Light-Emitting Device With Light-Guide Member For Color Mixing
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Solution Overview
Problem
Current light-emitting devices with multiple elements suffer from inadequate color mixing performance due to mismatched peak emission wavelengths and inefficient light extraction.
Innovation Solution
A light-emitting device design featuring a specific arrangement of light-emitting elements with different peak emission wavelengths, a light-guide member, a light-transmissive member, and reflective and inclined members to enhance color mixing and light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light-emitting elements with different peak emission wavelengths are arranged in a conventional configuration, then the device can emit multiple colors, but the color mixing performance is inadequate due to inefficient light extraction and mismatched wavelengths
Solution Approach 1:
The patent introduces a light-guide member with a specific refractive index positioned between the light-emitting elements and the light-transmissive member, adding an optical dimension to control light propagation. This light-guide member creates multiple internal reflections and refractions that enhance light extraction efficiency and improve color mixing by allowing light to travel through different paths and wavelengths to interact more effectively
Solution Approach 2:
The light-guide member acts as an intermediary optical element between the light-emitting elements and the light-transmissive member. This intermediary component with controlled refractive index mediates the light transmission process, enabling better color mixing by facilitating interaction between different wavelengths while maintaining manufacturing feasibility through standard optical material selection
2Illumination intensity
If light-emitting elements are closely arranged to improve light distribution, then color mixing may improve, but light extraction efficiency decreases due to optical interference and mismatched wavelengths
Solution Approach 1:
The light-guide member serves as an intermediary that resolves the conflict between close arrangement for uniform distribution and efficiency. By positioning this optical mediator between the closely-spaced light-emitting elements and the light-transmissive member, the system achieves uniform light distribution through controlled refraction and reflection while maintaining high extraction efficiency through optimized optical paths
Solution Approach 2:
The patent changes the optical parameters of the system by introducing a light-guide member with a specific refractive index value. This parameter change enables the system to maintain close arrangement of light-emitting elements for uniform distribution while compensating for optical interference through controlled refraction, thereby preserving light extraction efficiency
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 design improves color mixing performance and light extraction efficiency by aligning light-emitting elements with different peak wavelengths and using a light-guide member and reflective structures to optimize light distribution and reduce unevenness in emission color.
Implementation Method 1
a light-guide member covering the first element light extracting surface, the first element lateral surfaces, the second element light extracting surface, and the second element lateral surfaces
Implementation Method 2
a first reflective member surrounding the first light-emitting element, the second light-emitting element, and the light-guide member in a top view
Implementation Method 3
a light-transmissive member covering the first element light extracting surface and the second element light extracting surface such that a portion of the light-guide member is located between the light-transmissive member and each of the first element light extracting surface and the second element light extracting surface
Implementation Method 4
a first inclined member disposed between the first light-emitting element and the first reflective member in the longitudinal direction and having an inclined surface inclined relative to the light-transmissive member
Data Source
AI summary
A light-emitting device has a longitudinal direction and a width direction perpendicular to the longitudinal direction, and includes a first light-emitting element, a second light-emitting element having a peak emission wavelength different from a peak emission wavelength of the first light-emitting element and being aligned with the first light-emitting element in the longitudinal direction, a light-transmissive member covering a first element light extracting surface and a second element light extracting surface such that a portion of a light-guide member is located between the light-transmissive member and each of the first element light extracting surface and the second element light extracting surface, a first reflective member surrounding the first light-emitting element, the second light-emitting element, and the light-guide member in a top view, and a first inclined member between the first light-emitting element and the first reflective member in the longitudinal direction and having an inclined surface inclined relative to the light-transmissive member. The first inclined member is spaced apart from the light-transmissive member.