Vertical LED Series Connection for High Power and Low Current
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional LED light bulbs face challenges in achieving high power and luminous efficiency while maintaining a long lifetime, often requiring high current that can lead to reduced lifespan and cooling issues.
Innovation Solution
The LED lighting device consists of a substrate with recessed first and second vertical LEDs connected in series through reflective bottom and transparent top electrodes, allowing for high power and luminous efficiency with reduced current requirements, thereby extending the LEDs' lifespan and minimizing cooling problems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high current is used to achieve high power and luminous efficiency, then power and luminous efficiency are improved, but LED lifetime is reduced and cooling problems occur
Solution Approach 1:
The patent divides the LED lighting device into multiple vertical LEDs (first vertical LED and second vertical LED) connected in series. This segmentation allows the total power to be distributed across multiple components, reducing the current burden on each individual LED while maintaining high overall power output and luminous efficiency without compromising LED lifetime
Solution Approach 2:
The patent transitions from conventional horizontal LED arrangement to vertical LED structure. The vertical LEDs are disposed vertically on the substrate with electrodes extending in the vertical direction, enabling series connection and high voltage operation. This dimensional change allows achieving high power through voltage multiplication rather than current increase, thereby improving LED reliability
2Power
If high current is used to achieve high power and luminous efficiency, then power and luminous efficiency are improved, but cooling requirements increase
Solution Approach 1:
By segmenting the lighting device into multiple vertical LEDs connected in series, the patent reduces the current through each LED component. This segmentation distributes heat generation across multiple lower-current components, reducing the cooling burden on each individual LED and overall system cooling requirements while maintaining high power output
Solution Approach 2:
The vertical structure enables series connection of multiple LEDs, allowing high power operation at lower current through voltage stacking. This dimensional transition from horizontal to vertical arrangement fundamentally changes the thermal profile, reducing heat generation per component and simplifying cooling requirements
3Reliability
If conventional wire bonding is used for electrode connection, then electrical connection is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the electrode structure with the LED vertical configuration. The bottom electrode and top electrode are directly integrated with the vertical LED structure, eliminating the need for separate wire bonding processes. This merging of functions simplifies manufacturing while maintaining reliable electrical connections for series-connected vertical LEDs
Solution Approach 2:
The patent transitions from planar electrode connections to vertical electrode structures that extend upward from the substrate. This dimensional change allows direct electrical connection to the vertical LEDs without requiring wire bonding, simplifying the manufacturing process while ensuring reliable electrical connectivity
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 enables high power and luminous efficiency with lower current usage, enhancing the LEDs' lifespan and reducing heat generation, while also simplifying the manufacturing process by eliminating the need for wire bonding.
Implementation Method 1
The first bottom electrode is reflective and covers at least a part of the bottom surface and at least a part of the tapered side surface
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 substrate has a first recess therein. The first bottom electrode is disposed in the first recess and is reflective. The first vertical LED and the second vertical LED are disposed in the first recess and on the first bottom electrode. The first bottom transparent isolation layer is disposed in the first recess. 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.