LED Reflection Layer Layout for Leakage-Resistant Lamp Reliability
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Solution Overview
Problem
Lamps using semiconductor light emitting devices face reliability issues due to leakage current between electrode lines and reflection layers, leading to potential lighting failures and metal peeling, especially in high-temperature and high-humidity environments.
Innovation Solution
The design includes a wiring board with semiconductor light emitting devices connected in series and parallel configurations, a reflection layer with a power connection part, and partial reflection layers to ensure uniform voltage application, minimizing voltage deviations and electrochemical reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflection layer is provided under the wiring board to improve light extraction efficiency, then lighting performance is improved, but leakage current between electrode lines and reflection layer causes metal peeling and reliability degradation
Solution Approach 1:
An insulating layer is introduced between the electrode lines and the reflection layer to prevent direct contact and eliminate leakage current. This intermediary layer blocks the harmful electrical interaction while allowing the reflection layer to maintain its light-extracting function, thus resolving the contradiction between lighting performance and reliability
Solution Approach 2:
The harmful effect of leakage current is extracted and eliminated by separating the electrode lines from the reflection layer through insulation. The reflection layer's beneficial light-reflecting function is preserved while removing the detrimental electrical conduction path
2Ease of operation
If electrode lines are disposed on the wiring board to provide electrical connection, then electrical functionality is achieved, but voltage deviation between electrode lines causes non-uniform voltage application to reflection layer
Solution Approach 1:
The insulating layer ensures uniform voltage distribution across the reflection layer by preventing voltage-dependent leakage currents. It maintains equipotential conditions between different regions of the reflection layer, eliminating the voltage deviation caused by proximity to different electrode lines
3Productivity
If semiconductor light emitting devices are connected in series between wiring electrodes, then lighting function is achieved, but leakage current increases in high-temperature and high-humidity environments
Solution Approach 1:
The insulating layer acts as a mediator that blocks the generation and flow of leakage current in high-temperature and high-humidity environments. It prevents the harmful electrical interaction between electrode lines and reflection layer while maintaining the series connection functionality of the semiconductor light emitting devices
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 effectively prevents metal peeling and improves the reliability of the lamp by ensuring consistent voltage application to the reflection layer, reducing electrochemical reactions and maintaining light uniformity.
Implementation Method 1
A light emitting diode (LED) itself, not a package, is a semiconductor light emitting device that converts current into light
Implementation Method 2
a reflection layer made of a metal material provided on a surface opposite to the light emitting direction of the semiconductor light emitting device
Data Source
AI summary
A light emitting apparatus includes a plurality of wiring electrodes, a plurality of semiconductor light emitting devices connected between two of the plurality of wiring electrodes, and a reflection layer of metal disposed under the plurality of semiconductor light emitting devices, wherein the plurality of wiring electrodes are connected in series with each other by the plurality of semiconductor light emitting devices, and at least one of the plurality of semiconductor light emitting devices is connected between two consecutive wiring electrodes among the plurality of wiring electrodes.