Phosphor Layer Patterning With Diffusion Control in Vehicle Lighting
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Solution Overview
Problem
Conventional vehicle lighting devices using phosphor layers for pattern formation face challenges in light efficiency due to variations in phosphor layer thickness, which affect light diffusion and aesthetics, especially when concave or protruding patterns are formed.
Innovation Solution
A lighting device design featuring a substrate with light sources, a resin layer, a phosphor layer, and a diffusion layer between the resin and phosphor layers, where the diffusion layer's thickness is strategically adjusted to enhance light emission and maintain aesthetic appeal by controlling phosphor concentration and pattern formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a concave pattern is formed on the surface of the phosphor layer, then a three-dimensional effect and aesthetic sense are improved, but the thickness of the phosphor layer decreases and light diffusion is prevented
Solution Approach 1:
A resin layer is introduced as an intermediary between the light source and the phosphor layer. This resin layer fills the concave portions of the phosphor layer pattern, ensuring that light passes through a uniform thickness of resin before reaching the phosphor. This mediator allows the phosphor layer to maintain its concave aesthetic pattern while preventing light diffusion issues caused by variable phosphor thickness.
2Illumination intensity
If a protruding pattern is formed on the surface of the phosphor layer, then light diffusion is improved, but the thickness of the phosphor layer increases and light efficiency is deteriorated
Solution Approach 1:
The resin layer acts as a mediator that allows the phosphor layer to have protruding portions for light diffusion while maintaining overall uniform light transmission. The resin fills the spaces around the protrusions and provides a consistent optical path, preventing excessive light efficiency loss despite the increased phosphor layer thickness in protruding regions.
Solution Approach 2:
The phosphor layer is designed with local variations in thickness - protruding portions in certain areas to enhance light diffusion, and the resin layer compensates locally by filling spaces to maintain overall optical uniformity. This local quality approach allows targeted light diffusion enhancement without compromising overall light efficiency.
3Illumination intensity
If the phosphor layer thickness is increased to maintain color expression, then color quality is improved, but light efficiency is deteriorated
Solution Approach 1:
The resin layer serves as an intermediary optical medium that allows the phosphor layer to maintain sufficient thickness for color expression while managing light transmission. The resin's optical properties help maintain uniform light paths, ensuring that increased phosphor thickness does not proportionally increase light efficiency loss.
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 improves light efficiency and maintains aesthetic design by optimizing the diffusion layer's thickness and phosphor concentration, preventing light loss and enhancing the 3D pattern effect without increasing the device's thickness.
Implementation Method 1
a diffusion layer disposed between the resin layer and the phosphor layer
Implementation Method 2
a phosphor layer disposed on the resin layer
Data Source
AI summary
A lighting device disclosed in an embodiment of the invention includes a substrate; a plurality of light sources spaced apart from each other at predetermined intervals on the substrate; a resin layer disposed on the substrate; a phosphor layer disposed on the resin layer and having a pattern layer including a concave portion and a convex portion formed on a surface facing the resin layer; and a diffusion layer disposed between the resin layer and the phosphor layer, wherein a thickness of the diffusion layer may be 10% or more and less than 50% of the maximum thickness of the phosphor layer.