ESD Suppression Pattern with Conductive Particles in Resin

Solution Overview

Problem

Light emitting diodes (LEDs) are susceptible to damage from electrostatic discharge (ESD), which can cause current to flow in a reverse direction, damaging the active layer and reducing light output, and existing solutions like mounting ESD prevention devices during packaging lower the light emitting output.

Innovation Solution

A light emitting device with an electrostatic discharge suppression pattern featuring conductive particles dispersed in a resin, which functions as an insulator below a threshold voltage and a conductor above it, covering the gap between electrodes to prevent ESD damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a Zener diode, varistor, or TVS device is mounted during packaging to prevent ESD damage, then the light emitting device is protected from electrostatic discharge, but the light emitting output is lowered due to light absorption by the ESD prevention device and additional manufacturing complexity

Engineering Contradiction:

ImproveESD protectionVSAvoidpackaging structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The ESD protection function is merged with the existing packaging structure by forming the ESD suppression pattern directly on the packaging substrate. This integrates the protection mechanism into the packaging layer itself, eliminating the need for separate ESD prevention devices and reducing structural complexity while maintaining ESD protection capability

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The ESD suppression pattern acts as an intermediary element between the light emitting device and the packaging substrate. It provides ESD protection through its conductive particles that create discharge paths, while being transparent to light emission, thus mediating between protection requirements and light output without blocking the light path

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If a Zener diode, varistor, or TVS device is mounted during packaging to prevent ESD damage, then the light emitting device is protected from electrostatic discharge, but the light emitting output is lowered due to light absorption

Engineering Contradiction:

ImproveESD protectionVSAvoidlight emitting output

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The ESD suppression pattern acts as an intermediary element between the light emitting device and the packaging substrate. It provides ESD protection through its conductive particles that create discharge paths, while being transparent to light emission, thus mediating between protection requirements and light output without blocking the light path

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The ESD suppression pattern exhibits local quality by having conductive properties only in specific regions where ESD protection is needed, while maintaining optical transparency in the light emission path. The conductive particles are strategically positioned to provide protection without interfering with light output

Inventive Principle:

Principle #3Local quality

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 solution effectively prevents ESD damage by forming a current path between electrodes when necessary, enhancing the reliability and maintaining light output while avoiding the absorption issues of traditional ESD prevention methods.

Implementation Method 1

when a voltage lower than the threshold voltage is supplied between the first electrode and the second electrode, the electrostatic discharge suppression pattern may insulate the first electrode from the second electrode

Methodology Applied

Scientific EffectElectrical insulation: Electrical Resistance

Implementation Method 2

when a voltage higher than or equal to the threshold voltage is supplied between the first electrode and the second electrode, the electrostatic discharge suppression pattern may electrically connect the first electrode to the second electrode

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 3

an electrostatic discharge suppression pattern configured to overlap the first electrode and the second electrode, having first particles conductive and dispersed in a resin, and configured to cover a gap between the first electrode and the second electrode

Methodology Applied

Scientific EffectElectrostatic discharge suppression: Electrostatic Discharge

Data Source

PatentUS10586892B2Light emitting device with an electrostatic discharge (ESD) suppression pattern having first and second conductive particles dispersed in a resin

Publication Date: 2020.03.10 SUZHOU LEKIN SEMICON CO LTD

AI summary

One embodiment relates to a light emitting device which is free from electrostatic discharge by using an electrostatic discharge suppressing pattern including a resin having particles conductive and dispersed therein, the light emitting device comprising: a light emitting structure including a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer; a first electrode connected with the first conductive semiconductor layer; a second electrode connected with the second conductive semiconductor layer; and an electrostatic discharge suppressing pattern, which is overlapped with the first electrode and the second electrode, and of which first particles are dispersed in the resin so as to cover a gap between the first electrode and the second electrode.