Wavelength-Converting Light Structure for Long-Distance Visibility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing light emitting devices for vehicle headlights and interior lighting lack effective visibility due to inefficient light distribution and absorption, particularly in high beam applications.
Innovation Solution
A light emitting device design incorporating a wavelength converting member with specific geometric configurations and a light-shielding film, along with a method of manufacturing that involves masking, singulation, and thickness reduction, to optimize light extraction and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional wavelength converting member with uniform thickness is used, then the structure is simple and easy to manufacture, but light distribution is inefficient and visibility is poor
Solution Approach 1:
The wavelength converting member employs varying thickness across different regions - thinner at the first upper surface area and thicker at the second upper surface area. This local variation in thickness optimizes light extraction efficiency at each region, allowing better control over light distribution and visibility without requiring completely different structural designs
Solution Approach 2:
The wavelength converting member is divided into distinct functional zones with different thickness characteristics - a first region with reduced thickness for enhanced light extraction and a second region with greater thickness for structural support and additional wavelength conversion. This segmentation allows each zone to perform its specific function optimally
2Illumination intensity
If light-shielding films and covering members are added to improve light distribution, then visibility and luminance are enhanced, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The light-shielding film is applied to the second upper surface and lateral surfaces before final assembly, and the covering member is positioned to cover lateral surfaces. These protective and functional layers are integrated into the manufacturing sequence rather than added as separate post-processing steps, streamlining the overall manufacturing process
Solution Approach 2:
The light-shielding film and covering member functions are combined with the wavelength converting member structure itself. The varying thickness design of the wavelength converting member works synergistically with the light-shielding film and covering member to achieve both protection and optimized light distribution in a unified structure
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 enhances light emission intensity and visibility by concentrating light on the first upper surface and lateral surfaces of the wavelength converting member, reducing light leakage and improving luminance for longer distances.
Implementation Method 1
a wavelength converting member including a first upper surface and a second upper surface, a lower surface located at an opposite side from the first upper surface and the second upper surface
Data Source
AI summary
The light emitting device includes: at least one light emitting element including a light-extracting surface and at least one lateral surface; a wavelength converting member including; a first upper surface and a second upper surface, a lower surface located at an opposite side from the first upper surface and the second upper surface, at least one first lateral surface connecting the second upper surface and the first upper surface, and at least one second lateral surface connecting the second upper surface and the lower surface, in which a thickness between the lower surface and the first upper surface is smaller than a thickness between the lower surface and the second upper surface, and the first upper surface is located at an opposite side from the light-extracting surface of a corresponding one of the at least one light emitting element, and the lower surface is located facing the light-extracting surface of the corresponding one of the at least one light emitting element; a covering member covering the at least one second lateral surface of the wavelength converting member and the at least one lateral surface of the light emitting element; and a light-shielding film covering the second upper surface of the wavelength converting member.