Optical Film Surface Topography for Anti-Glare and Scratch Resistance
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Solution Overview
Problem
Traditional optical films with larger depressions and projections on the surface suffer from reduced scratch resistance and jet-black appearance due to reflected scattered light.
Innovation Solution
An optical film with a surface featuring depressions and projections that have a peak height (Spk) of 0.20 μm to 1.00 μm and a minimum autocorrelation length (Sal) of 4.0 μm to 12.0 μm, which suppresses reflected scattered light and enhances scratch resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If larger depressions and projections are formed on the surface of the optical film, then anti-glare properties are improved, but scratch resistance deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the peak height (Spk) within 0.20-1.00 μm and autocorrelation length (Sal) within 4.0-12.0 μm ranges. This optimization balances the surface topology to achieve effective light scattering for anti-glare properties while maintaining sufficient structural integrity for scratch resistance, resolving the contradiction between these two opposing requirements.
Solution Approach 2:
The patent employs partial action by forming depressions and projections with moderate dimensions rather than maximizing surface irregularity. The controlled Spk and Sal parameters create sufficient surface variation to scatter glare-inducing light while avoiding excessive surface disruption that would compromise scratch resistance, achieving an optimal balance point.
2Object-affected harmful factors
If larger depressions and projections are formed on the surface of the optical film, then anti-glare properties are improved, but jet-black appearance deteriorates
Solution Approach 1:
The patent resolves this contradiction through parameter optimization by constraining Spk to 0.20-1.00 μm and Sal to 4.0-12.0 μm. These controlled parameters enable effective scattering of specular reflection (improving anti-glare) while preserving the absorption characteristics needed for jet-black appearance, avoiding the excessive surface disruption that would cause light scattering to degrade display contrast.
3Object-affected harmful factors
If the peak height Spk is increased, then anti-glare properties are improved, but scratch resistance deteriorates
Solution Approach 1:
The patent directly addresses this contradiction through parameter changes by establishing the Spk range of 0.20-1.00 μm. This controlled peak height provides sufficient surface variation to scatter glare-inducing light effectively while maintaining the structural integrity necessary for scratch resistance, preventing both under-engineering (insufficient anti-glare) and over-engineering (excessive surface disruption).
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 optical film achieves high anti-glare properties while maintaining favorable scratch resistance by optimizing the peak height and autocorrelation length of the surface features.
Implementation Method 1
suppress reflections of backgrounds such as lighting and people
Data Source
AI summary
Provided is an optical film which has high anti-glare properties, enables a suppress of a reduction in jet-black appearance by reflected scattered light, and has favorable scratch resistance. An optical film having a surface with depressions and projections, wherein the surface with depressions and projections has a reduced peak height Spk of 0.20 μm or more and 1.00 μm or less specified in ISO 25178-2:2012, and a minimum autocorrelation length Sal of 4.0 μm or more and 12.0 μm or less specified in ISO 25178.