Anti-Reflection Transparent Substrate for Tiled Display Color Consistency
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Solution Overview
Problem
Existing anti-reflection films on transparent substrates used in image display devices, particularly in large μ-LED displays, exhibit significant color tone changes due to varying incident and emission angles, leading to noticeable color deviations when panels are tiled, which degrades the appearance and quality.
Innovation Solution
An anti-reflection film-attached transparent substrate is designed with specific conditions for diffusely reflected light at various angles, ensuring a* and b* values fall within predetermined ranges to minimize color deviation, using a multilayer film structure with dielectric layers and a diffusion layer to control light reflection and diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an anti-reflection film is provided on a diffusion layer to suppress reflection and improve blackened texture, then reflection of incident light is suppressed and whiteness is reduced, but color tone changes significantly at different viewing angles leading to noticeable color deviation when panels are tiled
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thickness of each layer in the anti-reflection film (first dielectric layer: 3-12nm, second dielectric layer: 80-95nm, third dielectric layer: 30-60nm) and adjusting the refractive indices of materials to achieve optimal optical interference conditions that minimize color deviation across different viewing angles
Solution Approach 2:
The patent uses composite materials by combining multiple dielectric layers with different refractive indices (TiO2 with n=2.38, SiO2 with n=1.46, Nb2O5 with n=2.18) to create a multilayer anti-reflection film structure that achieves both reflection suppression and color tone stability through constructive and destructive interference
2Object-affected harmful factors
If a diffusion layer is provided on a transparent substrate to diffuse incident light, then reflection is suppressed, but the screen appears whitish when turned off
Solution Approach 1:
The patent segments the anti-reflection function into multiple distinct dielectric layers, each with specific thickness and refractive index requirements, allowing independent optimization of each layer's contribution to reflection suppression while controlling the overall optical properties to prevent excessive whiteness
Solution Approach 2:
The patent applies local quality by creating a diffusion layer with specific surface roughness characteristics (Sa: 0.05-0.6μm, Sdr: 0.001-0.4) only on the front surface of the transparent substrate, concentrating the light-diffusing function where it is most needed while maintaining clarity in other regions
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 an anti-reflection film-attached transparent substrate with reduced color deviation after tiling, enhancing the quality and aesthetic appearance of image display devices by maintaining consistent color tone across different viewing angles.
Implementation Method 1
Since the anti-reflection film as disclosed in Patent Document 1 uses optical interference, an optical path length changes depending on an incident angle or an emission angle of light
Implementation Method 2
The diffusion layer suppresses reflection of external light by diffusing incident light
Data Source
AI summary
An anti-reflection film-attached transparent substrate includes: a transparent substrate having two main surfaces; and a diffusion layer and an anti-reflection film in this order from a transparent substrate side on one main surface of the transparent substrate. When a light source is incident on the one main surface side at an incident angle of 45° in a state where reflection on the other main surface of the transparent substrate is removed, a* and b* of diffusely reflected light at each angle of −15°, 15°, 25°, 45°, 75°, and 110° with respect to specularly reflected light under a D65 light source satisfy the following expressions (1) −2≤a*≤4.5 and (2) −5≤b*≤10.