Light-emitting Module Asymmetric Electrode Segmentation
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Solution Overview
Problem
High-density LED light-emitting modules for applications like floodlighting require a higher voltage supply due to the increased number of LED devices connected in series, leading to complex electrode structures and potential power supply capacity issues, while maintaining rotational symmetry and high brightness is desirable.
Innovation Solution
A light-emitting module design featuring a substrate with a first and second electrode, each comprising outer and inner arcuate electrodes, connected by straight-line electrodes, with LED devices arranged in concentric circles and strings connected to inner and outer electrodes, ensuring rotational symmetry and reduced series connections, thus simplifying the electrode structure and allowing for high-brightness operation with lower voltage requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large number of LED devices are mounted close together to achieve high brightness, then the luminous output increases, but the voltage required to drive the series-connected LED devices exceeds the capacity of available DC power supplies
Solution Approach 1:
The patent divides the electrode structure into multiple segments (first outer electrode, first inner electrode, second outer electrode, second inner electrode) arranged in concentric circles. This segmentation allows LED devices to be connected in parallel strings between corresponding inner and outer electrodes, reducing the number of series connections per string and thereby lowering the voltage requirement while maintaining high total brightness through increased LED density.
2Power
If one electrode is constructed from multiple electrodes to reduce the number of LED devices in series, then the voltage requirement decreases, but the electrode structure and bonding wire routing become complex
Solution Approach 1:
The patent employs asymmetric electrode configuration where the first electrode comprises a first outer electrode and a first inner electrode, and the second electrode comprises a second outer electrode and a second inner electrode. The inner electrodes are positioned closer to the center than the outer electrodes, creating an asymmetric radial layout that simplifies wire routing compared to symmetric multi-layer structures while achieving reduced series connections.
Solution Approach 2:
The patent transitions from a planar electrode arrangement to a multi-dimensional concentric circular arrangement with inner and outer electrodes at different radial positions. This dimensional change allows multiple LED strings to be connected in parallel between corresponding inner and outer electrodes, reducing series connections without requiring complex multi-layer wiring structures.
3Device complexity
If LED devices are arranged in a single string to simplify the electrode structure, then the electrode design becomes simpler, but the number of LED devices that can be mounted at high density is limited
Solution Approach 1:
The patent segments the electrode system into multiple concentric circular paths with inner and outer electrodes, creating multiple independent conduction paths. This allows LED devices to be arranged in multiple parallel strings radiating from the center, enabling high-density packing while maintaining relatively simple radial electrode structures that are easier to manufacture than multi-layer configurations.
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 module achieves high brightness with a simple electrode structure and rotational symmetry, allowing for efficient light distribution and reduced voltage requirements, enabling a higher packing density of LED devices while maintaining effective heat dissipation and reliability.
Implementation Method 1
a phosphor-containing resin for sealing the plurality of LED devices by being filled into a region surrounded by the dam member on the substrate
Data Source
AI summary
Provided is a light-emitting module that achieves high brightness, whose electrode structure is simple and whose brightness distribution has rotational symmetry. The light-emitting module includes a substrate, a first electrode and a second electrode disposed on the substrate, LED devices connected between the first electrode and the second electrode, a dam member disposed on the substrate so as to surround the LED devices, and a phosphor-containing resin for sealing the LED devices by being filled into a region surrounded by the dam member on the substrate. The first electrode includes a first outer electrode disposed under the dam member and a first inner electrode disposed nearer to a center of the substrate than the first outer electrode is. The second electrode includes a second outer electrode disposed under the dam member and a second inner electrode disposed nearer to the center of the substrate than the second outer electrode is. The first outer electrode is disposed so as to oppose the second inner electrode. The second outer electrode is disposed so as to oppose the first inner electrode.