Optical Film Single Coating Antireflection Scratch Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current antireflection films for image display devices face challenges in achieving high scratch resistance and productivity while maintaining low refractive index and antireflection properties, often requiring multiple coating steps and compromising on coating strength and adhesion.
Innovation Solution
An optical film with a transparent support and an optical functional layer containing low refractive index fine particles arranged in a line on the surface and high refractive index fine particles unevenly distributed below, using a fluorine-containing compound, which allows for single coating and enhanced scratch resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple optical functional layers are stacked to achieve higher antireflection properties, then antireflection performance is improved, but productivity is remarkably lowered and coating cost increases
Solution Approach 1:
The patent combines multiple optical functional layers (low refractive index layer and high refractive index layer) into a single integrated optical functional layer. This is achieved by using a binder resin composition containing both low refractive index fine particles (e.g., hollow silica particles) and high refractive index fine particles (e.g., metal oxide particles), allowing both layers to be formed simultaneously in one coating process, thus eliminating the need for repeated coating, drying, and curing steps.
Solution Approach 2:
The patent employs a composite binder resin composition that integrates materials with different refractive indices. The composition includes low refractive index fine particles (refractive index ≤1.45), high refractive index fine particles (refractive index ≥1.60), and a binder resin, creating a single-layer composite structure that functions as both the low refractive index layer and high refractive index layer, thereby achieving antireflection properties of multiple layers while maintaining high productivity.
2Object-affected harmful factors
If fluorine atoms or inorganic fine particles with hollow structure are introduced to reduce refractive index, then antireflection properties are improved, but coating strength and adhesion are impaired and scratch resistance is lowered
Solution Approach 1:
The patent applies local quality by creating distinct regions within the optical functional layer with different refractive indices. The low refractive index fine particles are concentrated in specific areas to reduce overall reflectance, while the high refractive index fine particles are distributed to provide structural reinforcement. This localized distribution allows the layer to simultaneously achieve low reflectance and high scratch resistance.
Solution Approach 2:
The patent uses a composite material system combining low refractive index fine particles (for antireflection), high refractive index fine particles (for strength and adhesion), and a binder resin (for cohesion). This composite structure allows the low refractive index particles to provide antireflection properties while the high refractive index particles and binder resin maintain coating strength and scratch resistance, resolving the contradiction between reducing refractive index and maintaining mechanical strength.
3Object-affected harmful factors
If low refractive index fine particles are densely packed to achieve low refractive index, then antireflection properties are improved, but coating strength is compromised
Solution Approach 1:
The patent implements local quality by creating a non-uniform distribution of fine particles within the optical functional layer. Low refractive index fine particles are densely packed in regions where antireflection is most needed, while high refractive index fine particles are distributed in regions where structural strength is critical. This spatial differentiation allows the coating to achieve both low reflectance and adequate strength without requiring uniform dense packing throughout the entire layer.
Solution Approach 2:
The patent employs a composite material composition that balances low refractive index fine particles and high refractive index fine particles. The low refractive index particles provide the necessary antireflection properties through their hollow structure and low refractive index, while the high refractive index particles (such as metal oxide particles) provide structural reinforcement and adhesion. The binder resin binds these particles together, creating a cohesive layer that maintains coating strength despite the presence of numerous fine particles.
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 provides an antireflection film with improved scratch resistance and productivity, achieving high antireflection properties while maintaining physical strength, through a single coating process that enhances the distribution and arrangement of fine particles.
Implementation Method 1
the optical functional layer contains low refractive index fine particles having a refractive index of not more than 1.45, high refractive index fine particles having a refractive index of 1.55 or more
Data Source
AI summary
An optical film, includes: a transparent support; and an optical functional layer as the outermost layer of the optical film, the optical functional layer being provided on or above the transparent support, wherein the optical functional layer has a thickness of 50 nm or more and not more than 250 nm; the optical functional layer contains low refractive index fine particles having a refractive index of not more than 1.45, high refractive index fine particles having a refractive index of 1.55 or more, and a fluorine-containing compound; the low refractive index fine particles are arranged substantially in a line on a surface of the optical functional layer on the opposite side of the transparent support; and the high refractive index fine particles are unevenly distributed in a lower part of the optical functional layer on the side of the transparent support.