Cover Window Nitride Coating for Scratch-Resistant Low Reflectance
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Solution Overview
Problem
Display panels with low-refractive-index layers are prone to scratching due to their softness, which compromises their durability and display quality.
Innovation Solution
A cover window structure is introduced with a nitrogen-containing layer disposed on an anti-reflection layer, having a thickness of 0.5 nm to 5 nm, which enhances the hardness and scratch resistance of the display panel while maintaining low reflectance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a low-refractive-index layer is used to reduce reflectance and improve display quality, then display quality is improved, but the layer becomes soft and prone to scratching
Solution Approach 1:
The patent applies composite materials by creating a multi-layer anti-reflection structure where a low-refractive-index layer (silicon oxide or aluminum oxide) is combined with a nitrogen-containing layer (silicon nitride or aluminum nitride). The low-refractive-index layer reduces reflectance while the nitrogen-containing layer provides hardness and scratch resistance, achieving both optical performance and mechanical durability through material composition.
Solution Approach 2:
The patent applies local quality by assigning different functional properties to different layers within the anti-reflection structure. The low-refractive-index layer is specifically optimized for optical performance (low reflectance), while the nitrogen-containing layer is specifically optimized for mechanical performance (hardness and scratch resistance). Each layer performs its specialized function locally within the composite structure.
2Strength
If a nitrogen-containing layer is added to improve hardness and scratch resistance, then durability is improved, but the layer thickness and structural complexity increase
Solution Approach 1:
The patent applies segmentation by dividing the anti-reflection function into multiple specialized layers: a low-refractive-index layer for optical performance and a nitrogen-containing layer for mechanical protection. This segmentation allows each layer to be optimized for its specific function while working together as an integrated anti-reflection system.
Solution Approach 2:
The patent applies parameter changes by precisely controlling the thickness of each layer (low-refractive-index layer: 50-200 nm, nitrogen-containing layer: 5-50 nm) and their refractive indices to achieve optimal balance between optical performance and mechanical durability. The nitrogen content and layer thickness are tuned to provide scratch resistance while maintaining anti-reflection properties.
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 nitrogen-containing layer improves the scratch resistance and durability of the display panel without significantly increasing reflectance, thereby enhancing the overall reliability and display quality.
Implementation Method 1
Nitrogen of the nitrogen-containing layer may be chemically bonded to a material of the low-refractive-index layer
Data Source
AI summary
A cover window includes a base layer, an anti-reflection layer disposed on the base layer, and a nitrogen-containing layer disposed on the anti-reflection layer. The anti-reflection layer includes a high-refractive-index layer and a low-refractive-index layer disposed on the high-refractive-index layer. The nitrogen-containing layer has a thickness within a range of about 0.5 nm to about 5 nm, inclusive. Therefore, the cover window may have improved hardness and scratch resistance while exhibiting excellent reflectance.