Integrated Zener Diode LED Structure for ESD Protection
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Solution Overview
Problem
Semiconductor light emitting devices face challenges in withstanding reverse electrostatic discharge (ESD) and maintaining brightness due to the need for separate Zener diodes, which increase costs and reduce light emission efficiency.
Innovation Solution
A semiconductor light emitting device is designed with a monolithic structure integrating a Zener diode within the light emitting diode, where the Zener diode is formed in a region conventionally used for electrodes, sharing a common electrode with the light emitting diode, thereby enhancing ESD protection and reducing light loss areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate Zener diodes are mounted with light emitting diodes in packages, then ESD protection is improved, but light emission area is reduced
Solution Approach 1:
The patent merges the Zener diode and light emitting diode into a single integrated structure on the same substrate. The Zener diode region and light emitting diode region share common electrodes and are formed in different regions of the same semiconductor device, eliminating the need for separate discrete Zener diode mounting and thereby preserving light emission area while providing ESD protection.
Solution Approach 2:
The patent implements multi-functionality by designing the semiconductor device to simultaneously perform light emission and ESD protection functions. The integrated structure includes both a light emitting diode region for light generation and a Zener diode region for electrostatic discharge protection, allowing a single device to fulfill multiple protective and functional roles.
2Reliability
If separate Zener diodes are mounted with light emitting diodes, then ESD protection is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple functions into a single integrated semiconductor device structure. Both the Zener diode and light emitting diode are formed on the same substrate with shared electrodes, reducing the number of discrete components and simplifying the overall device architecture while maintaining ESD protection functionality.
Solution Approach 2:
The integrated semiconductor device provides multi-functionality by incorporating both light emission and ESD protection capabilities in a single device. This universal approach eliminates the need for separate discrete Zener diode mounting, thereby reducing device complexity and assembly steps while providing comprehensive protection and functional performance.
3Reliability
If Zener diodes are mounted separately, then ESD protection is provided, but light emission efficiency is reduced
Solution Approach 1:
The patent merges the Zener diode and light emitting diode into an integrated structure where both functions coexist on the same substrate. This integration eliminates the need for separate Zener diode mounting that would otherwise block or reduce the light emission area, thereby maintaining high light emission efficiency while providing ESD protection through the integrated Zener diode region.
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 integrated Zener diode structure improves the device's withstand voltage against reverse ESD and maintains or enhances brightness by reducing current crowding and space loss for light emission.
Implementation Method 1
Light emitting diodes (LEDs) emit light through the recombination of electrons and holes within a P-N junction between semiconductor materials included therein, using electric current flowing therethrough
Implementation Method 2
In order to protect light emitting devices from electrostatic discharge (ESD) during operations of the light emitting devices using light emitting diodes, Zener diodes are often used
Data Source
AI summary
A semiconductor light emitting device includes a substrate; a light emitting structure and a Zener diode structure disposed to be spaced apart from each other on the substrate, and including a first semiconductor layer and a second semiconductor layer, respectively; and a common, integrally formed, electrode electrically connected to the first semiconductor layer of the light emitting structure and the second semiconductor layer of the Zener diode structure. At least a portion of the Zener diode formed by the Zener diode structure is disposed below the common electrode.