Light Diffuser Non-Linear Particle Concentration
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Solution Overview
Problem
Existing light diffusers using the edge incidence system face challenges in achieving uniform brightness and hue, particularly when applied to larger areas, as the increased light guiding distance leads to brightness and color unevenness, and there is a lack of specific guidelines for particle concentration distribution for target brightness or product size.
Innovation Solution
A light diffuser with a non-linear and continuous or discontinuous increase in light scattering particle concentration from the incident edge, either through a laminated structure of diffusing films or a structure with a predetermined curved surface shape, to control brightness and hue uniformity, and a method of manufacturing involving the dispersion and joining of light scattering layers with varying particle concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the light guiding distance is increased to expand the display or lighting area, then the area of the emission surface is improved, but brightness unevenness and color unevenness occur
Solution Approach 1:
The patent applies local quality by varying the concentration of light scattering particles at different positions within the light diffuser. Specifically, the particle concentration is set to increase non-linearly from the incident edge toward the emission surface, creating localized differences in scattering intensity that compensate for the increased light guiding distance and maintain uniform brightness across the expanded emission area.
Solution Approach 2:
The patent implements parameter changes by modifying the concentration parameter of light scattering particles throughout the light diffuser medium. The concentration is not uniform but follows a non-linear distribution pattern, increasing from the incident edge, which changes the optical parameters locally to achieve uniform light emission across the entire emission surface despite variations in light guiding distance.
2Area of stationary object
If the light guiding distance is increased to expand the display or lighting area, then the area of the emission surface is improved, but color unevenness occurs
Solution Approach 1:
The patent addresses color uniformity by applying local quality through spatially varying particle concentration. Different regions of the light diffuser contain different concentrations of light scattering particles, with higher concentrations positioned to compensate for regions where light travels longer distances, thereby maintaining consistent hue across the entire emission surface.
Solution Approach 2:
The patent resolves color unevenness by changing the concentration parameter of light scattering particles non-uniformly throughout the medium. This parameter variation ensures that regions with longer light guiding paths have higher particle concentrations, compensating for light attenuation and maintaining uniform color characteristics across the expanded emission area.
3Illumination intensity
If the number per unit area of light scattering particles is increased to equalize light intensity, then the brightness uniformity is improved, but the particle concentration distribution becomes complex
Solution Approach 1:
The patent manages the complexity of particle concentration distribution by defining a specific non-linear increase pattern from the incident edge. Rather than requiring complex multi-dimensional variations, the concentration follows a systematic non-linear gradient, which simplifies manufacturing while achieving the desired brightness uniformity across the emission surface.
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 enables improved uniformity in brightness and hue on the emission surface of the light diffuser, addressing the issues of brightness and color unevenness, and allows for easier control and manufacturing of light diffusers with specific brightness or hue distributions.
Implementation Method 1
a light diffuser to receive first light and emit scattered light, the light diffuser including: an incident surface to receive the first light; a light scattering portion including light scattering particles present in a medium, the light scattering portion generating the scattered light by guiding the received first light and scattering the received first light with the light scattering particles
Data Source
AI summary
Provided are a light diffuser in which the brightness or hue in an emission surface of the light diffuser is controlled, a lighting device, and a method of manufacturing such a light diffuser.A light diffuser (100) includes: an incident surface (121) to receive first light (Li); a light scattering portion (110) that includes light scattering particles (112) present in a medium (111) and generates scattered light by guiding the received first light and scattering the received first light with the light scattering particles; and an emission surface (122) to emit the scattered light, wherein a concentration of the light scattering particles in the light scattering portion is distributed such that the concentration increases non-linearly and continuously or discontinuously with distance from an incident edge in a light guiding direction of the first light in the light scattering portion.