Foldable Display Impact-Resistance Layer With Dual-Modulus Sub-Layers
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Solution Overview
Problem
Display devices, particularly outward-folding displays, are susceptible to damage from external impacts due to insufficient impact resistance, which compromises their service life and durability.
Innovation Solution
A display device with an impact-resistance layer comprising at least two sub-layers bonded by an adhesive layer, where the elastic modulus ratio of the first sub-layer to the second sub-layer is 20 to 300, and the materials of the sub-layers differ, allowing for efficient absorption and reflection of stress waves to protect the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single-layer protective cover is used, then the device structure is simple, but the impact resistance is insufficient
Solution Approach 1:
The protective cover is divided into multiple sub-layers with different elastic moduli (first sub-layer with higher elastic modulus, second sub-layer with lower elastic modulus). This segmentation allows each layer to perform specific functions: the first layer reflects stress waves while the second layer absorbs impact energy, thereby improving overall impact resistance without requiring a completely complex structure.
Solution Approach 2:
The patent uses composite material structure by combining materials with different elastic moduli in the protective cover. The first sub-layer uses material with higher elastic modulus (e.g., rigid polymer) and the second sub-layer uses material with lower elastic modulus (e.g., flexible polymer), creating a composite structure that optimizes both strength and flexibility for better impact protection.
2Strength
If the protective cover is made thicker to improve impact resistance, then the impact resistance increases, but the device thickness increases
Solution Approach 1:
Instead of uniformly increasing the thickness of the entire protective cover, the patent applies local quality by creating sub-layers with different elastic moduli at specific positions. The first sub-layer (closer to the impact point) has higher elastic modulus for immediate stress reflection, while the second sub-layer has lower elastic modulus for energy absorption, achieving effective impact protection with optimized local material properties rather than uniform thickness increase.
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 dual-layer structure effectively dissipates impact energy, reducing stress waves and prolonging the service life of the display device while maintaining flexibility and thinness, suitable for folding applications.
Implementation Method 1
the impact-resistance layer includes at least two sub-layers, two adjacent sub-layers of the sub-layers are bonded by an adhesive layer, the at least two sub-layers include a first sub-layer and a second sub-layer located on one side of the first sub-layer close to the display panel, the ratio of an elastic modulus of the first sub-layer to an elastic modulus of the second sub-layer is 20 to 300
Implementation Method 2
the ratio of an elastic modulus of the first sub-layer to an elastic modulus of the second sub-layer is 20 to 300, and a material of the first sub-layer is different from a material of the second sub-layer
Data Source
AI summary
The present application provides a display device. The display device includes a display panel and an impact-resistance layer. The impact-resistance layer includes at least two sub-layers, two adjacent sub-layers of the sub-layers are bonded by an adhesive layer, the at least two sub-layers includes a first sub-layer and a second sub-layer between the first sub-layer and the display panel, the ratio of the elastic modulus of the first sub-layer to the elastic modulus of the second sub-layer is 20 to 300, and the material of the first sub-layer is different from the material of the second sub-layer.