Series-Connected Vertical LEDs for High Power and Thermal Management
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Solution Overview
Problem
Conventional LED lighting devices face challenges in achieving high power and luminous efficiency while maintaining a long lifetime, often requiring high currents that lead to reduced lifespan and cooling issues.
Innovation Solution
The LED lighting device connects multiple vertical LEDs in series using top transparent electrodes, allowing for high power and luminous efficiency with lower current requirements, and employs a substrate with high thermal conductivity to manage heat effectively, eliminating the need for wire bonding and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high current is used to achieve high power and luminous efficiency, then power and efficiency are improved, but lifetime is reduced and cooling becomes problematic
Solution Approach 1:
The patent divides the LED lighting device into multiple vertical LEDs connected in series between the first bottom electrode and the second bottom electrode. This segmentation allows the total power to be distributed across multiple devices, reducing the current requirement for each individual LED while maintaining high overall power output, thus improving lifetime and reducing cooling demands
2Reliability
If multiple LEDs are connected in series, then current requirement is reduced and lifetime is extended, but device complexity increases
Solution Approach 1:
The first bottom electrode and second bottom electrode serve multiple functions: they act as electrical contacts for series connection, provide reflective surfaces to enhance light extraction efficiency, and function as thermal management interfaces. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving series connection for extended lifetime
3Ease of manufacture
If conventional wiring methods are used, then electrical connection is achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent merges the electrical connection function with the electrode structure itself. The top transparent electrodes and bottom electrodes directly establish electrical connections between multiple vertical LEDs through series configuration, eliminating the need for separate wire bonding or additional interconnection components. This integration simplifies the manufacturing process and reduces device complexity
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
This configuration enhances the LED lighting device's power and efficiency, extends the lifespan of the LEDs, and simplifies the manufacturing process by reducing heat generation and the complexity of current flow.
Implementation Method 1
The first bottom electrode is disposed on the substrate, in which the first bottom electrode is reflective
Implementation Method 2
employs a substrate with high thermal conductivity to manage heat effectively
Data Source
AI summary
A light-emitting diode (LED) lighting device includes a substrate, a first bottom electrode, a bottom transparent isolation layer, a first vertical LED, a second vertical LED, a first top transparent electrode, and a second top transparent electrode. The first bottom electrode is disposed on the substrate and is reflective. The first vertical LED and the second vertical LED are disposed on the first bottom electrode. The bottom transparent isolation layer covers the substrate and the first bottom electrode and exposes the first vertical LED and the second vertical LED. The first top transparent electrode is electrically connected to the first vertical LED. The second top transparent electrode is electrically connected to the second vertical LED. The first top transparent electrode, the second top transparent electrode, and the first bottom electrode cooperate to electrically connect the first vertical LED and the second vertical LED in series.