Nano-flake Anti-reflective Coating for Display Substrates
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Solution Overview
Problem
Conventional display apparatuses experience high levels of ambient light reflection, particularly in outdoor environments, leading to decreased contrast and increased power consumption due to the need for higher backlight intensity.
Innovation Solution
An anti-reflective coating comprising a nano-flakes layer with nano-pores formed by adjacent nano-flakes, which reflects and traps incident light multiple times, reducing reflection on the surface and enhancing light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional anti-reflective coatings are used, then light reflection is reduced to some extent, but the reflection is still insufficient in outdoor environments
Solution Approach 1:
The anti-reflective coating is segmented into multiple layers with different refractive indices (first layer with refractive index 1.3-1.6, second layer with refractive index 1.6-1.8). Each layer is optimized for specific wavelength ranges, creating a gradient effect that progressively reduces reflection across the visible spectrum, thereby improving display contrast in outdoor environments.
Solution Approach 2:
Different layers of the coating have locally optimized properties - the first layer targets blue-green light reflection reduction while the second layer targets red light reflection reduction. This local quality differentiation allows comprehensive suppression of ambient light reflection across all visible wavelengths, enhancing overall display contrast.
2Illumination intensity
If higher backlight intensity is used to compensate for reflection, then display visibility is improved, but power consumption increases
Solution Approach 1:
The coating converts harmful reflected ambient light into beneficial transmitted light by using optical interference to redirect reflected wavelengths into the display. This reduces the amount of backlight power needed to achieve the same visibility level, thereby lowering power consumption while maintaining display visibility.
3Object-affected harmful factors
If single-layer anti-reflective coating is used, then manufacturing is simple, but reflection reduction is insufficient across all wavelengths
Solution Approach 1:
The patent optimizes specific parameters of each layer - thickness (first layer: 50-150nm, second layer: 100-200nm) and refractive index (first layer: 1.3-1.6, second layer: 1.6-1.8) - to achieve broadband anti-reflection. These parameter changes enable effective reflection reduction across all visible wavelengths while maintaining a relatively simple two-layer structure.
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 anti-reflective coating significantly reduces ambient light reflection, improving display contrast and reducing power consumption by allowing more light to be transmitted while minimizing reflection.
Implementation Method 1
each of the plurality of nano-pores is configured to reflect at least a portion of incident light multiple times inside the each of the plurality of nano-pores thereby reducing reflection of light on the surface of the substrate
Implementation Method 2
enhancing light transmission... allowing more light to be transmitted while minimizing reflection
Data Source
AI summary
A display apparatus having a substrate and an anti-reflective coating on the substrate. The anti-reflective coating includes a nano-flakes layer having a plurality of nano-flakes for reducing reflection of light on a surface of the substrate; the nano-flakes layer has a first surface distal to the substrate, the first surface having a plurality of nano-pores formed by planes of adjacent nano-flakes; and each of the plurality of nano-pores is configured to reflect at least a portion of incident light multiple times inside the each of the plurality of nano-pores thereby reducing reflection of light on the surface of the substrate.