Foldable Display Device Layer Stress Management
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Solution Overview
Problem
Existing foldable display devices face challenges in achieving high-quality displays while maintaining durability and flexibility, particularly in switching between folded and unfolded states.
Innovation Solution
A foldable display device is designed with a panel pad unit, multiple polymer layers with specific organic compounds, a rigid layer, and a panel light-emitting unit, along with a method of fabrication that involves precise layering and adhesive forces to manage stress and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid structure is used to improve display quality and durability, then the display quality and durability are improved, but the flexibility and ability to switch between folded and unfolded states deteriorates
Solution Approach 1:
The display device is divided into multiple functional layers including a flexible substrate, polymer layers with specific organic compounds, and rigid layers. This segmentation allows each layer to perform its specific function - the flexible substrate maintains flexibility while the rigid layers provide structural support and durability, resolving the contradiction between flexibility and durability.
Solution Approach 2:
The patent employs composite material structures combining flexible polymers with rigid layers. The polymer layers contain specific repeated subunits that provide both flexibility and mechanical strength, while the rigid layers provide structural support. This composite approach enables the display to achieve both flexibility for folding and rigidity for durability.
2Reliability
If multiple polymer layers with specific organic compounds are used to improve thermal and mechanical properties, then the thermal and mechanical properties are improved, but the manufacturing complexity increases
Solution Approach 1:
The polymer layers are prepared with pre-defined repeated subunit structures before assembly. The specific organic compounds are pre-synthesized with desired thermal and mechanical properties, allowing the manufacturing process to focus on layer assembly rather than creating complex molecular structures during fabrication, thus reducing manufacturing complexity.
Solution Approach 2:
The patent optimizes parameters such as the chemical structure of repeated subunits, layer thickness, and composition ratios to achieve desired thermal and mechanical properties. By systematically adjusting these parameters rather than using complex unpredictable material combinations, the manufacturing process becomes more controllable and less complex.
3Stability of the object's composition
If adhesive forces are increased to maintain layer stability during folding, then the layer stability is improved, but the risk of damage during state switching increases
Solution Approach 1:
Different regions of the display device have different adhesive properties. The adhesive layers are strategically positioned at specific interfaces where layer stability is most needed during folding, while other regions maintain lower adhesive forces to allow for stress accommodation. This local differentiation maintains layer stability without creating excessive stress concentration that could cause damage.
Solution Approach 2:
The polymer layers are designed with inherent cushioning properties through their molecular structure and composition. These layers can absorb and dissipate stress before it reaches critical interfaces, preventing damage during state switching while maintaining adequate layer stability through the cushioning effect.
Data Source
AI summary
A display device including a lower electrode layer including a first lower electrode having first and second areas and a second lower electrode having third and fourth areas, a pixel defining layer disposed on the lower electrode layer, a first electroluminescent layer disposed on the pixel defining layer and the first area and having an outline substantially surrounding an outline of the first area when viewed from the top, a second electroluminescent layer disposed on the pixel defining layer and the third area and having an outline substantially surrounding an outline of the third area when viewed from a top, an upper electrode disposed on the first and second electroluminescent layers and having an outline substantially surrounding the outlines of the first and second electroluminescent layers when viewed from the top, and a color filter layer.