Low Refractive Layer Anti-Reflective Film Alkali Resistance
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Solution Overview
Problem
Existing anti-reflective films for display devices face challenges in achieving excellent optical and mechanical properties while maintaining alkali resistance, leading to issues with scratch resistance and image quality, particularly when exposed to alkali treatments.
Innovation Solution
A low refractive layer with specific optical and mechanical properties is developed, characterized by a b* value change of Δb* ≤ 0.5 in the L*a*b* color coordinate system after alkali treatment, and a scratch resistance change of ΔS ≤ 30% using a photocurable coating composition containing polysilsesquioxane, fluorine-based compounds, and inorganic particles, ensuring minimal reflectance and high light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a multilayer structure with hard coating layer and low-reflection coating layer is formed, then anti-reflection performance is improved, but interlayer adhesion is weakened and scratch resistance is poor
Solution Approach 1:
The patent combines the hard coating layer and low-reflection coating layer into a single integrated layer that simultaneously provides both hardness/scratch resistance and anti-reflection properties. This is achieved by incorporating inorganic particles (such as silica or titania) with refractive index 1.3-1.7 into a polymer matrix, creating one layer that performs both functions rather than requiring separate layers.
Solution Approach 2:
The patent uses composite materials consisting of a polymer base material combined with inorganic particles. The polymer provides flexibility and adhesion, while the inorganic particles provide hardness, scratch resistance, and controlled refractive index for anti-reflection. This composite approach allows simultaneous achievement of mechanical strength and optical properties in a single layer.
2Strength
If inorganic additive is added to improve scratch resistance of polymer film, then scratch resistance is improved, but alkali resistance is greatly decreased
Solution Approach 1:
The patent carefully controls the refractive index parameter of the inorganic particles within the specific range of 1.3-1.7, and adjusts the particle size and concentration to optimize both scratch resistance and alkali resistance. By parameter optimization, the patent achieves a balance where inorganic particles provide mechanical strength without excessive compromise to chemical stability.
Solution Approach 2:
The patent creates local regions with different properties within the coating layer. The inorganic particles are dispersed throughout the polymer matrix, providing localized hardness and scratch resistance at particle locations, while the polymer continuous phase maintains overall alkali resistance. This spatial distribution allows simultaneous achievement of both properties.
3Illumination intensity
If AG coating with surface irregularities is applied, then light scattering is improved and reflection is reduced, but screen resolution degrades
Solution Approach 1:
Instead of creating surface irregularities in the traditional AG coating manner, the patent incorporates inorganic particles within the coating layer volume to achieve light scattering. This moves the scattering mechanism from surface topology to internal composition, maintaining surface flatness for high resolution while achieving reflection reduction through volumetric scattering centers.
Solution Approach 2:
The patent creates a composite structure with inorganic particles dispersed in the polymer matrix, forming a heterogeneous structure that scatters light. The particle-matrix interfaces act as scattering centers, providing anti-reflection effect without requiring surface roughness, thus preserving screen resolution.
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 low refractive layer exhibits excellent optical and mechanical properties, including high scratch resistance and alkali resistance, simplifying the production process, reducing costs, and enhancing productivity without degrading image quality, even under alkali treatment conditions.
Implementation Method 1
a low refractive layer... prepared by photo-curing a photocurable coating composition
Implementation Method 2
a method of utilizing an interference of light by forming a plurality of layers having refractive indexes different from each other on a substrate film (anti-reflection: AR coating)
Data Source
AI summary
The present invention relates to a low refractive layer and an anti-reflective film comprising the same. The low refractive layer can exhibit excellent optical properties such as a low reflectance and a high light transmittance, and excellent mechanical properties such as high wear resistance and scratch resistance at the same time, without adversely affecting the color of the polymer resin forming the low refractive layer. In particular, due to the excellent alkali resistance, the low refractive layer can maintain excellent physical properties even after alkali treatment. Therefore, when introducing a low refractive layer to the display device, it is expected that the production process can be simplified and further the production rate and the productivity can significantly increase.