Anti-Reflective Transparent Substrate for Angle-Stable Reflection Color
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Solution Overview
Problem
Anti-reflective films in image display devices, particularly those with diffusion layers, exhibit noticeable color deviations due to changes in reflection color with varying incident and emission angles, especially in large μ-LED displays, which degrade the appearance and quality.
Innovation Solution
An anti-reflective film-attached transparent substrate with specific conditions for a* and b* values of diffusely reflected light at different angles, combined with a laminated dielectric structure, to minimize color deviation after tiling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an anti-reflective film utilizing optical interference is provided on a diffusion layer, then reflection of incident light can be prevented and whiteness can be reduced, but color tone changes remarkably depending on viewing angle
Solution Approach 1:
The patent applies parameter changes by precisely controlling the optical path length of the anti-reflective film and the haze value of the diffusion layer. By setting the optical path length to 100-200 nm and haze value to 30-80%, the invention optimizes the balance between glare prevention and color tone stability across different viewing angles
Solution Approach 2:
The invention applies local quality by creating specific functional zones within the optical layers. The diffusion layer is designed with specific haze characteristics to control light scattering locally, while the anti-reflective film is positioned at specific thickness to control interference effects at particular optical paths, achieving localized optimization of optical properties
2Area of stationary object
If multiple LED panels are tiled to produce a large display, then display size is increased, but color deviation becomes noticeable due to angle-dependent reflection
Solution Approach 1:
The patent uses parameter changes to standardize the optical characteristics across multiple panels. By controlling the anti-reflective film optical path length (100-200 nm) and diffusion layer haze (30-80%), each panel maintains consistent color properties, ensuring uniform appearance when tiled together for large displays
Solution Approach 2:
The invention applies equipotentiality by making all tiled panels have identical optical path lengths and haze values, creating equal optical conditions across the entire display surface. This ensures that color tones remain consistent regardless of viewing angle or panel position
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 noticeable color deviations, enhancing the quality and aesthetic appearance of the substrate and image display devices by maintaining consistent color tones across viewing angles.
Implementation Method 1
Since the anti-reflective film disclosed in Patent Literature 1 utilizes optical interference, an optical path length changes depending on an incident angle and an emission angle of the light
Implementation Method 2
it is also known to provide a diffusion layer on the transparent substrate. The diffusion layer diffuses the incident light to prevent the glare from the external light
Data Source
AI summary
An anti-reflective film-attached transparent substrate includes: a transparent substrate comprising two main surfaces; and a diffusion layer and an anti-reflective film in this order from a transparent substrate side on one main surface of the transparent substrate. When reflection on the other main surface of the transparent substrate is eliminated and a light source is incident on the one main surface at an incident angle of 45°, a* and b* of diffusely reflected lights at angles of 15°, 25°, and 45° with respect to a specularly reflected light under a D65 light source satisfy formulas (1) −8≤a*≤1, (2) −2≤b*≤6, and (3) b*≤−1×a*−1.