Window Coating with Hollow Silica for Low Reflection
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Solution Overview
Problem
Display device windows face challenges in maintaining low reflection characteristics, abrasion resistance, and chemical resistance, particularly in flexible and portable devices that are prone to external shocks, friction, and chemical exposure.
Innovation Solution
A window structure comprising a window base layer, a high refractive layer, a low refractive layer with hollow silica particles, and a primer coating layer, where each layer has specific refractive indices and thicknesses, along with an optional anti-fingerprint layer, is designed to enhance reflectance reduction, durability, and chemical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a window is designed with low reflection characteristics to prevent image quality degradation, then reflection is reduced, but abrasion resistance and chemical resistance deteriorate
Solution Approach 1:
The window coating is divided into multiple functional layers: a hard coating layer for abrasion and chemical resistance, a low refractive layer for reflection reduction, and a primer coating layer for adhesion. Each layer performs a specific function, allowing the system to achieve both low reflection and high durability simultaneously.
Solution Approach 2:
The patent uses composite material structures where the hard coating layer contains inorganic particles for enhanced durability, the low refractive layer uses hollow silica particles for optical performance, and the primer layer provides chemical bonding. This composite approach allows simultaneous achievement of optical and mechanical properties.
2Strength
If a window is designed to protect the display panel against external shock, friction, and abrasion, then durability is improved, but reflection characteristics worsen
Solution Approach 1:
The protective window structure is segmented into distinct functional layers: the hard coating layer provides mechanical protection against shock and abrasion, while the low refractive layer specifically addresses reflection. This segmentation allows each layer to optimize its specific function without compromising the other.
Solution Approach 2:
Different regions of the window coating have different properties: the hard coating layer has high mechanical strength for protection, the low refractive layer has specific optical properties for reflection reduction, and the primer layer has adhesive properties. Each layer's local quality is optimized for its specific function.
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 reduces reflection, increases abrasion and chemical resistance, and maintains low reflection characteristics while providing durability against external factors, thereby improving the overall performance of display devices.
Implementation Method 1
a low refractive layer including hollow silica particles and disposed on the high refractive layer, where each of the low refractive layer and the primer coating layer has a refractive index in a range of about 1.4 to about 1.46
Data Source
AI summary
A window includes a window base layer, a high refractive layer disposed on the window base layer, a low refractive layer including hollow silica particles and disposed on the high refractive layer, and a primer coating layer disposed on the low refractive layer. Each of the low refractive layer and the primer coating layer has a refractive index in a range of about 1.4 to about 1.46. The low refractive layer has a thickness in a range of about 50 nm to about 80 nm.