Bent Columnar Light Diffusion Film for Wide Aperture
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Solution Overview
Problem
Anisotropic light diffusion films exhibit sharp switching in diffusion conditions between light diffusion and non-light diffusion incident angles, and the angle of aperture of diffused light is insufficient due to the limitations of existing columnar and louver structures.
Innovation Solution
A light diffusion film with a bent columnar structure formed by pillar-shaped objects having a high refractive index, where the angle of inclination and length of the pillar-shaped objects are adjusted to expand the angle of aperture of diffused light, and a method involving a composition with (meth)acrylic acid ester, urethane (meth)acrylate, photopolymerization initiator, and ultraviolet absorber is used to stabilize this structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional columnar structure or louver structure is used in the light diffusion film, then the film can transmit straight incident light from particular directions, but the angle of aperture of diffused light is insufficient
Solution Approach 1:
The patent applies curvature by introducing bent columnar structures instead of straight columns. The pillar-shaped objects are configured with bent portions that have predetermined curvatures, allowing light to be diffused over a wider angular range. This curved geometry enables the light diffusion film to expand the angle of aperture of diffused light effectively while maintaining the columnar arrangement for directional control.
2Ease of operation
If a louver structure with plate-shaped regions is used, then light diffusion can be achieved for incident light from particular directions, but sharp switching occurs between light diffusion and non-light diffusion incident angle regions
Solution Approach 1:
The bent columnar structure with curved portions provides gradual light diffusion transitions instead of sharp switching. The curvature of the bent portions allows light rays to be redirected smoothly across a continuous angular range, eliminating the abrupt transitions characteristic of louver structures while maintaining effective light diffusion control.
3Ease of manufacture
If straight pillar-shaped objects are arranged in a columnar structure, then the structure can be formed by phase separation of polymerizable compounds, but the angle of aperture of diffused light remains limited
Solution Approach 1:
The patent introduces bent portions with predetermined curvatures in the pillar-shaped objects while maintaining the columnar arrangement. This curved geometry is achieved through the phase separation of polymerizable compounds during photocuring, where the composition design enables the formation of bent structures that effectively expand the angle of aperture of diffused light without compromising manufacturability.
4Device complexity
If the columnar structure has uniform pillar shapes throughout, then the manufacturing process is simplified, but the light diffusion performance and angle of aperture are insufficient
Solution Approach 1:
The patent applies local quality by introducing bent portions with predetermined curvatures at specific locations within the pillar-shaped objects. The columnar structure maintains overall uniformity for manufacturing simplicity, while local variations in the form of bent portions with specific curvatures enhance light diffusion performance and expand the angle of aperture in critical regions.
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 bent columnar structure effectively expands the angle of aperture of diffused light and enhances the uniformity of light intensity within the diffusion angle region, reducing sharp switching and improving light diffusion performance.
Implementation Method 1
a step of preparing a composition for light diffusion film which includes a (meth)acrylic acid ester containing plural aromatic rings as component (A); a urethane (meth)acrylate as component (B); a photopolymerization initiator as component (C)
Implementation Method 2
an ultraviolet absorber as component (D)
Implementation Method 3
a light diffusion film having a columnar structure in which plural pillar-shaped objects having a relatively high refractive index are arranged to stand close together in a region having a relatively low refractive index
Implementation Method 4
the angle of aperture of diffused light has been expanded effectively by having, within the film, a predetermined columnar structure formed from pillar-shaped objects having a bent part
Data Source
AI summary
A light diffusion film in which the angle of aperture of diffused light has been expanded effectively by forming, within the film, a predetermined columnar structure composed of pillar-shaped objects having a bent part and a region having a relatively low refractive index, and a method for manufacturing the light diffusion film are provided. Disclosed is a light diffusion film having a columnar structure in which plural pillar-shaped objects having a relatively high refractive index are arranged to stand close together in the film thickness direction in a region having a relatively low refractive index, and the plural pillar-shaped objects having a relatively high refractive index have a bent part in the middle of the pillar-shaped objects.