display devices face challenges in maintaining flexibility and preventing damage due to the complexity of stresses among stacked layers when folded or bent.
Innovation Solution
The display device includes a display panel, an optical layer, and a cover layer, where the cover layer is directly formed on the optical layer without any extra adhesive layers, reducing stress and enhancing flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple stacked layers or films are used in the display device, then the display device can provide complete display functions and protection, but the stresses among the layers become more complicated, limiting the folding or bending angle and potentially damaging the layers or films
Solution Approach 1:
The patent removes the adhesive layer from the stacked structure, extracting the source of stress accumulation. By directly bonding the cover layer to the optical layer without an intermediate adhesive layer, the design eliminates the complex stress distribution that occurs at adhesive interfaces, thereby reducing overall stress complexity while maintaining structural integrity and display functionality
Solution Approach 2:
The patent merges the cover layer and optical layer into a directly bonded structure, eliminating the adhesive layer that causes stress complications. This merging simplifies the layered structure by reducing the number of interfaces where stress can accumulate, allowing for better foldability and bending performance while preserving all necessary display functions
2Reliability
If multiple stacked layers or films are used in the display device, then the display device can provide complete display functions and protection, but the folding or bending angle is limited
Solution Approach 1:
By removing the adhesive layer from the stacked structure, the patent eliminates the primary constraint on folding angle. The direct bonding between cover layer and optical layer creates a more flexible interface that can accommodate larger bending angles without delamination or stress concentration, thereby improving adaptability for foldable applications
Solution Approach 2:
The patent changes the bonding interface parameters by eliminating the adhesive layer and creating a direct bond between layers. This parameter change in the interface structure reduces rigidity and increases flexibility, enabling larger folding angles and improving the device's adaptability for various folded configurations
3Reliability
If multiple stacked layers or films are used in the display device, then the display device can provide complete display functions and protection, but damage to the layers or films occurs during folding
Solution Approach 1:
The patent extracts and removes the adhesive layer that creates stress concentration points and potential failure interfaces. By directly bonding the cover layer to the optical layer, the design eliminates the weak interface where damage typically initiates during folding, thereby improving layer durability while maintaining complete display functionality
Solution Approach 2:
The direct bonding structure acts as a form of beforehand cushioning by creating a more uniform stress distribution across the layered structure. Without adhesive layers to create stress concentrations, the structure is better prepared to withstand folding stresses, preventing damage before it occurs
Data Source
AI summary
The present disclosure provides a display device including a display panel, an optical layer, and a cover layer. The display panel has a substrate with two opposite first edges. The optical layer is disposed on the display panel, and the optical layer has two opposite second edges corresponding to the two opposite first edges respectively. The cover layer is disposed on the optical layer. 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 are not aligned.