Light Emitting Device With ESD Protection Part And Ga-Face Connection
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Solution Overview
Problem
Light emitting devices are vulnerable to static electricity, which can damage them and affect their reliability and operation voltage characteristics over time.
Innovation Solution
A light emitting device structure is developed with an electro-static discharge (ESD) protection part and a conductive support member, where the Ga-face region is electrically connected to the ESD protection part to ensure superior thermal stability and operation voltage characteristics, and a protection member is used to prevent electrical shorts and moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional light emitting device structure is used, then the device is simple in structure, but the device is vulnerable to static electricity damage
Solution Approach 1:
The light emitting device is divided into distinct functional regions: a light emitting part and an electro-static discharge protection part. This segmentation allows the ESD protection functionality to be added without requiring complete redesign of the entire device structure, thus improving reliability while controlling complexity.
Solution Approach 2:
A first connection layer is introduced as an intermediary element that electrically connects the light emitting part to the ESD protection part. This intermediary structure enables the ESD protection functionality to be integrated into the device without directly modifying the core light emitting structure, resolving the contradiction between added protection and structural simplicity.
2Reliability
If the N-face region is used for electrical connection, then the structure is simpler, but the operation voltage characteristics deteriorate over time
Solution Approach 1:
The patent specifies that the first connection layer should be connected to the Ga-face region rather than the N-face region. This local quality change in the electrical connection structure provides superior thermal stability and maintains operation voltage characteristics over time, addressing the reliability issue while requiring only a localized structural modification.
3Reliability
If protection layers are added to prevent moisture ingress, then reliability improves, but manufacturing complexity increases
Solution Approach 1:
The first protection layer is merged with the first connection layer structure, where the connection layer serves dual purposes: electrical connection and protection. This merging approach provides moisture ingress protection while minimizing the addition of separate manufacturing steps, thus improving reliability with limited impact on manufacturing ease.
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 protects the light emitting device from static electricity, enhancing its reliability and maintaining superior operation voltage characteristics over extended use, while preventing electrical shorts and moisture ingress.
Implementation Method 1
A light emitting device includes a light emitting part, an electro-static discharge (ESD) protection part, a first connection layer, and a first protection layer. The ESD protection part is configured to protect the light emitting device from static electricity
Implementation Method 2
A first connection layer electrically connects the light emitting part to the ESD protection part. An end of the first connection layer is connected to the Ga-face region of the first conductive type semiconductor layer
Implementation Method 3
A first protection layer is disposed on an inner surface of a light emitting structure layer to electrically separate the light emitting part from the ESD protection part
Data Source
Figure 1
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AI summary
Provided are a light emitting device and a light emitting device package. According to the light emitting device, a light emitting part (101) and an electro-static discharge (ESD) protection part (103) are disposed on a conductive support member (195). A connection layer (170) electrically connects a first conductive type semiconductor layer (110) of the light emitting part to a second conductive type semiconductor layer (132) of the ESD protection part. A protection member (197) is disposed on the connection layer and the ESD protection part.