Optical Diffusion Film Bent Louver Structures
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Solution Overview
Problem
Existing optical diffusion films with single inclination angles or columnar structures have limited optical diffusion incident angle regions, and methods to expand these regions often require expensive equipment and suffer from low stability and high variability in optical diffusion characteristics.
Innovation Solution
An optical diffusion film with a single layer containing a first and second internal structure, where the high refractive index regions in the first structure have a bent section, allowing for the superposition of multiple optical diffusion incident angle regions and improved stability, and a method involving a composition with polymerizable compounds and ultraviolet absorbers to form these structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single louver structure or columnar structure is used in the optical diffusion film, then the manufacturing process is simple, but the optical diffusion incident angle region is insufficient
Solution Approach 1:
The optical diffusion film is divided into multiple independent internal structures (first internal structure with louver configuration and second internal structure with columnar configuration), each contributing to different aspects of optical diffusion. This segmentation allows each structure to be optimized for specific functions while collectively expanding the overall incident angle region.
Solution Approach 2:
The patent combines two different internal structures (louver-type and columnar-type) within a single optical diffusion film layer. The louver structure provides diffusion in one angular range while the columnar structure addresses another angular range, merging their effects to achieve a broader overall incident angle region than either structure could provide alone.
2Adaptability or versatility
If multiple internal structures are combined to expand the optical diffusion incident angle region, then the optical diffusion characteristics improve, but the film structure becomes complex and may cause blurring or delamination
Solution Approach 1:
Multiple internal structures are merged within a single continuous polymer matrix layer, eliminating the need for separate physical layers. This integration maintains structural unity, preventing delamination while achieving complex optical diffusion characteristics through the combined action of louver and columnar structures.
Solution Approach 2:
The optical diffusion film uses a composite material system consisting of a polymer matrix combined with dispersed inorganic particles or liquid crystal droplets that form the internal structures. This composite approach allows the creation of complex multi-structure configurations within a single homogeneous layer, avoiding blurring and delamination issues.
3Ease of manufacture
If conventional methods are used to form internal structures, then the manufacturing process is straightforward, but the optical diffusion characteristics show high variability and low stability
Solution Approach 1:
The patent precisely controls key parameters including the size (5-50 μm diameter), spacing (10-100 μm center-to-center), and orientation of internal structures, as well as the polymer matrix composition and curing conditions. This parameter optimization ensures consistent replication of the desired louver and columnar structures, achieving stable optical diffusion characteristics across production batches.
Solution Approach 2:
The patent replaces mechanical alignment methods with photo-induced self-organization during UV curing. The internal structures form through controlled polymerization and phase separation processes driven by light exposure, eliminating mechanical variability and achieving high stability in structural configuration and optical performance.
4Adaptability or versatility
If the internal structure is curved or bent to expand the incident angle region, then the optical diffusion angle improves, but the manufacturing requires expensive equipment and has low stability
Solution Approach 1:
The internal structures incorporate curved and bent configurations, particularly in the louver elements where the plate-like structures are inclined and curved to redirect light at multiple angles. This curvature expands the incident angle region while the structures are formed through photo-induced self-organization during curing, avoiding the need for expensive precision equipment.
Solution Approach 2:
The internal structures form through self-organization during the UV curing process, where the polymerization reaction and phase separation automatically create the desired louver and columnar configurations with inherent curvature. This self-service formation mechanism eliminates the need for complex external equipment to impose curved shapes, reducing manufacturing complexity while maintaining structural stability.
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 film effectively expands the optical diffusion incident angle region while minimizing changes in optical diffusion characteristics with varying incident angles, reducing economic and stability issues, and preventing blurring or delamination.
Implementation Method 1
a composition for an optical diffusion film which contains a polymerizable compound and an ultraviolet absorber
Implementation Method 2
the content of the ultraviolet absorber is 0.01 part by weight or more and 2 parts by weight or less with respect to 100 parts by weight of the polymerizable compound
Implementation Method 3
a first internal structure and a second internal structure which each include a plurality of regions having a relatively high refractive index in a region having a relatively low refractive index
Implementation Method 4
optical diffusion films that can diffuse an incident light coming from a particular direction into particular directions
Data Source
AI summary
Provided are an optical diffusion film composed of a single layer, for which the optical diffusion incident angle region can be effectively expanded, and even when the incident angle of incident light is varied within the optical diffusion incident angle region, changes in the optical diffusion characteristics can be effectively suppressed; and a method for manufacturing the optical diffusion film.Disclosed is an optical diffusion film having, inside the film, a single optical diffusion layer having a first internal structure and a second internal structure, each of which include a plurality of regions having a relatively high refractive index in a region having a relatively low refractive index, sequentially from the lower part along the film thickness direction, and the regions having a relatively high refractive index in the first internal structure have a bent section at an intermediate point along the film thickness direction.