Light-Emitting Element Layout for Thermal Stability and Light Extraction
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Solution Overview
Problem
Existing light-emitting devices lack independent control of light-emitting elements and high light extraction efficiency, limiting their versatility and energy efficiency in various applications.
Innovation Solution
A light-emitting device comprising a circuit board and a connection board with a light-emitting element, a light-converting layer, and isolation structures made of reflective or scattering materials, allowing for independent control of light-emitting elements and enhanced light extraction efficiency through thermal management and light directionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a connection board with lower thermal expansion coefficient is used, then thermal stability and reliability are improved, but manufacturing precision requirements increase
Solution Approach 1:
The connection board acts as an intermediary component between the circuit board and light-emitting elements. By selecting a material with thermal expansion coefficient between those of the circuit board and light-emitting elements (0.5-3.0 ppm/°C), it mediates thermal stress and prevents delamination while maintaining reliable electrical and thermal connections
Solution Approach 2:
The patent changes the thermal expansion parameter by selecting specific materials for the connection board (ceramic substrates like Al2O3, AlN, or SiC) whose thermal expansion coefficients are carefully chosen to be between those of the circuit board and light-emitting elements, thereby resolving the thermal mismatch problem
2Illumination intensity
If isolation structures with reflective or scattering materials are added, then light extraction efficiency is improved, but device complexity increases
Solution Approach 1:
The isolation structures serve dual functions: they electrically isolate adjacent light-emitting elements and simultaneously reflect or scatter light to improve extraction efficiency. By combining these functions into a single structural element, the patent avoids adding separate components and maintains manufacturing simplicity
Solution Approach 2:
The isolation structures are designed to perform multiple functions simultaneously: electrical isolation, light reflection, and light scattering. This multi-functionality reduces the need for additional components and simplifies the overall device structure while achieving high light extraction efficiency
3Adaptability or versatility
If light-converting layer is diced into segments, then independent control of light-emitting elements is enabled, but manufacturing complexity increases
Solution Approach 1:
The light-converting layer is diced into segments that correspond to individual light-emitting elements. This segmentation enables independent optical control of each element while maintaining a simple manufacturing process where the dicing is performed as a single step after bonding the light-converting layer to the connection board
4Object-generated harmful factors
If second isolation structure with light-absorbing material is added, then cross-talk between elements is reduced, but manufacturing steps increase
Solution Approach 1:
The second isolation structure with light-absorbing material is selectively placed only in regions where cross-talk needs to be suppressed, rather than covering the entire device. This targeted approach extracts only the necessary light-blocking function from the overall structure, reducing unnecessary manufacturing steps while effectively eliminating cross-talk
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 energy-efficient and versatile light-emitting devices with improved light extraction and independent control of elements, suitable for applications like adaptive driving beams, while maintaining low manufacturing complexity and cost.
Implementation Method 1
The first isolation structure includes a reflective or scattering material
Implementation Method 2
The first isolation structure includes a reflective or scattering material
Implementation Method 3
The second isolation structure includes a light-absorbing material
Implementation Method 4
a light-converting layer disposed on the first light-emitting element and the second light-emitting element
Data Source
AI summary
A light-emitting device is provided. The light-emitting device includes a circuit board and a connection board disposed on the circuit board and having a first pad, a second pad, and a third pad. The light-emitting device also includes a first light-emitting element disposed on the connection board and having a first electrode and a second electrode and a second light-emitting element adjacent to the first light-emitting element and having a third electrode and a fourth electrode. The light-emitting device further includes a light-converting layer disposed on the first light-emitting element and the second light-emitting element. The thermal expansion coefficient of the connection board is smaller than the thermal expansion coefficient of the circuit board.