Multilayer Anti-Reflection Coating for Low Reflectivity and Hardness
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Solution Overview
Problem
Existing display devices face challenges in achieving both low reflectivity and high hardness for their anti-reflection layers, which are crucial for enhancing optical properties and durability.
Innovation Solution
The anti-reflection layer is designed with specific thicknesses and refractive indices for multiple layers, including substrate and surface high- and low-refractive layers, along with intermediate layers, to reduce reflectivity and improve hardness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional anti-reflection layer is used, then the reflectivity is reduced, but the hardness is insufficient
Solution Approach 1:
The anti-reflection layer is divided into multiple alternating high-refractive and low-refractive layers (first through fourth layers) with specific thickness ranges. This segmented multilayer structure enables independent optimization of optical properties (reflectivity reduction) and mechanical properties (hardness) by controlling the thickness and material composition of each individual layer, thereby resolving the contradiction between low reflectivity and high hardness.
Solution Approach 2:
The patent employs composite material construction by combining materials with different refractive indices and hardness characteristics in a multilayer configuration. The high-refractive layers and low-refractive layers use different material compositions that collectively provide both the desired optical performance (reflectivity of 0.8-0.9%) and enhanced mechanical hardness, overcoming the limitations of single-material anti-reflection coatings.
2Strength
If the thickness of anti-reflection layers is increased to improve hardness, then the optical properties deteriorate
Solution Approach 1:
Each layer in the multilayer structure is assigned specific thickness parameters within optimized ranges (e.g., first high-refractive layer: 5-70 nm, second low-refractive layer: 5-70 nm, third high-refractive layer: 100-180 nm, fourth low-refractive layer: 60-110 nm). This local quality control allows each layer to contribute differently to the overall performance, with thinner layers optimizing optical interference for reflectivity reduction and cumulative thickness providing hardness, thus resolving the thickness-related contradiction.
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 proposed anti-reflection layer achieves a reflectivity of 0.8-0.9% and significantly enhances the hardness, providing a high-hardness anti-reflection layer with excellent optical properties.
Implementation Method 1
a substrate layer disposed on the display panel and including a substrate high-refractive layer and a substrate low-refractive layer; and a surface layer disposed on the substrate layer and including a surface high-refractive layer and a surface low-refractive layer
Implementation Method 2
A refractive index of each of the substrate high-refractive layer and the surface high-refractive layer may be about 1.9 to 2.3. A refractive index of each of the substrate low-refractive layer and the surface low-refractive layer may be about 1.4 to 1.7
Data Source
AI summary
An anti-reflection layer includes a substrate layer including a substrate high-refractive layer and a substrate low-refractive layer, and a surface layer disposed on the substrate layer and including a surface high-refractive layer and a surface low-refractive layer. A thickness of the substrate high-refractive layer may be 5 nm to 70 nm, a thickness of the substrate low-refractive layer may be 5 nm to 70 nm, a thickness of the surface high-refractive layer may be 100 nm to 180 nm, and a thickness of the surface low-refractive layer may be 60 nm to 110 nm.