High-Refractive Adhesive Layer for Foldable Display Durability
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Solution Overview
Problem
Existing foldable display devices face challenges in achieving both flexibility and durability due to the limitations of adhesive layers, which are crucial for maintaining structural integrity and functionality during folding and unfolding.
Innovation Solution
A display device incorporating a high refractive adhesive layer with specific compositions, including inorganic particles and monomers, provides enhanced flexibility and durability, allowing for seamless folding and unfolding without compromising performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesive layers are used in foldable display devices, then the device can maintain basic structural integrity, but the adhesive layer lacks sufficient flexibility and durability during folding and unfolding
Solution Approach 1:
The adhesive layer uses a composite material system comprising aromatic monomers (40-80 wt%), aliphatic monomers (10-30 wt%), xylene resin (10-25 wt%), sulfide aromatic compounds (10-20 wt%), and inorganic particles (1-3 wt%). This composite formulation combines the flexibility of aromatic and aliphatic monomers with the durability enhancement from xylene resin and sulfide aromatic compounds, while inorganic particles provide additional structural stability during folding operations.
Solution Approach 2:
The adhesive layer's composition parameters are precisely controlled to achieve optimal performance: aromatic monomer content (40-80 wt%) provides flexibility, aliphatic monomer content (10-30 wt%) enhances durability, xylene resin (10-25 wt%) and sulfide aromatic compounds (10-20 wt%) improve structural integrity, and inorganic particle content (1-3 wt%) stabilizes the adhesive during folding. These parameter optimizations resolve the contradiction between flexibility and durability.
2Adaptability or versatility
If the adhesive layer is made more flexible to accommodate folding, then folding capability improves, but structural integrity and durability during folding deteriorate
Solution Approach 1:
The adhesive layer employs a multi-component composite system where aromatic monomers (40-80 wt%) provide the necessary flexibility for folding, while aliphatic monomers (10-30 wt%), xylene resin (10-25 wt%), and sulfide aromatic compounds (10-20 wt%) contribute to structural integrity and durability. The synergistic combination ensures both folding capability and structural strength are achieved simultaneously.
Solution Approach 2:
By optimizing the compositional parameters within specific ranges, the adhesive layer achieves the desired balance: aromatic monomer content is controlled at 40-80 wt% for flexibility, aliphatic monomer at 10-30 wt% for durability, xylene resin at 10-25 wt% for structural integrity, and sulfide aromatic compounds at 10-20 wt% for enhanced strength. This parameter optimization enables the adhesive to withstand folding while maintaining structural integrity.
3Illumination intensity
If inorganic particles are added to increase refractive index, then optical performance improves, but adhesive layer flexibility and durability may be compromised
Solution Approach 1:
The inorganic particle content is precisely controlled at 1-3 wt% to achieve the desired refractive index enhancement without compromising adhesive durability. This optimized concentration range ensures sufficient optical performance while maintaining the flexibility and durability provided by the organic polymer matrix (aromatic monomers, aliphatic monomers, xylene resin, and sulfide aromatic compounds).
Solution Approach 2:
The inorganic particles are dispersed throughout the adhesive layer matrix, creating a homogeneous composite material. The local distribution of particles (1-3 wt%) provides uniform refractive index enhancement across the adhesive layer while maintaining consistent mechanical properties and durability throughout the entire adhesive structure.
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 high refractive adhesive layer ensures excellent flexibility and durability, enabling the display device to maintain structural integrity and functionality, enhancing user convenience and longevity.
Implementation Method 1
a high refractive adhesive layer disposed on the low refractive pattern and the display panel and including inorganic particles... the low refractive pattern may have a refractive index in a range of about 1.45 to about 1.55, and the high refractive adhesive layer may have a refractive index in a range of about 1.55 to about 1.65
Data Source
AI summary
A display device includes a display panel including a light emitting element, a low refractive pattern disposed on the display panel and including an opening overlapping the light emitting element in a thickness direction of the display panel, and a high refractive adhesive layer disposed on the low refractive pattern and the display panel and including inorganic particles. The high refractive adhesive layer includes 1 wt % to 3 wt % of the inorganic particles based on a total weight of the high refractive adhesive layer.