Light Diffusion Film T/t Ratio for Elongation Stability
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Solution Overview
Problem
LED lighting apparatuses require a light diffusion film with a wide half-value angle to achieve satisfactory light diffusivity, but existing films experience a decrease in half-value angle when shaped with high elongation rates, particularly in curved surfaces or high elongation rates.
Innovation Solution
A light diffusion film with a light diffusing layer containing light diffusing particles and a resin binder, where the ratio of average film thickness to average particle diameter (T/t) is 3.0 or more, maintaining the half-value angle even after high elongation rate processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a light diffusion film is shaped with high elongation rate to meet design freedom requirements, then the film can be formed into curved surfaces and new shapes, but the half-value angle decreases and light diffusion performance deteriorates
Solution Approach 1:
The patent changes the physical parameters of the light diffusing particles (size distribution, refractive index) and the resin binder properties to create a formulation that maintains light diffusion performance after elongation. Specifically, using particles with average diameter of 0.5-10.0 μm and controlling the T/t ratio to be 3.0 or more ensures that the optical properties are preserved even when the film is stretched at high elongation rates.
Solution Approach 2:
The patent creates a composite material system consisting of light diffusing particles dispersed in a resin binder matrix. This composite structure allows the film to simultaneously achieve mechanical deformability (for shaping) and optical functionality (light diffusion). The specific composition with 30-80 wt% light diffusing particles in the light diffusing layer provides both the required shape adaptability and maintains light diffusion performance after processing.
2Illumination intensity
If a light diffusion film uses high haze to achieve light diffusion, then the film shows high light scattering, but the half-value angle is not sufficient for LED lighting apparatuses
Solution Approach 1:
The patent optimizes the particle size parameter (average diameter t of 0.5-10.0 μm) and the film thickness parameter (T) to achieve the desired half-value angle. By controlling the T/t ratio to be 3.0 or more, the patent ensures that the light diffusion characteristics produce a sufficiently wide half-value angle for LED lighting applications, while maintaining appropriate light scattering through the use of light diffusing particles with specific refractive index differences from the resin binder.
3Shape
If a light diffusion film is elongated to accommodate curved surfaces, then the film can fit complex shapes, but the half-value angle decreases easily even with slight haze decrease
Solution Approach 1:
The patent incorporates light diffusing particles with specific properties (size, refractive index) into the resin binder before film formation. This preliminary preparation ensures that the light diffusion network is established in advance, so that even when the film is subsequently elongated to fit curved surfaces, the half-value angle is maintained. The pre-formed composite structure resists degradation of optical performance during later shaping operations.
Solution Approach 2:
The patent uses light diffusing particles with average diameter of 0.5-10.0 μm and controls the T/t ratio to be 3.0 or more, which provides a buffer against the effects of elongation. This parameter optimization ensures that even when the film is stretched to accommodate curved surfaces, the light diffusion performance and half-value angle remain stable and do not decrease easily.
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 proposed light diffusion film effectively suppresses the decrease in half-value angle after processing with high elongation rates, ensuring consistent light diffusivity and performance.
Implementation Method 1
a light diffusion film including a base material film and a light diffusing layer, the light diffusing layer containing light diffusing particles and a resin binder
Data Source
AI summary
There is provided a light diffusion film in which a decrease in the half-value angle can be suppressed even after processing with a high elongation rate. A light diffusion film including a base material film and a light diffusing layer, the light diffusing layer containing light diffusing particles and a resin binder, wherein a ratio (T/t) of an average film thickness T of the light diffusing layer, to an average particle diameter t of the light diffusing particles, is 3.0 or more.