Optical Film Surface Geometry for Anti-Glare and Scratch Resistance
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Solution Overview
Problem
Traditional optical films with large surface depressions and projections exhibit insufficient anti-glare properties in the oblique direction and reduced scratch resistance.
Innovation Solution
An optical film with a surface featuring a developed interfacial area ratio (Sdr) of 0.010 to 0.060 and a minimum autocorrelation length (Sal) of 4.0 μm to 12.0 μm, designed to enhance anti-glare properties in both front and oblique directions while maintaining scratch resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If larger depressions and projections are formed on the surface of the optical film, then anti-glare properties in the front direction are improved, but anti-glare properties in the oblique direction become insufficient and scratch resistance is reduced
Solution Approach 1:
The patent applies parameter changes by precisely controlling the surface profile parameters Sdr (developed interfacial area ratio) within 0.010-0.060 and Sal (minimum autocorrelation length) within 4.0-12.0 μm. This quantitative control of surface geometry parameters enables the optical film to achieve balanced anti-glare properties in both front and oblique directions while maintaining scratch resistance, resolving the technical contradiction between front-direction anti-glare and oblique-direction performance.
2Ease of manufacture
If the surface depressions and projections are made larger to improve front direction anti-glare, then front direction anti-glare is improved, but scratch resistance is reduced
Solution Approach 1:
The patent resolves this contradiction by changing the surface geometry parameters to specific ranges: Sdr (developed interfacial area ratio) of 0.010-0.060 and Sal (minimum autocorrelation length) of 4.0-12.0 μm. These parameter changes create an optimal surface structure that provides sufficient anti-glare effect while maintaining adequate scratch resistance, avoiding the damage caused by larger depressions and projections.
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 favorable anti-glare properties in both front and oblique directions and improved scratch resistance by controlling the Sdr and Sal within specified ranges.
Implementation Method 1
an optical film having a surface with depressions and projections may be disposed on their surfaces to suppress reflections of backgrounds such as lighting and people
Data Source
AI summary
Provided is an optical film which has high anti-glare properties and high scratch resistance and enables a suppression in reflected scattered light. An optical film having a surface with depressions and projections, wherein the surface with depressions and projections has a developed interfacial area ratio Sdr of 0.010 or more and 0.060 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 25178-2:2012.