Anti-Reflection Film With Localized Low Refractive Index Layer
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Solution Overview
Problem
Current anti-reflection films for displays, particularly LCDs, face challenges in achieving low production costs while maintaining excellent anti-reflection properties and preventing interference fringes, with existing methods being inefficient and costly due to the need for separate formation of hard coat and low refractive index layers.
Innovation Solution
An anti-reflection film with a low refractive index hard coat layer formed by curing an ionizing radiation curable material, incorporating a mixed layer and a localized layer with conductive particles, which blends with the transparent substrate to create a gradient, reducing the need for separate layers and minimizing refractive index differences, thus preventing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hard coat layer and low refractive index layer are formed separately using conventional methods, then each layer can be optimized for its specific function, but production costs increase and manufacturing complexity increases
Solution Approach 1:
The patent combines the hard coat layer and low refractive index layer into a single integrated layer formed by one wet coating process. The coating liquid contains both the binder resin (forming hard coat upon curing) and low refractive index particles (providing anti-reflection), eliminating the need for separate formation processes while achieving both functions simultaneously.
Solution Approach 2:
The single layer serves multiple functions: it provides surface hardness and abrasion resistance through the cured binder resin (hard coat function), while simultaneously providing anti-reflection properties through the low refractive index particles dispersed in the matrix. This multi-functional layer reduces manufacturing steps and costs.
2Reliability
If a multilayer anti-reflection structure is formed with separate hard coat and low refractive index layers, then excellent anti-reflection properties can be achieved, but production time increases and productivity decreases
Solution Approach 1:
The patent merges the formation of hard coat layer and low refractive index layer into a single wet coating and curing process. The coating liquid is applied once, then cured to form an integrated layer that provides both hard coat and anti-reflection functions simultaneously, eliminating multiple deposition steps and reducing production time.
3Productivity
If conventional wet coating methods are used to form anti-reflection layers, then production costs are reduced and productivity is improved, but interference fringes appear and anti-reflection properties deteriorate
Solution Approach 1:
The patent creates a layered structure within the single low refractive index hard coat layer: a mixed layer near the transparent substrate where binder resin and substrate components blend with a gradient, and a localized layer at the surface with concentrated low refractive index particles. This local differentiation optimizes both anti-reflection performance and eliminates interference fringes while maintaining cost-effective wet coating production.
Solution Approach 2:
The low refractive index hard coat layer is a composite material combining binder resin (for hard coat properties) and low refractive index particles (for anti-reflection). This composite structure within a single layer achieves both functional requirements while avoiding the interference fringes associated with conventional separate-layer approaches.
4Reliability
If excessive conductive particles are used in the low refractive index layer, then anti-reflection properties improve, but production costs increase and visible light transmittance decreases
Solution Approach 1:
The patent concentrates low refractive index particles primarily in the localized layer at the surface of the low refractive index hard coat layer, rather than uniformly distributing them throughout. This localized concentration achieves effective anti-reflection properties with reduced overall particle usage, maintaining visible light transmittance while lowering material costs.
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 excellent anti-reflection properties at a lower production cost, reducing the usage of conductive particles and saving time and resources, while preventing interference fringes and maintaining high visible light transmittance.
Implementation Method 1
a binder matrix which can be formed by curing an ionizing radiation curable material
Implementation Method 2
the low refractive index hard coat layer including low refractive index particles and a binder matrix which can be formed by curing an ionizing radiation curable material
Data Source
AI summary
The present invention provides an anti-reflection film which has excellent optical properties at a low production cost. The anti-reflection film of the present invention has a low refractive index hard coat layer having low refractive index particles and a binder matrix which is formed by curing an ionizing radiation curable material on a transparent substrate. It is a feature of the anti-reflection film of the present invention that the low refractive index hard coat layer has two optically distinguishable layers from the transparent substrate side, namely, an intermediate layer and a localized layer wherein the low refractive index particles are localized, and the refractive index and optical thickness of the localized layer are in the range of 1.29-1.43 and in the range of 100-200 nm, respectively.