Flexible Screen Cover Layer Stack for Impact Wave Attenuation
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Solution Overview
Problem
Flexible screens made of organic polymer materials have poor impact resistance due to their lower strength compared to conventional screens, leading to increased risk of damage.
Innovation Solution
A flexible screen cover with a stacked structure of protective, main, and buffer layers, where the main layer is made of a high-modulus material and the buffer layer is made of a low-modulus material, with a specific modulus ratio to enhance impact resistance by reflecting and attenuating stress waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible organic polymer material is used for the screen, then flexibility and bendability are improved, but impact resistance performance deteriorates
Solution Approach 1:
The screen cover is divided into three distinct layers with different modulus values: a protective layer (high modulus), a main layer (intermediate modulus), and a buffer layer (low modulus). This segmentation allows each layer to perform its specific function - the buffer layer absorbs impact energy, the main layer maintains structural integrity, and the protective layer provides surface protection, thereby resolving the contradiction between flexibility and impact resistance.
Solution Approach 2:
The invention uses a composite structure combining materials with different mechanical properties. The buffer layer uses low-modulus material for energy absorption, the main layer uses high-modulus material for structural support, and the protective layer provides additional protection. This composite approach enables the screen to exhibit both flexibility and high impact resistance simultaneously.
2Strength
If a high-modulus material is used for the main layer, then deformation resistance is improved, but flexibility deteriorates
Solution Approach 1:
The screen cover is segmented into layers with progressively different modulus values. The buffer layer (low modulus) provides flexibility and absorbs stress, while the main layer (high modulus) provides deformation resistance. The protective layer (high modulus) provides surface protection. This segmentation allows the high-modulus main layer to maintain structural integrity without compromising overall flexibility, as the low-modulus buffer layer compensates for rigidity.
Solution Approach 2:
Different regions of the screen cover have different mechanical properties tailored to their specific functions. The buffer layer has low modulus for flexibility and stress absorption, the main layer has high modulus for structural support and deformation resistance, and the protective layer has high modulus for surface protection. This local differentiation of material properties resolves the contradiction between deformation resistance and flexibility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively reduces the impact energy transmitted to the flexible display panel, improving the impact resistance and reducing the risk of damage to the flexible screen and display panel.
Implementation Method 1
a wave impedance difference between the main layer and the buffer layer is quite large... a stress wave generated by the transient impact can be adequately reflected in the interface between the main layer and the buffer layer
Implementation Method 2
deformation of the buffer layer falls within a proper range and is not excessive, so that a relatively stable interface can be maintained between the buffer layer and the main layer. Therefore, a stress wave generated by the transient impact can be adequately reflected
Data Source
AI summary
This application provides a flexible screen cover. The flexible screen cover includes a protective layer, a main layer, and a buffer layer. A modulus ratio of the main layer to the buffer layer is 8 to 180000. The buffer layer can be disposed at any proper position in the flexible screen. A modulus ratio of an adjacent layer to a buffer layer is 2 to 500000. The collapsible electronic device includes a housing and a flexible screen, and the flexible screen is installed in the housing. This application can improve impact resistance performance of the flexible screen.