Optical Film Anti-Glare Rough Surface Design
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Solution Overview
Problem
Conventional display modules suffer from glare issues due to external ambient light, leading to visual discomfort and uneven energy distribution on the display surface, which conventional anti-glare films fail to adequately address.
Innovation Solution
An optical film with a rough surface featuring specific mid-angle inclined structures and a uniform energy distribution, designed to reduce glare and enhance reading comfort, while also improving anti-scratch ability by limiting the area proportion of structures with larger tilt angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a high-haze layer with a rough surface is added to reduce glare, then the anti-glare effect is improved, but residual light source reflections remain and energy distribution becomes uneven
Solution Approach 1:
The patent applies local quality by creating specific mid-angle inclined structures (20-50 degrees) within the rough surface that have different optical properties from other areas. These localized structures with controlled tilt angles and specific projection areas (31-60% for >20 degrees, <7% for >50 degrees) selectively scatter light to reduce glare while maintaining uniform energy distribution, rather than using a uniformly rough surface throughout.
Solution Approach 2:
The patent changes the geometric parameters of the rough surface structures by controlling the tilt angle distribution and height differences (0.6-2.5 μm between 25% and 75% of measuring points). By adjusting these parameters—specifically limiting mid-angle structures to 31-60% projection area and very steep structures to <7%—the film achieves optimized light scattering that reduces glare while preventing residual reflections and ensuring uniform energy distribution.
2Object-affected harmful factors
If the haze and roughness of the anti-glare film are increased to reduce glare, then the anti-glare performance is improved, but reading comfort deteriorates due to uneven energy distribution
Solution Approach 1:
The patent creates localized mid-angle inclined structures with specific geometric characteristics (20-50 degree tilt angles, controlled projection areas) that selectively interact with incident light. These localized structures scatter light effectively to reduce glare while their specific geometry prevents excessive concentration of reflected energy, thereby maintaining reading comfort even with increased overall roughness.
Solution Approach 2:
The patent optimizes reading comfort by controlling the statistical distribution of surface structure parameters: limiting the projection area of structures with tilt angles >20 degrees to 31-60% and >50 degrees to <7%, and controlling height differences between 0.6-2.5 μm. These parameter constraints ensure that while the film has sufficient roughness for glare reduction, the energy distribution remains uniform enough for comfortable reading.
3Object-affected harmful factors
If structures with larger tilt angles are increased to improve anti-glare effect, then light scattering is enhanced, but anti-scratch ability deteriorates
Solution Approach 1:
The patent applies local quality by creating a hierarchical structure distribution: mid-angle inclined structures (20-50 degrees) provide light scattering functionality, while limiting very steep structures (>50 degrees) to <7% projection area. This localized control ensures that anti-glare performance is achieved through the predominant mid-angle structures, while the limited presence of steep structures maintains structural integrity and anti-scratch ability.
Solution Approach 2:
The patent resolves this contradiction by changing the angular parameter distribution of surface structures. By constraining the projection area of structures with tilt angles >50 degrees to less than 7%, the patent ensures that while sufficient light scattering occurs through mid-angle structures (31-60% for >20 degrees), the structural robustness required for scratch resistance is preserved by minimizing extremely steep, vulnerable structures.
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 effectively destroys light spots, providing improved anti-glare performance and uniform energy distribution, enhancing reading comfort and increasing the anti-scratch ability of the film.
Implementation Method 1
the rough surface having a plurality of measuring points constituting a plurality of virtual measuring planes, a normal to each of the virtual measuring planes having an angle included with a normal to the reference plane
Data Source
AI summary
An optical film includes a rough surface having multiple measuring points constituting multiple virtual measuring planes in a given unit measuring area. A normal to each virtual measuring plane has an angle with a normal to a reference plane. On the reference plane, the projection area of the virtual measuring planes having the angle larger than 20 degrees ranges from 31% to 60% of the projection area of the given unit measuring area. The projection area of the virtual measuring planes having the angle larger than 50 degrees is less than 7% of the projection area of the given unit measuring area. 25% of the measuring points has the height larger than a first height. 75% of the measuring points has the height larger than a second height. The first height and the second height have a difference not less than 0.6 μm and not larger than 2.5 μm.