Light-Emitting Device With Dual-Region Transmissive Member
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Solution Overview
Problem
Existing light-emitting devices for vehicle lamps, such as headlights, lack the ability to create distinct high-luminance and low-luminance regions without complex optical designs, which complicates light distribution and hinders miniaturization and design flexibility.
Innovation Solution
A light-emitting device comprising a light-transmissive member with a first light-transmissive portion containing phosphor particles and a second light-transmissive portion containing light-diffusing particles, where the second portion has a relative density of 70% to 95%, allowing for controlled luminance and chromaticity adjustments through the use of phosphor and light-diffusing particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex optical designs are used to create distinct high-luminance and low-luminance regions, then light distribution capability is improved, but device complexity increases and miniaturization is hindered
Solution Approach 1:
The light-transmissive member is divided into multiple regions with different properties: a first light-transmissive portion with high light transmittance for high-luminance regions, and a second light-transmissive portion with low light transmittance for low-luminance regions. This local differentiation of material properties enables distinct luminance regions without complex optical designs.
Solution Approach 2:
The light-transmissive member uses composite materials containing phosphor particles and light-diffusing particles with specific relative density (70-95%). The combination of these materials with controlled density creates regions with different light transmission characteristics, enabling luminance control through material composition rather than complex optical structures.
2Adaptability or versatility
If multiple light-transmissive portions with different densities are used, then luminance control is improved, but manufacturing precision requirements increase
Solution Approach 1:
The invention controls the relative density of the light-diffusing particles within the range of 70-95%, and adjusts the content ratio of phosphor particles to light-diffusing particles. By changing these material parameters within specified ranges, different luminance regions are achieved without requiring extremely precise manufacturing tolerances.
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
Enables the creation of a high-luminance and low-luminance region in the emission surface without complex optical designs, facilitating desired light distribution, miniaturization, and enhanced design flexibility for vehicle headlights.
Implementation Method 1
a first light-transmissive portion (11) including a first sintered body (11a) containing a phosphor particle
Implementation Method 2
a second light-transmissive portion (12) including a second sintered body (12a) containing a light-diffusing particle
Data Source
AI summary
A light-emitting device includes a light-emitting element and a plate-shaped light-transmissive member. The plate-shaped light-transmissive member is disposed on or above the light-emitting element. The light-transmissive member has a lower surface configured to receive light emitted from the light-emitting element and an upper surface opposite to the lower surface. The upper surface of the light-transmissive member serves as an emission surface. The light-transmissive member includes a first light-transmissive portion including a first sintered body containing a phosphor particle, and a second light-transmissive portion including a second sintered body containing a light-diffusing particle. The second sintered body has a relative density of 70% or more and 95% or less. The emission surface includes a first light-emitting region configured to emit light through the first light-transmissive portion, and a second light-emitting region configured to emit light through the second light-transmissive portion at a lower luminance than in the first light-emitting region.