Flexible Display Composite Support for Bendability and Impact Resistance
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Solution Overview
Problem
Existing flexible display technologies face challenges in maintaining rigidity and impact resistance, particularly in outward-bendable designs, where the flexible cover plate is exposed and requires high shock resistance, while also ensuring flexibility and a small bending radius.
Innovation Solution
A composite structure comprising organic and inorganic material layers is introduced between the flexible cover plate and the display device, with specific thickness ratios and configurations to enhance support and hardness, including a connection layer and a second support layer with stainless steel, and a hard coating for improved impact resistance and pencil hardness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a flexible cover plate is used in outward-bendable display, then the display surface can be bent outwards and the whole machine appears elegant and beautiful, but the requirements on rigidity and shock resistance become relatively high to prevent scratching or impact damage
Solution Approach 1:
The patent applies composite materials by combining an inorganic material layer (such as SiNx or SiOx) with an organic material layer (such as acrylic resin, epoxy resin, or polyimide) to form a composite film layer. This composite structure provides both the flexibility needed for outward bending and the enhanced shock resistance and rigidity required to protect the display module, resolving the contradiction between bendability and strength.
2Strength
If the inorganic material layer thickness is increased to improve hardness and scratch resistance, then the pencil hardness improves, but the flexibility and bendability of the flexible cover plate deteriorate
Solution Approach 1:
The patent uses composite materials where a thin inorganic material layer (50-200 nm) provides hardness and scratch resistance, while an organic material layer (1-10 μm) maintains flexibility. The synergistic combination allows the cover plate to achieve high pencil hardness without sacrificing the flexibility needed for bendable displays.
Solution Approach 2:
The patent applies local quality by providing different material properties in different layers: the inorganic layer provides localized hardness and scratch resistance where needed, while the organic layer provides flexibility in the regions requiring bendability. This layered approach with differentiated local properties resolves the contradiction between hardness and flexibility.
3Strength
If a single thick inorganic material layer is used to provide support, then the impact resistance improves, but the manufacturing complexity and risk of dislocation increase
Solution Approach 1:
The patent applies segmentation by dividing the support structure into multiple thin layers (inorganic layer + organic layer) rather than using a single thick layer. This segmented multi-layer structure reduces internal stress and the risk of dislocation during manufacturing and bending, while still providing adequate impact resistance through the combined structure.
Solution Approach 2:
The composite material structure distributes stress across multiple interfaces between layers, reducing the likelihood of dislocation compared to a single thick layer. The alternating inorganic and organic layers create a more manageable structure that is easier to manufacture with lower defect rates while maintaining impact resistance.
Data Source
AI summary
The present disclosure provides a flexible display apparatus and a method for manufacturing the same. The flexible display apparatus includes a display device and a flexible cover plate disposed on a light emergent side of the display device; a first support layer is provided between the flexible cover plate and the display device, the first support layer includes at least one organic material layer and at least one inorganic material layer. The flexible display apparatus and the method for manufacturing the same can improve the pencil hardness of the whole module to a certain extent.