Light Diffusion Film Indentation Elastic Modulus
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Solution Overview
Problem
Conventional light diffusion films are prone to dents and collapse during manufacturing and lamination, which affects the performance of optical devices like liquid crystal display devices.
Innovation Solution
A light diffusion film with an internal structure comprising regions of high refractive index in a low refractive index region, featuring an indentation elastic modulus of 30 MPa or more at 23°C, and a tensile elastic modulus of 1 MPa or more and 500 MPa or less, which suppresses dents and collapse during manufacturing and lamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional light diffusion films are used, then light diffusion function is provided, but dents and collapse occur during manufacturing and lamination
Solution Approach 1:
The patent changes the physical parameter of indentation elastic modulus to a specific range (30-500 MPa at 23°C) to resolve the contradiction between structural stability and surface flatness. This parameter optimization prevents dents during manufacturing while avoiding collapse during lamination, maintaining both reliability and manufacturing precision.
Solution Approach 2:
The patent uses composite material composition comprising specific compounds (polyester diol, polyether diol, isocyanate compound, and (meth)acrylate compound) to achieve the desired indentation elastic modulus range. The composite structure provides both the mechanical stability needed to prevent dents and the flexibility required to avoid collapse during lamination.
2Object-affected harmful factors
If the film is made softer to prevent dents, then dent occurrence is reduced, but collapse occurs during lamination
Solution Approach 1:
The patent optimizes the indentation elastic modulus within a specific range (30-500 MPa) to balance dent prevention and collapse resistance. This parameter control ensures the film is soft enough to prevent dents during manufacturing while maintaining sufficient strength to resist collapse during lamination processes.
3Strength
If the film is made harder to prevent collapse, then resistance to collapse is improved, but dent occurrence increases during manufacturing
Solution Approach 1:
The patent establishes the indentation elastic modulus within the optimal range of 30-500 MPa to resolve the contradiction between collapse resistance and dent prevention. This controlled hardness provides sufficient strength to prevent collapse during lamination while remaining soft enough to avoid dent formation during manufacturing.
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 reduces the occurrence of dents and collapse, ensuring desired light diffusivity and performance in optical devices.
Implementation Method 1
The internal structure includes a plurality of regions having a relatively high refractive index in a region having a relatively low refractive index
Implementation Method 2
the use of a light diffusion film is studied. When light in a specific direction is incident on the light diffusion film, it can strongly diffuse the incident light in a specific direction
Data Source
AI summary
A light diffusion film having an internal structure in the film. The internal structure includes a plurality of regions having a relatively high refractive index in a region having a relatively low refractive index. The light diffusion film has an indentation elastic modulus of 30 MPa or more at 23° C.