Antireflection Coating for Foldable Screens via Porous Layer Design
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Solution Overview
Problem
Current antireflection coatings on electronic devices, particularly those with foldable screens, suffer from poor light reflection reduction, especially for oblique light, leading to severe light reflection and optical creases, which degrade the user's visual experience.
Innovation Solution
The antireflection coating employs a porous structure with a thin film layer configuration, where the refractive index is reduced by incorporating air-filled holes, allowing for improved light reflection suppression across various angles, including oblique light, and is applied in a manner that enhances wear-resistance and bonding with the cover structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional antireflection coating is used, then the manufacturing process is simple, but the antireflection effect on oblique light is poor
Solution Approach 1:
The patent applies porous materials by forming a porous layer within the antireflection coating structure. The porous layer contains numerous pores that reduce the refractive index of the coating, thereby improving the antireflection effect particularly for oblique light. This resolves the contradiction by enhancing optical performance through controlled porosity while maintaining a manageable coating structure.
Solution Approach 2:
The patent employs composite materials by combining multiple layers with different refractive indices and structures, including a porous layer, a non-porous layer, and potentially a gradient refractive index layer. This composite structure achieves superior antireflection performance across various light angles while keeping the overall design systematic and manufacturable.
2Reliability
If the refractive index of the surface thin film layer is reduced to improve antireflection, then the antireflection effect improves, but the wear-resistance may deteriorate
Solution Approach 1:
The patent applies local quality by creating distinct layers with different properties: the porous layer with lower refractive index for antireflection, and a non-porous layer with higher refractive index and better mechanical properties for wear-resistance. Each layer performs its specific function locally, resolving the contradiction between optical performance and mechanical durability.
Solution Approach 2:
The patent segments the antireflection coating into multiple functional layers rather than using a single uniform layer. The porous layer handles optical performance while the non-porous layer provides mechanical strength, and potentially a gradient layer transitions between them. This segmentation allows independent optimization of antireflection and wear-resistance 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
This solution significantly reduces light reflection on electronic device screens, improving visual clarity and eliminating optical creases, while maintaining durability and reliability through enhanced wear-resistance and bonding performance.
Implementation Method 1
the porous structure is configured to reduce a refractive index of the first thin film layer
Implementation Method 2
An antireflection coating, also referred to as an antireflective coating, is usually used in an electronic device that has an antireflection requirement
Data Source
AI summary
This application discloses an antireflection coating, a cover structure, and a method for manufacturing an antireflection coating. The antireflection coating includes one or more antireflection units. The plurality of antireflection units are sequentially stacked in a first direction, and the first direction is a light-emitting direction of the antireflection coating. The one or more antireflection units include a first antireflection unit. The first antireflection unit includes a first thin film layer and a second thin film layer. The second thin film layer and the first thin film layer are sequentially stacked in the first direction, and a surface that is of the first thin film layer and that is away from the second thin film layer is a light-emitting surface of the antireflection coating.