Dual-Layer Display Adhesive for Impact Resistance and Low Reflection
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Solution Overview
Problem
Existing flexible display devices face challenges with impact resistance and external light reflection, which affect their durability and image quality.
Innovation Solution
A display device design incorporating a dual-layer adhesive structure with differing moduli and refractive indices, comprising a first sub-adhesive layer with a low modulus and a second sub-adhesive layer with a high modulus, along with specific materials like fluorene-based compounds and TiO2 nanocomposites, to enhance impact resistance and reduce light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single adhesive layer is used between the window and protective layer, then the device structure is simple, but the impact resistance is insufficient
Solution Approach 1:
The adhesive layer is divided into two sub-layers: a first sub-adhesive layer with low modulus (0.1 MPa or less) for flexibility and bending, and a second sub-adhesive layer with high modulus (100 MPa or more) for impact resistance. This segmentation allows each sub-layer to perform its specific function optimally.
Solution Approach 2:
Different regions of the adhesive layer have different mechanical properties. The first sub-adhesive layer provides flexibility and cushioning where needed, while the second sub-adhesive layer provides rigidity and impact resistance where needed. This local differentiation of properties resolves the contradiction between flexibility and impact resistance.
2Object-affected harmful factors
If a single adhesive layer with uniform refractive index is used, then the manufacturing is simple, but external light reflection is not reduced
Solution Approach 1:
The adhesive layer is segmented into two sub-layers with different refractive indices. The first sub-adhesive layer has a first refractive index and the second sub-adhesive layer has a second refractive index, creating an optical gradient that reduces light reflection through progressive refractive index transition.
Solution Approach 2:
Different portions of the adhesive layer have different optical properties (refractive indices). This local differentiation in optical properties allows the structure to reduce external light reflection by minimizing abrupt refractive index changes at interfaces.
3Strength
If the adhesive layer is made thicker to improve impact resistance, then the impact resistance improves, but the flexibility and bending performance deteriorate
Solution Approach 1:
The adhesive layer is segmented into a first sub-adhesive layer with low modulus for flexibility and a second sub-adhesive layer with high modulus for impact resistance. This segmentation allows the overall structure to achieve both flexibility and impact resistance simultaneously.
Solution Approach 2:
The first sub-adhesive layer provides flexibility and cushioning in regions where bending occurs, while the second sub-adhesive layer provides impact resistance in regions where protection is needed. This local differentiation allows the adhesive layer to be thin overall while maintaining both flexibility and impact resistance.
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 provides improved durability against external impacts and reduces external light reflection, resulting in a more robust and high-quality display experience.
Implementation Method 1
a first sub-adhesive layer having a first modulus; and a second sub-adhesive layer disposed on the first sub-adhesive layer and having a second modulus, wherein the second modulus of the second sub-adhesive layer is greater than the first modulus of the first sub-adhesive layer
Implementation Method 2
improved durability against external impact
Implementation Method 3
The first sub-adhesive layer and the second sub-adhesive layer may have the second refractive index. The first sub-adhesive layer and the second sub-adhesive layer may have the first refractive index.
Data Source
AI summary
Provided is a display device including: a display panel; a protective layer disposed on the display panel; a window disposed on the protective layer; and an adhesive layer disposed between the window and the protective layer, wherein the adhesive layer includes: a first sub-adhesive layer having a first modulus; and a second sub-adhesive layer disposed on the first sub-adhesive layer and having a second modulus, and the second modulus of the second sub-adhesive layer is greater than the first modulus of the first sub-adhesive layer.