Low Refractive Index Layer Hardness via Composite Binder
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Solution Overview
Problem
Conventional optical layered bodies with low refractive index layers, such as those containing hollow silica fine particles, fail to provide sufficient antireflection properties and hardness, leading to suboptimal display quality in image display devices.
Innovation Solution
An optical layered body comprising a low refractive index layer formed with a composition containing hollow silica fine particles, a fluorine atom-free polyfunctional monomer, a fluorine atom-containing monomer, and a fluorine atom-containing polymer, which improves refractive index reduction while maintaining layer strength and surface evenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a low refractive index layer containing hollow silica fine particles is provided on the outermost surface, then the refractive index is reduced for antireflection purposes, but the hardness becomes insufficient and the surface becomes uneven
Solution Approach 1:
The patent uses a composite binder system combining fluorine atom-containing polymer with fluorine atom-free polyfunctional monomer and fluorine atom-containing monomer. This composite approach allows the binder to achieve both low refractive index (through fluorine atoms) and sufficient hardness (through crosslinking reactions of polyfunctional monomers), resolving the contradiction between antireflection properties and hardness
Solution Approach 2:
The patent adjusts the chemical composition parameters of the binder by incorporating specific ratios of fluorine-containing and fluorine-free components. This parameter optimization enables the binder to simultaneously achieve the desired low refractive index while maintaining adequate hardness and surface evenness through controlled crosslinking density
2Illumination intensity
If fluorine atom-containing polymer or monomer is blended in the binder to reduce refractive index, then the refractive index is sufficiently reduced, but the hardness becomes insufficient and cissing arises
Solution Approach 1:
The patent applies local quality by differentiating the functions of various binder components: fluorine atom-containing polymer provides low refractive index, while fluorine atom-free polyfunctional monomer provides crosslinking density for hardness. Each component is strategically positioned to fulfill its specific function, preventing both cissing and insufficient hardness
Solution Approach 2:
The patent creates a composite binder system where fluorine atom-containing polymer is combined with fluorine atom-free polyfunctional monomer and fluorine atom-containing monomer. This composite structure allows the binder to achieve both low refractive index (from fluorine atoms) and sufficient hardness (from crosslinking), eliminating the cissing problem while maintaining antireflection properties
3Device complexity
If conventional low refractive index layer is used, then the structure is simple, but the antireflection properties are insufficient for high display quality
Solution Approach 1:
The patent optimizes the optical parameters of the low refractive index layer by using a binder with specifically controlled fluorine content and crosslinking density. This parameter optimization achieves superior antireflection properties (lower reflectance) while maintaining a simple single-layer structure, satisfying high display quality requirements
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 antireflection properties and sufficient hardness, enhancing the display quality of image display devices by reducing reflectance and maintaining a low refractive index.
Implementation Method 1
a low refractive index layer having a refractive index lower than that of a light-transmitting substrate is provided on the outermost surface
Implementation Method 2
the organic binder containing: a fluorine atom-free polyfunctional monomer having three or more reactive functional groups in one molecule; a fluorine atom-containing monomer; and a fluorine atom-containing polymer
Data Source
AI summary
The present invention has its object to provide an optical layered body having sufficient hardness and an even surface, including a low refractive index layer having a sufficiently low refractive index, and having excellent antireflection properties. optical layered body of the present invention comprises: at least a low refractive index layer on a light-transmitting substrate, wherein said low refractive index layer is formed by using a composition for a low refractive index layer, said composition comprising a hollow silica fine particle and an organic binder, said organic binder containing: a fluorine atom-free polyfunctional monomer having three or more reactive functional groups in one molecule; a fluorine atom-containing monomer; and a fluorine atom-containing polymer.