Anti-reflective film-attached transparent substrate and image display device
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Solution Overview
Problem
Conventional anti-reflective film-attached transparent substrates fail to sufficiently suppress glare due to external light reflection.
Innovation Solution
An anti-reflective film-attached transparent substrate is designed with a diffusion layer and anti-reflective film on one surface, featuring a lamination structure of dielectric layers with different refractive indices, a luminous reflectance of 1% or lower, a diffuse reflectance ratio of 0.15 or higher, a haze value of 10% or larger, and an anti-fouling film, using specific oxide compositions for the dielectric layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional anti-reflective film is applied to a transparent substrate, then the structure is simple and manufacturing is easy, but the luminous reflectance is high and glare suppression is insufficient
Solution Approach 1:
The anti-reflective film is divided into multiple dielectric layers (first dielectric layer and second dielectric layer) with different refractive indices, where each layer has a specific thickness designed to achieve destructive interference of reflected light. This segmented structure reduces luminous reflectance to 1% or lower by controlling optical path differences between reflections from different interfaces.
Solution Approach 2:
The patent uses composite dielectric materials with different refractive indices (first dielectric layer with refractive index n1 and second dielectric layer with refractive index n2, where n1 > n2) to create an anti-reflective coating system. This composite structure allows optimization of light interference patterns while maintaining mechanical durability and optical clarity.
2Object-affected harmful factors
If the anti-reflective film uses multiple dielectric layers with different refractive indices, then the luminous reflectance is reduced, but the manufacturing precision requirement increases
Solution Approach 1:
The patent specifies precise thickness parameters for each dielectric layer (first dielectric layer thickness d1 and second dielectric layer thickness d2) to achieve the desired optical interference effect. By controlling these dimensional parameters within specific ranges, the luminous reflectance is reduced to 1% or lower while providing clear manufacturing guidelines for precision control.
3Object-affected harmful factors
If a diffusion layer is added to the transparent substrate, then the haze value increases and light scattering improves, but the luminous transmittance decreases
Solution Approach 1:
The diffusion layer is applied locally to specific regions of the transparent substrate where specular reflection needs to be suppressed, rather than uniformly across the entire substrate. This localized diffusion approach scatters reflected light to reduce glare while minimizing the impact on overall luminous transmittance by limiting the diffusion effect to areas where it is most needed.
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
Effectively suppresses glare from external light reflection, enhances image clarity, and maintains durability and tactile sensation while reducing yellowish transmission.
Implementation Method 1
the anti-reflective film has a lamination structure in which at least two dielectric layers having different refractive indices are laminated
Implementation Method 2
at least two dielectric layers having different refractive indices are laminated
Implementation Method 3
a diffusion layer and an anti-reflective film that are formed in this order on one major surface of a transparent substrate
Data Source
AI summary
An anti-reflective film-attached transparent substrate includes: a transparent substrate including two major surfaces; and a diffusion layer and an anti-reflective film on one major surface of the transparent substrate, which are provided in this order. (A) A luminous reflectance SCI Y of an outermost surface of the anti-reflective film-attached transparent substrate is 1% or lower. (B) The anti-reflective film has a lamination structure in which at least two dielectric layers having different refractive indices are laminated. (C) A ratio (SCE Y)/(SCI Y) of a diffuse reflectance SCE Y of the outermost surface of the anti-reflective film-attached transparent substrate to the luminous reflectance SCI Y of the outermost surface of the anti-reflective film-attached transparent substrate is 0.15 or higher.