Layered Optical Body Hardness and Folding Durability
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Solution Overview
Problem
Conventional optical films face a trade-off between hardness and folding-durable performance, where improving one characteristic compromises the other, and existing materials like glass and polyimide films fail to provide excellent transparency and strength simultaneously.
Innovation Solution
A layered body for an optical member comprising a substrate film, such as polyimide or aramid film, with a cured resin layer and an eluting layer, which includes a monofunctional monomer and reactive silica fine particles, providing a hardness of 4H or higher and maintaining transparency and folding durability through repeated 180-degree folds without cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the hardness of optical films is improved, then the folding-durable performance is decreased
Solution Approach 1:
The optical film is divided into multiple layers: a substrate film and at least one cured resin layer. The substrate film provides flexibility and folding durability, while the cured resin layer provides hardness and scratch resistance. This segmentation allows each layer to optimize for its specific function without compromising the other.
Solution Approach 2:
The patent uses composite material structure combining different materials with complementary properties. The substrate film (e.g., polyimide or aramid) provides mechanical flexibility and folding durability, while the cured resin layer (containing monofunctional monomer and reactive silica fine particles) provides hardness. The combination creates a material system that exhibits both high hardness and excellent folding durability simultaneously.
2Strength
If glass substrate is used to improve hardness, then folding properties cannot be imparted
Solution Approach 1:
The patent separates the functions of hardness and flexibility into different layers. The substrate film is specifically chosen to be flexible and foldable, while the cured resin layer is applied to provide the hardness that glass would normally provide. This segmentation eliminates the need for rigid glass substrates while maintaining scratch resistance.
Solution Approach 2:
The patent changes the material parameters from rigid glass to flexible polymer substrates (polyimide or aramid films). This parameter change in substrate material allows the optical film to be flexible and foldable, while the hardness requirement is met through the cured resin layer with monofunctional monomer and reactive silica fine particles.
3Weight of moving object
If glass thickness is decreased to reduce weight, then strength is reduced making it easily broken
Solution Approach 1:
The patent changes the fundamental material parameter from glass to flexible polymer substrate. This allows the use of thin films (reducing weight) while maintaining strength through the flexible substrate's inherent properties and the protective cured resin layer, eliminating the trade-off between thickness and strength that exists with glass.
4Strength
If polyimide film is used as substrate to improve mechanical strength, then transparency is reduced
Solution Approach 1:
The patent changes the substrate material from conventional polyimide to transparent polyimide or aramid films. This parameter change maintains the excellent mechanical strength and folding durability of polyimide while improving transparency for optical applications. The cured resin layer is also optimized to maintain high transparency.
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 solution achieves excellent hardness, transparency, and folding durability, allowing the layered body to withstand 100,000 repeated folds without fracture and maintaining anti-interference fringe performance with low spectral reflectivity standard deviation.
Implementation Method 1
a cured resin layer, which includes a monofunctional monomer and reactive silica fine particles
Implementation Method 2
the layered body being not cracked or fractured when a test in which the entire area of the layered body for an optical member is folded 180 degrees at 20 mm intervals is repeated 100,000 times
Data Source
AI summary
The present invention provides a layered body for organic electroluminescence which is excellent in the hardness, the transparency and the folding-durable performance.The present invention is a layered body for organic electroluminescence in which an optical layered body is laminated on one surface of an organic electroluminescence layer and which is not cracked or fractured when a test in which the entire area of the layered body for organic electroluminescence is folded 180 degrees at 20 mm intervals is repeated 100,000 times.