LED Assembly Structure With Electrostatic Guide Hole for ESD Protection
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Solution Overview
Problem
Light emitting diodes (LEDs) are prone to instability and reduced lifespan due to abrupt voltage increases caused by electrostatic discharge (ESD), which can damage the chip.
Innovation Solution
Incorporating an electrostatic guide hole in the protective layer between electrodes and the LED chip, which exposes the first electrode to guide the ESD current away from the chip, thereby preventing damage and maintaining the cap shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective layer completely covers the first electrode, then the LED chip is protected from external damage, but electrostatic discharge current cannot be guided away from the chip
Solution Approach 1:
The patent extracts a portion of the protective layer to form an electrostatic guide hole, removing the harmful effect of complete coverage while maintaining protection elsewhere. This hole allows ESD current to be guided away from the LED chip through the first electrode, resolving the contradiction between complete protection and ESD guidance.
Solution Approach 2:
The electrostatic guide hole acts as an intermediary structure that mediates between the protective layer and the first electrode. It provides a controlled path for ESD current to flow through the first electrode to ground, preventing direct damage to the LED chip while maintaining the integrity of the protective layer.
2Reliability
If an electrostatic guide hole is created in the protective layer, then ESD current can be guided away from the LED chip, but the shape of the cap may be compromised
Solution Approach 1:
The patent applies local quality by creating a small, localized electrostatic guide hole at a specific position where the first electrode is exposed. This localized modification does not compromise the overall cap shape while providing the necessary ESD guidance function. The hole is strategically positioned to maintain aesthetic and structural integrity.
3Reliability
If a separate ESD elimination device is added, then ESD protection is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges the ESD protection function with the existing protective layer and first electrode structure. Instead of adding a separate ESD elimination device, the electrostatic guide hole integrates ESD guidance functionality into the existing cap structure, reducing device complexity while maintaining protection.
Solution Approach 2:
The first electrode serves multiple functions: it provides electrical connection for LED operation and acts as an ESD guidance path to ground. The electrostatic guide hole enables this multi-functionality, allowing the same structure to serve both lighting and protection purposes without additional components.
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 solution effectively prevents LED chip damage from ESD, eliminates the need for separate ESD elimination devices, reduces energy consumption, and maintains the cap shape, offering eco-friendly and cost-effective benefits.
Implementation Method 1
the electrostatic guide hole is disposed at a protective layer between first and second electrodes and a light emitting diode chip, to expose the first electrode, thereby enabling current of electrostatic discharge to be guided toward the electrostatic guide hole
Data Source
AI summary
A light emitting diode assembly is disclosed. The light emitting diode assembly includes a first electrode and a second electrode spaced apart from each other on a substrate, a light emitting diode overlapping with the first electrode and the second electrode, a cap covering the light emitting diode, and a protective layer covering the first electrode and the second electrode and including an electrostatic guide hole exposing a portion of the first electrode.