Resin Film Light Diffusion Layer Gradient for Laminated Glass
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Solution Overview
Problem
Laminated glass used as a transparent screen experiences unnecessary light-scattering at the boundary between the display region and other regions, leading to reduced viewability due to the presence of light-diffusible particles.
Innovation Solution
A resin film with a light diffusion layer comprising thermoplastic resin and light diffusion particles, where the thickness of the light diffusion layer decreases gradually from one end to the other, with a gradient of 0.9 mrad or less within 10% of the end, is used between two sheets of clear glass, optimizing the ratio of transmitted light intensities across different wavelengths to minimize scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a light diffusion layer containing light diffusion particles is provided in the resin film to enable image display, then image display function is achieved, but unnecessary light scattering occurs at the boundary between display region and other regions, causing white lines and reduced viewability
Solution Approach 1:
The light diffusion layer is designed with spatially varying thickness, being thicker in the display region and thinner at the boundary region. This local variation in thickness allows the light diffusion particles to be effectively distributed only where needed for image display, while minimizing their presence at boundaries where they cause harmful light scattering and white lines.
Solution Approach 2:
The resin film is segmented into distinct functional regions: a display region containing the light diffusion layer with light diffusion particles for image projection, and a boundary region with reduced light diffusion particle content. This segmentation allows the display function and boundary clarity to be optimized independently.
2Illumination intensity
If light diffusion particles are distributed throughout the resin film to improve light diffusion for image display, then image visibility is enhanced, but transmittance is reduced and color distortion occurs
Solution Approach 1:
The light diffusion particles are concentrated in the display region where they are needed for image visibility, while their concentration is reduced in non-display regions. This localized distribution maintains high light diffusion performance where required while preserving light transmittance in regions where diffusion is not needed.
Solution Approach 2:
Instead of uniformly distributing light diffusion particles throughout the entire resin film, the invention applies light diffusion particles partially - specifically in the display region only. This partial action achieves the necessary light diffusion for image display without the excessive light scattering that would occur with full-area distribution.
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 solution effectively prevents unnecessary light-scattering, enhancing viewability by maintaining favorable transmittance and haze values, ensuring clear image display without white lines or brightness distortions.
Implementation Method 1
a light diffusion layer comprising a thermoplastic resin and a light diffusion particle, wherein the light diffusion layer is placed in the transparent resin layer
Data Source
AI summary
A resin film comprising a transparent resin layer comprising a thermoplastic resin, and a light diffusion layer comprising a thermoplastic resin and a light diffusion particle, in which the light diffusion layer is placed in the transparent resin layer, and the thickness of the light diffusion layer decreases from one end of the light diffusion layer toward other end opposite to the one end in one direction perpendicular to a thickness direction of the resin film, and a gradient of the thickness of the light diffusion layer is 0.9 mrad or less in a region located within 10% from the other end provided that a distance from the one end to the other end is 100%.