Multi-Layer Adhesive Member for Display Impact Resistance
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Solution Overview
Problem
Display devices face challenges in achieving adequate impact resistance, particularly in diversified stacked structures and shapes, where existing adhesive members do not effectively prevent damage from external impacts.
Innovation Solution
A display device design incorporating an adhesive member with multiple layers, including a first adhesive layer with a low storage modulus adjacent to the display module and a second adhesive layer with a higher storage modulus, and optionally a third layer, to distribute modulus effectively and enhance impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single-layer adhesive member is used, then the device structure is simple, but the impact resistance is insufficient
Solution Approach 1:
The adhesive member is segmented into multiple layers with different storage moduli. The first adhesive layer (adjacent to display module) has a storage modulus of 150-350 KPa, the second adhesive layer has 8,500-25,000 KPa, and optionally a third layer has 150-350 KPa. This segmentation allows each layer to perform different functions in absorbing and distributing impact forces, thereby resolving the contradiction between simplicity and impact resistance.
Solution Approach 2:
The adhesive member uses a composite structure combining materials with different mechanical properties. By stacking adhesive layers with low storage modulus (150-350 KPa) and high storage modulus (8,500-25,000 KPa), the composite structure achieves superior impact resistance while maintaining flexibility, thus resolving the contradiction between strength improvement and structural complexity.
2Strength
If a high storage modulus adhesive is used throughout, then the adhesion strength is high, but the flexibility and folding characteristics are compromised
Solution Approach 1:
Different regions of the adhesive member have different storage moduli tailored to their specific functions. The first and third layers (adjacent to rigid components) have low storage modulus (150-350 KPa) to provide flexibility and absorb impact, while the second layer (middle region) has high storage modulus (8,500-25,000 KPa) to provide strong adhesion. This local differentiation resolves the contradiction between adhesion strength and folding characteristics.
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 multi-layer adhesive member structure significantly increases the impact resistance of the display device, allowing it to withstand external impacts without compromising flexibility, thus ensuring durability and folding characteristics.
Implementation Method 1
a first adhesive layer disposed adjacent to the display module and having a first storage modulus at −20° C.
Implementation Method 2
a second adhesive layer disposed directly on the first adhesive layer and having a second storage modulus at −20° C. The second storage modulus is greater than the first storage modulus.
Data Source
AI summary
A display device includes a display module. An adhesive member is disposed directly on the display module. A window is disposed directly on the adhesive member. The adhesive member includes a first adhesive layer disposed adjacent to the display module and having a first storage modulus at −20° C. A second adhesive layer is disposed directly on the first adhesive layer and has a second storage modulus at −20°° C. The second storage modulus is greater than the first storage modulus.