Antireflective Glass with Embedded Nanoparticles
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Solution Overview
Problem
Conventional antireflective coatings for electronic device screens and windows are prone to air pocket formation, scratching, and lack durability, leading to disrupted viewing and short lifespan.
Innovation Solution
A durable antireflective layer is created by embedding nominally hexagonally packed nanoparticles into the surface of a glass substrate, either partially within the glass or secured by an inorganic and/or organo-silicon binder, with a reflectance of less than 2% across specific wavelengths, and enhanced by chemical strengthening and scratch resistance techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive films are used for antireflective coating, then application to screens is achieved, but air pockets form and viewing is disrupted
Solution Approach 1:
The invention removes the adhesive film layer entirely and replaces it with nanoparticles directly embedded in the glass substrate surface. This extraction eliminates the interface between film and glass that traps air pockets, thereby removing the source of viewing disruption while maintaining the antireflective function.
Solution Approach 2:
The invention merges the antireflective coating function directly with the glass substrate by embedding nanoparticles into the glass surface. This integration eliminates the separate adhesive film layer, preventing air pocket formation between the coating and substrate while ensuring viewing quality.
2Reliability
If adhesive films are used for antireflective coating, then coverage is achieved, but the films are easily scratched and lack durability
Solution Approach 1:
The invention creates an asymmetric structure where nanoparticles are embedded to different depths in the glass substrate, with some particles partially embedded and others fully embedded. This asymmetric embedding pattern creates a mechanically interlocked structure that significantly enhances scratch resistance compared to surface-applied adhesive films.
Solution Approach 2:
The nanoparticles are nested within the glass substrate matrix, with particles embedded at varying depths. This nesting structure provides mechanical interlocking and anchoring, making the antireflective coating highly resistant to scratching and wear while maintaining durability over prolonged use.
3Reliability
If nanoparticles are embedded in glass surface, then durability and scratch resistance are improved, but manufacturing complexity increases
Solution Approach 1:
The nanoparticles are applied to the glass substrate surface before the glass is fully cooled and solidified. This preliminary action allows the nanoparticles to be embedded into the glass matrix during the final cooling stages, utilizing the natural softening of the glass near its transition temperature. This timing simplifies the manufacturing process by embedding particles during a naturally occurring soft state rather than requiring subsequent high-energy embedding steps.
Solution Approach 2:
The invention utilizes the temperature-dependent viscosity changes of glass during cooling. By applying nanoparticles when the glass is still relatively soft (near its transition temperature) and then allowing it to cool and solidify, the particles become naturally embedded without requiring complex post-processing steps. This parameter-based approach (temperature/viscosity control) simplifies manufacturing while achieving durable embedding.
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 a transparent glass article with reduced reflectance, high durability, and resistance to scratches and air pockets, maintaining low reflectance and haze even after repeated use, ensuring clear visibility and prolonged functionality.
Implementation Method 1
heating or by providing a binder that secures the nanoparticles to the surface of the glass
Implementation Method 2
antireflective coatings that comprise nanostructures arranged in a random or periodic fashion on a glass substrate surface
Data Source
Figure 1(a)~1(c)
Figure 2
Figure 3
AI summary
Durable antireflective coatings and glass articles having such coatings are described herein. The antireflective coatings generally include a layer of nominally hexagonally packed nanoparticles that are partially embedded either in a surface of the glass article or in a binder that is on the surface of the glass article. Methods of making the antireflective coatings or layers and glass articles having such antireflective layers are also described.