Antireflection Layer Moth Eye Structure Suppresses Blue Tint
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Solution Overview
Problem
Antireflection films with a moth eye structure used in image display devices suffer from blue tint generation during black display or in dark environments due to wavelength-dependent reflectance, and existing solutions struggle to balance low reflectance with particle aggregation and increased reflectance at low particle occupancy ratios.
Innovation Solution
An antireflection article featuring a substrate with an antireflection layer containing mono-disperse, perfectly spherical inorganic particles with a primary particle diameter of 150 nm to 250 nm, a CV value of 4% or less, and an area occupancy ratio of 25% to 64%, forming a moth eye structure to reduce reflectance and prevent blue tint generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the area occupancy ratio of inorganic particles is decreased to suppress blue tint, then blue tint is reduced, but particle aggregation occurs and reflectance increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the area occupancy ratio of inorganic particles within the specific range of 25% to 64%. This parameter optimization resolves the contradiction by finding the optimal balance point where blue tint is suppressed while maintaining low reflectance, avoiding both the aggregation problem at low ratios and the blue tint problem at high ratios
Solution Approach 2:
The patent applies local quality by creating a non-uniform distribution pattern where particles are spaced at specific intervals (average distance of 30 nm or more) rather than being uniformly distributed. This local spacing control prevents aggregation while maintaining adequate coverage, resolving the contradiction between low occupancy ratio and preventing aggregation
2Object-generated harmful factors
If the area occupancy ratio of inorganic particles is increased to maintain low reflectance, then reflectance is reduced, but blue tint is generated
Solution Approach 1:
The patent applies parameter changes by establishing the upper limit of the area occupancy ratio at 64%. This parameter control prevents excessive particle density that would cause blue tint while maintaining sufficient particle coverage to keep reflectance low, thus resolving the contradiction between these two opposing requirements
3Ease of manufacture
If non-spherical particles are used, then manufacturing is easier, but aggregation occurs and reflectance increases
Solution Approach 1:
The patent applies spheroidality by requiring that 99.9% or more of inorganic particles be perfectly spherical. This shape requirement prevents particle aggregation and maintains low reflectance, while the high spherical purity threshold ensures that the manufacturing complexity remains acceptable by focusing on achieving near-perfect sphericity rather than complex non-spherical shapes
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 effectively suppresses blue tint and maintains low reflectance by optimizing particle size, shape, and distribution, enhancing the antireflection properties of the film without increasing haze or reflectance.
Implementation Method 1
a refractive index gradient layer in which a refractive index is continuously varied from air toward a bulk material at an inside of the substrate is artificially formed, so that light may be prevented from being reflected
Data Source
AI summary
An antireflection article includes a substrate; and an antireflection layer containing a binder resin and inorganic particles, wherein the inorganic particles are particles having an average primary particle diameter of 150 nm to 250 nm and a CV value of 4% or less, 99.9% or more of the inorganic particles are perfectly spherical particles, the antireflection layer includes a moth eye structure composed of an unevenness shape formed by the inorganic particles on a surface of the antireflection layer, and an area occupancy ratio of the inorganic particles on the surface of the antireflection layer is 25% to 64%.