Light Emitting Device Encapsulation for Heat Dissipation
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Solution Overview
Problem
Existing light emitting devices face challenges in heat dissipation and light reflection, leading to inefficiencies in thermal management and light output, particularly in compact designs.
Innovation Solution
A light emitting device configuration that includes a light emitting element, a wavelength converting material, and conductive and insulating members, where the wavelength converting material covers the light emitting element except for one face, and conductive members are strategically placed to enhance heat dissipation and light reflection, with an insulating member positioned to prevent short circuits and improve reflectance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the light emitting element is mounted on electrodes with conventional encapsulation, then the device structure is simple, but heat dissipation efficiency is poor
Solution Approach 1:
An insulating member with high thermal conductivity is introduced as an intermediary between the light emitting element and the electrode. This mediator enables efficient heat transfer from the light emitting element to the electrode while maintaining electrical insulation, thus resolving the contradiction between simple structure and heat dissipation efficiency
Solution Approach 2:
The patent changes the thermal conductivity parameter of the insulating member by selecting materials with high thermal conductivity (such as aluminum oxide or aluminum nitride). This parameter change allows the insulating member to effectively conduct heat while maintaining its electrical insulation function
2Device complexity
If the light emitting element is mounted on electrodes with conventional encapsulation, then the device structure is simple, but light reflection efficiency is poor
Solution Approach 1:
A reflective member is introduced as an intermediary between the light emitting element and the electrode. This mediator reflects light that would otherwise be lost downward, directing it toward the output surface, thus resolving the contradiction between simple structure and light reflection efficiency
Solution Approach 2:
The patent converts the harmful effect of light loss (light traveling downward into the electrode) into a beneficial effect by using the reflective member to redirect this light toward the output surface, thereby improving overall light extraction efficiency
3Volume of moving object
If compact design is implemented, then device size is reduced, but thermal management efficiency deteriorates
Solution Approach 1:
The patent uses thin film structures for the insulating member and reflective member, which maintain compact device volume while providing sufficient thermal and optical functionality. The thin film approach allows efficient heat dissipation and light reflection without adding significant volume
Solution Approach 2:
The patent employs composite material structures combining insulating and reflective properties in the insulating member (such as aluminum oxide or aluminum nitride ceramics). These composite materials provide both electrical insulation and high thermal conductivity in a single compact component
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 effective heat dissipation and efficient light reflection, resulting in improved thermal management and light output, making the device suitable for various applications including liquid crystal display backlights and lighting fixtures.
Implementation Method 1
a wavelength converting material... covers a whole of the light emitting element except for the first face
Implementation Method 2
conductive members are strategically placed to enhance heat dissipation
Implementation Method 3
an insulating member positioned to prevent short circuits
Implementation Method 4
conductive members are strategically placed to enhance... light reflection
Data Source
AI summary
A light emitting element includes a light emitting element having a first face on which a first electrode and a second electrode are provided. A wavelength converting material covers a whole of the light emitting element except for the first face such that a surface of the wavelength converting material and the first face constitute a substantially flat plane. A first electrically conductive material is provided on the first face and the surface of the wavelength converting material to be electrically connected to the first electrode. A second electrically conductive material is provided on the first face and the surface of the wavelength converting material to be electrically connected to the second electrode. An insulating member is disposed on the first electrically conductive material, the second electrically conductive material, and the first face between the first electrode and the second electrode.