Flip-Chip LED Electrode Curved Extensions for Pin Damage Prevention
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Solution Overview
Problem
Current flip-chip LED designs face issues with electrode damage during the die-bonding process due to their proximity to the ejector pin contact area, leading to potential uneven current flow and light emission.
Innovation Solution
The design incorporates a second contact electrode with specific curved and straight extensions that maintain a safe distance from the ejector pin contact area, ensuring uniform current distribution and preventing damage while allowing for efficient light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electrodes are located near the ejector pin contact area, then the die-bonding process can be facilitated, but the electrodes may be accidentally damaged during the process
Solution Approach 1:
The second contact electrode is segmented into multiple parts: a main body portion, a first curved extension, a second curved extension, a connecting portion, a first straight extension, and a second straight extension. This segmentation allows the electrode to navigate around the ejector pin contact area while maintaining electrical connectivity and structural integrity.
Solution Approach 2:
The second contact electrode incorporates curved extensions instead of straight lines, allowing it to bend around the ejector pin contact area. The curved geometry enables the electrode to maintain a safe distance from the contact area while still achieving proper electrical connection and current distribution.
2Reliability
If the electrodes are placed on the periphery away from the center, then accidental damage from ejector pin contact is avoided, but current flow becomes uneven causing uneven light emission
Solution Approach 1:
Different portions of the second contact electrode have different geometries optimized for different functions: the main body portion provides structural support and protection, the curved extensions navigate around obstacles, the connecting portion ensures electrical continuity, and the straight extensions facilitate current distribution. This local optimization of geometry ensures both protection and uniform current flow.
Solution Approach 2:
The second contact electrode extends in multiple directions (curved extensions in radial directions, straight extensions in tangential directions) rather than following a simple linear path. This multi-dimensional configuration allows the electrode to maintain safe distances from the ejector pin contact area while still achieving comprehensive current distribution across the active region.
3Illumination intensity
If the second contact electrode extends toward the first contact electrode, then current distribution is improved, but the risk of interference with the ejector pin contact area increases
Solution Approach 1:
The curved extensions act as intermediaries that allow the second contact electrode to extend toward the first contact electrode for improved current distribution while simultaneously maintaining a safe distance from the ejector pin contact area. The curved geometry mediates between the conflicting requirements of current distribution and interference avoidance.
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 enhances the reliability and uniformity of light emission by preventing electrode damage and ensuring homogeneous current flow, thereby improving the overall performance of the flip-chip LED device.
Implementation Method 1
A conventional Light Emitting Diode (LED) is a semiconductor device that uses energy released during carrier recombination to generate light
Data Source
AI summary
A flip-chip LED device includes an epitaxial structure, a first contact electrode, and a second contact electrode. The second contact electrode is disposed on the epitaxial structure and extending toward the first contact electrode. The second contact electrode includes a first curved extension, a second curved extension, a connecting portion, a first straight extension, and a second straight extension. The connecting portion is connected to the first curved extension and to the second curved extension. The first straight extension is connected to the first curved extension. The second straight extension is connected to the second curved extension.