Optical Laminate Surface Curvature for Anti-Glare and Low Reflectance
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Solution Overview
Problem
Existing anti-glare films fail to provide high anti-glare properties in high-definition liquid crystal display devices and organic electroluminescence displays.
Innovation Solution
An optical laminate with an anti-glare layer having an arithmetic mean peak curvature of 1.5 mm−1 or less and transmission image clarity of 85% or less, combined with a low refractive index layer that fits well with the anti-glare layer, enhancing both anti-glare and antireflection properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a low refractive index layer is provided on the anti-glare layer to reduce luminous reflectance, then antireflection property is improved, but the low refractive index layer does not properly fit to the recesses and protrusions of the anti-glare layer, reducing the antireflection property
Solution Approach 1:
The patent changes the surface curvature parameter of the anti-glare layer by controlling the radius of curvature of protrusions to be 0.5 mm or more and depressions to be −0.2 mm or more. This parameter adjustment enables the low refractive index layer to properly fit the surface topology, resolving the contradiction between reducing luminous reflectance and maintaining antireflection property.
2Object-affected harmful factors
If recesses and protrusions are formed on the anti-glare layer surface to scatter external light, then anti-glare properties are improved, but the arithmetic mean peak curvature Spc is too large, reducing the fit with the low refractive index layer
Solution Approach 1:
The patent precisely controls the surface curvature parameters by setting the radius of curvature of protrusions to 0.5 mm or more and depressions to −0.2 mm or more, resulting in an arithmetic mean peak curvature Spc of 1.5 mm−1 or less. This parameter optimization maintains anti-glare scattering functionality while ensuring proper fit with the low refractive index layer.
3Illumination intensity
If the transmission image clarity is increased to improve visibility, then transparency is improved, but the anti-glare properties are reduced
Solution Approach 1:
The patent optimizes the balance between transmission image clarity and anti-glare properties by controlling the surface curvature parameters (protrusion radius ≥ 0.5 mm, depression radius ≥ −0.2 mm) and specifying the refractive index of the anti-glare layer to be 1.53 or less. These parameter changes enable the optical laminate to achieve transmission image clarity of 85% or less while maintaining effective anti-glare scattering.
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 laminate achieves improved anti-glare and antireflection properties without excessive haze, maintaining excellent transparency and visibility.
Implementation Method 1
recesses and protrusions are formed on its surface to impart anti-glare properties by scattered reflection of external light
Implementation Method 2
a layer having a low refractive index, a low refractive index layer in another word, is provided for reducing the luminous reflectance on the recesses and protrusions
Data Source
AI summary
Provided is an optical laminate produced by disposing an anti-glare layer on at least one side of a light-transmitting substrate, the anti-glare layer having a surface that has the arithmetic mean peak curvature Spc of 1.5 mm−1 or less in absolute value, the optical laminate has the adjusted transmission image clarity of 85% or less. On the anti-glare layer, further disposed is a low refractive index layer. The optical laminate including the low refractive index layer may have a luminous reflectance of 1.4 or less. The optical laminate improves the anti-glare properties.