Optical Film Continuous Wave Surface Antiglare
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Solution Overview
Problem
Conventional optical films with surface concavo-convex structures formed using fine particles fail to maintain high image quality and definition in modern display devices due to distortion and glare issues, leading to a degradation in image clarity and contrast.
Innovation Solution
An optical film with a base member having two-dimensionally arranged convex structures and a hard-coating layer is developed, where the hard-coating layer forms a continuous wave surface conforming to the base member's structure, with a specific amplitude-to-wavelength ratio, allowing for effective diffuse reflection without using fine particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a fine concavo-convex structure is formed on the surface using fine particles to diffuse-reflect external light, then antiglare property is improved, but image quality deteriorates due to distortion and glare variations
Solution Approach 1:
The patent removes fine particles from the hard-coating layer composition, extracting the harmful element that causes image quality degradation while preserving the antiglare function through an alternative mechanism (surface concavo-convex structure without particles).
Solution Approach 2:
The invention creates a localized concavo-convex structure on the surface of the hard-coating layer with specific dimensional parameters (peak-to-valley distance 0.5-5.0 μm, curvature radius 0.03-0.5 μm) to achieve antiglare effect only in the necessary surface region, maintaining optical clarity in the bulk material.
2Object-affected harmful factors
If a surface concavo-convex structure is formed to diffuse-reflect light, then antiglare property is improved, but definition and clarity deteriorate due to light distortion
Solution Approach 1:
The patent specifies precise parameter ranges for the surface structure: peak-to-valley distance of 0.5-5.0 μm and curvature radius of 0.03-0.5 μm. These controlled parameters enable effective light diffusion for antiglare while minimizing distortion that would degrade image definition.
Solution Approach 2:
The invention applies a partial concavo-convex structure only at the surface level of the hard-coating layer, rather than throughout the entire material. This partial action provides sufficient antiglare effect while avoiding excessive light interaction that would cause image degradation.
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 achieves a high antiglare property and high contrast while maintaining optical transparency, suppressing the feeling of opacity and allowing for precise control of the diffuse reflection property, thus enhancing image clarity and definition in display devices.
Implementation Method 1
a technique in which a fine concavo-convex structure is formed on the surface has been employed... to diffuse-reflect external light at the surface of a screen
Implementation Method 2
light that is transmitted through an optical film is distorted by refraction or diffusion caused by fine particles in an antiglare layer
Data Source
AI summary
An optical film includes a base member having convex structures that are two-dimensionally and orderly arranged on a surface thereof and a hard-coating layer provided on the surface of the base member, the surface having the arranged structures thereon. A continuous wave surface is provided on a surface of the hard-coating layer so as to approximately conform to the shape of the structures of the surface of the base member, a maximum amplitude A and a minimum wavelength λ of the continuous wave surface are each substantially uniform, and a ratio (A/λ) of the maximum amplitude A to the minimum wavelength λ is more than 0.002 and 0.011 or less.