Flexible Display Strengthening Layer Stress Reduction
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Solution Overview
Problem
The challenge in flexible display modules is to enhance the reliability while maintaining the bending characteristics, as the protective layer's thickness affects both protection and flexibility, leading to potential OLED device failures during bending tests.
Innovation Solution
A strengthening layer with a modulus greater than or equal to the other layers is introduced between the display layer and the protective layer, reducing stress on the display layer and enhancing bending characteristics, and can be made of materials like soft glass or inorganic fiber-reinforced organic materials, with a thickness ranging from 10 μm to 150 μm and a transmittance greater than 90%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the protective layer is increased to improve protection characteristics of the OLED device, then the reliability is improved, but the bending characteristics of the flexible display module are affected
Solution Approach 1:
The protective structure is segmented into multiple functional layers: a flexible protective layer for basic protection and flexibility, and a separate strengthening layer with higher modulus for enhanced protection. This segmentation allows each layer to perform its specific function without compromising the other, resolving the contradiction between protection and bending characteristics.
Solution Approach 2:
The flexible display module uses a composite multi-layer structure combining materials with different mechanical properties. The protective layer uses flexible material for bending, while the strengthening layer uses high-modulus material for protection. This composite approach enables the system to achieve both flexibility and strength simultaneously.
2Adaptability or versatility
If the thickness of the protective layer is limited to maintain bending characteristics, then the flexibility is improved, but the protective properties of the protective layer are affected
Solution Approach 1:
The protective function is segmented between two layers: the protective layer maintains thinness for flexibility, while the strengthening layer provides the necessary protection. This functional segmentation resolves the contradiction by distributing protection and flexibility requirements to different layers.
Solution Approach 2:
The strengthening layer acts as an intermediary element between the protective layer and the display layer. It mediates the mechanical stress during bending, protecting the display layer while allowing the protective layer to remain thin and flexible.
3Reliability
If a strengthening layer with high modulus is added to improve protection, then the reliability is improved, but the device complexity is increased
Solution Approach 1:
The strengthening layer serves multiple functions simultaneously: it provides mechanical protection, maintains bending characteristics by being positioned strategically, and can be integrated with existing manufacturing processes. This multi-functionality justifies the added layer by delivering multiple benefits from a single structural addition.
Data Source
AI summary
A flexible display module includes a flexible substrate, a display layer disposed on the flexible substrate, a protective layer disposed on the display layer, a strengthening layer disposed between the display layer and the protective layer, the modulus of the strengthening layer being greater than or equal to the modulus of any of the layers in the flexible display module.