Light Diffusion Film Composition Expanding Aperture Angle
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Solution Overview
Problem
Existing light diffusion films obtained by photocuring compositions for anisotropic light diffusion films often exhibit insufficient angle of aperture for diffused light, depending on factors like photopolymerization initiator dosage, molecular weight of urethane (meth)acrylate, and coating layer temperature.
Innovation Solution
A composition comprising (meth)acrylic acid ester with plural aromatic rings, urethane (meth)acrylate, a photopolymerization initiator, and an ultraviolet absorber, where the components are adjusted within specific weight ratios to promote phase separation and bending of high refractive index regions, expanding the angle of aperture of diffused light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional compositions for anisotropic light diffusion films are used, then phase separation and internal structure formation can be achieved, but the angle of aperture of diffused light remains insufficient
Solution Approach 1:
The patent changes the chemical parameters of the composition by introducing specific components: a (meth)acrylic acid ester containing plural aromatic rings (component A) and a urethane (meth)acrylate (component B) with specific molecular weight and structure. These parameter changes enable both sufficient phase separation for internal structure formation and expanded angle of aperture of diffused light, resolving the contradiction between manufacturing precision and illumination intensity.
2Illumination intensity
If the content of component (A) is increased to expand angle of aperture, then light diffusion characteristics improve, but curing stability may be affected
Solution Approach 1:
The patent optimizes the content parameter of component (A) to within 25-400 parts by weight per 100 parts by weight of component (B), and component (C) content to 0.2-20 parts by weight per 100 parts by weight of total components (A) and (B). These parameter ranges ensure sufficient light diffusion while maintaining curing stability, resolving the contradiction between illumination intensity and reliability.
Solution Approach 2:
The patent introduces component (D) ultraviolet absorber as an intermediary substance to mediate between component (A) and component (B), helping to maintain curing stability even when component (A) content is increased to expand the angle of aperture. The ultraviolet absorber protects the system from excessive UV damage while allowing the desired light diffusion characteristics.
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 composition effectively expands the angle of aperture of diffused light in the resulting light diffusion film, enhancing its light diffusion characteristics without inhibiting curing, by incorporating a (meth)acrylic acid ester with specific structural features and a urethane (meth)acrylate, along with a photopolymerization initiator and ultraviolet absorber.
Implementation Method 1
a light diffusion film which can diffuse an incident light coming from a particular direction into particular directions, while directly transmitting an incident light coming from other directions. A variety of forms of such a light diffusion film are known; however, in particular, a light diffusion film having, within the film, a louver structure in which plural plate-shaped regions having different refractive indices are alternately arranged
Implementation Method 2
a light diffusion film having a predetermined internal structure can be obtained by curing the coating layer while subjecting the two or more kinds of polymerizable compounds in the coating layer to phase separation, by irradiating the coating layer with predetermined active energy radiation having a controlled direction of propagation
Implementation Method 3
a light diffusion film having, within the film, a louver structure in which plural plate-shaped regions having different refractive indices are alternately arranged in one arbitrary direction along the film plane
Data Source
AI summary
A composition for light diffusion film in which the angle of aperture of diffused light in a light diffusion film obtainable therefrom can be expanded effectively, and a light diffusion film obtainable by the composition for light diffusion film are provided.