Optical Film Surface Profile for Anti-Glare and Wiping
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Solution Overview
Problem
Existing optical films with anti-glare layers having depressions and projections suffer from reduced fingerprints wiping off properties as the anti-glare properties are enhanced, and lack examination on dirt resistance.
Innovation Solution
An optical film with a surface profile of depressions and projections, featuring an anti-reflection layer and an anti-glare layer, where the first surface has an arithmetic mean height Sa of 0.05 μm or more and satisfies the relation Sw×Vmp≤2, where Sw is the tilt angle of a 30 μl pure water droplet and Vmp is the peak material volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the anti-glare properties are enhanced by forming deeper depressions and projections on the surface, then the anti-glare effect is improved, but the fingerprints wiping off properties are reduced
Solution Approach 1:
The patent applies parameter changes by precisely controlling the surface profile parameters Sa (arithmetic mean height) and Vmp (peak material volume) to resolve the contradiction. By setting Sa to 0.05 μm or more and satisfying the relation Sw×Vmp≤2, the invention optimizes the balance between anti-glare properties and fingerprints wiping off properties, allowing both functions to coexist effectively
2Object-affected harmful factors
If the optical film has a surface profile with depressions and projections for anti-glare, then anti-glare properties are improved, but dirt resistance is not sufficiently examined and may be reduced
Solution Approach 1:
The patent addresses dirt resistance by controlling surface parameters Sa and Vmp within specific ranges. By setting Sa≥0.05 μm and Sw×Vmp≤2, the invention creates a surface profile that maintains anti-glare properties while ensuring sufficient dirt resistance, preventing dirt accumulation in the depressions
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 and favorable fingerprints wiping off properties, while the method for producing and selecting such films ensures efficient and effective performance.
Implementation Method 1
Sw represents a tilt angle (degrees) of 30 μl pure water droplet flowing down on the first surface
Data Source
AI summary
An optical film having high anti-glare properties and favorable fingerprints wiping off properties is provided. The optical film has a first surface, and a second surface which is a surface opposite to the first surface, wherein the optical film comprises an anti-reflection layer and an anti-glare layer in this order from the first surface to the second surface, the first surface has a profile of depressions and projections, the first surface has an arithmetic mean height Sa of 0.05 μm or more specified in ISO 25178-2:2012, and the first surface satisfies the relation represented by the following Expression 1: Sw×Vmp≤2.00 (Expression 1) wherein “Sw” represents a tilt angle (degrees) of 30 μl pure water droplet flowing down on the first surface; and “Vmp” represents a value of a peak material volume (ml/m2) of the first surface specified in ISO 25178-2:2012.