Rectangular Light-Emitting Structure for Sharp Headlamp Cut-Off
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Solution Overview
Problem
Existing light-emitting devices for vehicle headlamps face challenges in providing a clear cut-off line in low beam mode while maintaining a compact optical system, as the large wavelength conversion member increases the light-emitting surface area, making it difficult to achieve both high luminance and safety through a simple and small optical system.
Innovation Solution
A light-emitting device with a rectangular light-emitting surface and a plate-shaped light-transmissive member is designed, where the light-transmissive member is positioned such that one side is outside and the other side is inside the light-emitting element's surface, creating a sharp luminance difference between the outer and inner sides of the boundary, allowing for a clear cut-off line with a reduced light-emitting surface area and a simpler optical system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a large wavelength conversion member is disposed on light-emitting elements such that the periphery is located outside the light-emitting surfaces, then a clear cut-off line is achieved, but the light-emitting surface area becomes large
Solution Approach 1:
The patent divides the wavelength conversion member into multiple segments: a first wavelength conversion member disposed on the light-emitting elements and a second wavelength conversion member disposed on the frame. This segmentation allows each segment to be optimized independently, achieving clear cut-off lines without requiring a single large wavelength conversion member that would increase the overall light-emitting surface area.
Solution Approach 2:
The patent applies different properties to different parts of the system. The first wavelength conversion member has specific optical properties optimized for light conversion, while the frame provides structural support and positioning. This local differentiation allows the cut-off line clarity to be achieved through the coordinated arrangement of components with specialized local functions, rather than uniformly enlarging the entire light-emitting surface.
2Reliability
If the light-emitting surface area is enlarged to provide clear cut-off line, then safety is improved, but the optical system size increases
Solution Approach 1:
The patent nests the first wavelength conversion member within the frame structure, and positions the second wavelength conversion member on the frame. This nested arrangement allows the wavelength conversion members to be integrated within the existing optical system boundaries rather than requiring additional external space, thereby maintaining safety through clear cut-off lines without increasing the overall optical system volume.
3Manufacturing precision
If a large wavelength conversion member is used to ensure clear boundary, then cut-off line clarity is improved, but device complexity increases
Solution Approach 1:
The frame serves multiple functions: it provides structural support, positions the first wavelength conversion member, and carries the second wavelength conversion member. This multi-functionality eliminates the need for separate components for each function, reducing device complexity while maintaining clear boundary clarity through the coordinated arrangement of the wavelength conversion members.
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
This configuration enables a clear cut-off line in low beam mode while minimizing the optical system's size, enhancing safety and luminance characteristics without increasing the light-emitting surface area, thus providing a more efficient and compact headlight solution.
Implementation Method 1
at least one light-emitting element on or above the substrate, the at least one light-emitting element having an upper surface serving as a light-emitting surface
Implementation Method 2
a plate-shaped light-transmissive member having a lower surface that faces the upper surface of the at least one light-emitting element
Data Source
AI summary
A light-emitting device includes: a substrate having an upper surface; at least one light-emitting element on or above the substrate, the at least one light-emitting element having a rectangular shape in a plan view from above the light-emitting device and having an upper surface serving as a light-emitting surface of the at least one light-emitting element; a plate-shaped light-transmissive member having a rectangular shape in a plan view from above the light-emitting device and having a lower surface that faces the upper surface of the at least one light-emitting element; and a light-guiding member that is disposed between the light-emitting element and the light-transmissive member.