Wavelength-Selective Optical Member for Compact Light Mixing
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Solution Overview
Problem
Existing light-emitting devices using semiconductor elements lack compactness and efficient light output control, as they typically require separate components for wavelength conversion and emission, leading to complexity in optical design and reduced efficiency.
Innovation Solution
A light-emitting device comprising a first light-emitting element for wavelength conversion, a second light-emitting element for emission, and an optical member with a wavelength conversion member that reflects the first emission light and transmits the wavelength-converted light, allowing for compact design and controlled light output by a single optical member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If separate components are used for wavelength conversion and emission, then wavelength conversion and emission can be performed independently, but device complexity increases and compactness is reduced
Solution Approach 1:
The patent combines the wavelength conversion function and emission function into a single integrated light-emitting device structure. The first light-emitting element (wavelength conversion) and second light-emitting element (emission) are integrated with a shared substrate and electrical connection structure, eliminating the need for separate components and reducing overall device complexity while maintaining functional independence.
Solution Approach 2:
The substrate serves multiple functions simultaneously: it provides mechanical support for both light-emitting elements, acts as an electrical connection path, and serves as a mounting platform for the optical member. This multi-functionality reduces the number of separate components needed, thereby improving compactness without sacrificing operational independence.
2Reliability
If separate components are used for wavelength conversion and emission, then each component can be optimized independently, but the number of components increases reducing compactness
Solution Approach 1:
The patent implements a nested structure where the first light-emitting element and second light-emitting element are arranged on the same substrate in a space-efficient manner. The optical member is positioned to receive light from both elements, creating a compact nested arrangement that allows independent optimization of each element while minimizing overall device volume.
3Volume of moving object
If one optical member controls light output from multiple light-emitting elements, then device compactness is improved, but the optical design becomes more challenging
Solution Approach 1:
The optical member is designed with wavelength-selective optical properties, where different regions or layers of the optical member handle different wavelength ranges from the first and second light-emitting elements. This local differentiation allows the single optical member to effectively manage light from multiple sources without requiring complex overall design, as each local region is optimized for its specific function.
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 enables a compact light-emitting device with improved light output control, allowing for efficient emission of mixed-color light, enhancing emission efficiency and simplifying optical design by separating wavelength ranges for reflection and transmission.
Implementation Method 1
The optical action layer is configured to reflect the first emission light and the second emission light so that the first emission light and the second emission light do not pass through the optical action layer
Implementation Method 2
The wavelength conversion member is configured to receive the first emission light reflected by the optical action layer of the optical member, to convert a wavelength of the first emission light, and to emit a wavelength-converted light having a converted wavelength
Implementation Method 3
The optical action layer of the optical member is configured to transmit the wavelength-converted light
Data Source
AI summary
A light-emitting device includes first and second light-emitting elements, an optical member, and a wavelength conversion member. The optical member includes an optical action layer configured to reflect or transmit light in accordance with a wavelength of the light. The optical action layer is configured to reflect first emission light emitted from the first light-emitting element and second emission light emitted from the second light-emitting element. The wavelength conversion member is configured to receive the first emission light reflected by the optical action layer of the optical member, to convert a wavelength of the first emission light, and to emit a wavelength-converted light having a converted wavelength. The optical action layer of the optical member is configured to transmit the wavelength-converted light. The optical member is arranged so that the wavelength-converted light and the second emission light are emitted from an upward-facing surface of the optical action layer.