Light-Emitting Device With Segmented Luminance and Reflective Member
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Solution Overview
Problem
High-power light-emitting devices used in vehicles require improved light output efficiency and manufacturing methods to achieve a large difference in luminance between the inside and outside of the light exit surface, while existing solutions do not adequately address these needs.
Innovation Solution
A light-emitting device comprising a mounting board, a light-emitting element, a plate-shaped light-transmissive member, a light-reflective member, and a light-shielding frame with notches, where the light-reflective member is poured through the notches to form a light-guiding supporting member, enhancing light extraction efficiency and manufacturing ease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heat dissipation layer is formed to cover the periphery of the light-emitting surface, then heat dissipation characteristics are improved, but light output efficiency is reduced
Solution Approach 1:
The light exit surface is divided into multiple regions with different luminance characteristics. The central region has high luminance for efficient light output, while the peripheral region has lower luminance for heat dissipation. This segmentation allows simultaneous optimization of both light output efficiency and heat dissipation characteristics without compromising either function.
2Illumination intensity
If the light exit surface has uniform luminance, then light distribution is even, but the difference in luminance between inside and outside is small
Solution Approach 1:
Different regions of the light exit surface are assigned different optical properties. The central region is designed to emit high-luminance light for sharp-edged light distribution, while the peripheral region emits lower-luminance light. This local differentiation creates a large luminance difference between inside and outside of the light exit surface, achieving the desired sharp-edged characteristics while maintaining overall light distribution stability.
3Illumination intensity
If complex manufacturing processes are used to achieve sharp-edged light distribution, then light distribution characteristics are improved, but manufacturing complexity increases
Solution Approach 1:
Multiple functions are integrated into a single light exit surface structure. The light exit surface simultaneously serves as the light emission interface and the heat dissipation interface by creating different luminance regions. This merging eliminates the need for separate complex optical components or multi-step manufacturing processes, achieving sharp-edged light distribution through a simplified manufacturing approach.
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 increases the luminance difference between the inside and outside of the light exit surface, efficiently outputting light and simplifying the manufacturing process, making it suitable for vehicle lighting applications.
Implementation Method 1
a light-reflective member covering a lateral surface of the light-emitting element and a lateral surface of the light-transmissive member
Implementation Method 2
a plate-shaped light-transmissive member having: a first surface and a second surface facing a light-emitting surface of the light-emitting element
Implementation Method 3
a light-shielding frame on an upper surface of the light-reflective member around the light-transmissive member
Data Source
AI summary
A light-emitting device includes: a mounting board; a light-emitting element disposed on or above the mounting board; a plate-shaped light-transmissive member having: a first surface; and a second surface facing a light-emitting surface of the light-emitting element; a light-reflective member covering a lateral surface of the light-transmissive member; and a light-shielding frame on an upper surface of the light-reflective member around the light-transmissive member. The light-shielding frame has an opening. An inner perimeter of the opening is located apart from outer perimeters of the first surface and the second surface of the light-transmissive member in a top plan view. The light-reflective member is disposed between the inner perimeter of the opening and the outer perimeters of the light-transmissive member.