Light-Emitting Device Lateral Surface Wavelength Conversion
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Solution Overview
Problem
Existing light-emitting devices with wavelength conversion members face inefficiencies in wavelength conversion due to limited surface area interaction between the light-emitting elements and wavelength conversion members, leading to suboptimal light utilization and color temperature directivity.
Innovation Solution
A light-emitting device design incorporating a light-emitting element, a wavelength conversion member with an incident surface larger than the light-emitting surface, a light-transmissive member that covers the lateral surfaces of the light-emitting element, and a light-reflective member to enhance light guidance and reflection, along with a manufacturing method involving the application and curing of resin materials to form these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the wavelength conversion member is disposed to face only the light-emitting surface of the light-emitting element, then the structure is simple, but the wavelength conversion efficiency is low due to limited surface area interaction
Solution Approach 1:
The patent extends the interaction surface from two-dimensional (light-emitting surface only) to three-dimensional by having the light-transmissive member wrap around and contact the lateral surfaces of the light-emitting element. This dimensional expansion allows the wavelength conversion member to receive light from multiple surfaces, significantly increasing the effective conversion area while maintaining structural feasibility through the wrapping configuration
2Productivity
If the wavelength conversion member has an incident surface larger than the light-emitting surface, then the wavelength conversion efficiency improves, but the device complexity increases due to additional light guidance structures
Solution Approach 1:
The light-transmissive member serves multiple functions simultaneously: it acts as a light guide to direct light from the light-emitting surface to the wavelength conversion member, serves as a structural support to hold the wavelength conversion member in position, and provides optical coupling between the light-emitting element and wavelength conversion member. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity
Solution Approach 2:
The light-transmissive member acts as an intermediary between the light-emitting element and the wavelength conversion member, facilitating light transfer and enabling the wavelength conversion member to have a larger incident surface without directly contacting the light-emitting element. This intermediary structure simplifies the overall design compared to direct coupling arrangements
3Productivity
If the light-transmissive member covers the lateral surfaces of the light-emitting element, then more light is guided to the wavelength conversion member, but the manufacturing precision requirements increase
Solution Approach 1:
The patent changes the physical state of the light-transmissive material from liquid resin to cured solid state, utilizing the phase change during curing to achieve precise positioning. The material is applied in a fluid state that allows it to conform to surfaces, then cured to lock in the precise alignment, thereby reducing final assembly precision requirements while maintaining high light guidance 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 enables efficient wavelength conversion across a wider area, increasing luminance and reducing color temperature directivity by guiding light from both the light-emitting surface and lateral surfaces to the wavelength conversion member, thereby improving the utilization efficiency of the wavelength conversion member.
Implementation Method 1
a light-transmissive member that includes a first portion disposed across a lateral surface of the light-emitting element and the incident surface of the wavelength conversion member
Implementation Method 2
a light-reflective member disposed to cover the lateral surface of the light-emitting element while being in contact with the first portion of the light-transmissive member
Implementation Method 3
a wavelength conversion member having an incident surface that is larger than the light-emitting surface of the light-emitting element
Implementation Method 4
applying a light-transmissive resin material on a wavelength conversion sheet; curing the light-transmissive resin material
Data Source
AI summary
A light-emitting device efficiently performs wavelength conversion and includes a light-emitting element having a light-emitting surface, a wavelength conversion member having an incident surface that is larger than the light-emitting surface of the light-emitting element, a light-transmissive member that includes a first portion disposed across a lateral surface of the light-emitting element and the incident surface of the wavelength conversion member, and a light-reflective member disposed to cover the lateral surface of the light-emitting element while being in contact with the first portion of the light-transmissive member. The incident surface of the wavelength conversion member faces the light-emitting surface of the light-emitting element and has an outer periphery located outward of an outer periphery of the light-emitting surface. The light-transmissive member further includes a second portion that extends from an end portion of the first portion between the light-reflective member and the incident surface of the wavelength conversion member.