Light Emitting Device Leadframe Polarity Identification
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Solution Overview
Problem
Conventional light emitting devices face limitations in maximizing brightness due to electrode marks on the packaging material, which reduce the optic area and can be difficult to identify, leading to potential defects during encapsulation and reduced precision in polarity detection.
Innovation Solution
The solution involves providing electrode indicators on the external leads of light emitting devices and packages, eliminating marks on the package itself, and using distinct shapes or configurations on the leads to differentiate between positive and negative electrodes, thereby increasing the optic area and allowing for easier identification without compromising brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrode marks are provided on the packaging material to identify polarity, then polarity identification is enabled, but the optic area is reduced and brightness is limited
Solution Approach 1:
The patent extracts the electrode mark function from the packaging material and relocates it to the metal leads themselves. The leads are formed with asymmetric configurations (such as different lengths, shapes, or positions) that directly indicate polarity, eliminating the need for separate marks on the package and thereby maximizing the optic area.
Solution Approach 2:
The metal leads serve dual functions: they provide electrical connection and simultaneously serve as polarity indicators through their asymmetric configuration. This multi-functionality eliminates the need for separate indicator marks on the packaging material.
2Area of stationary object
If small electrode marks are made on the package corner to minimize impact, then optic area is partially preserved, but the marks become difficult to identify and require higher magnification
Solution Approach 1:
The patent employs asymmetric configurations of the metal leads themselves (such as different lead lengths, shapes, or positions) to indicate polarity. This asymmetric design provides clear, easily distinguishable polarity identification without requiring small marks on the package, thus maintaining full optic area while improving detectability.
3Measurement precision
If electrode marks are provided on packaging material, then polarity differentiation is achieved, but device complexity increases and manufacturing precision requirements increase
Solution Approach 1:
The polarity indication function is extracted from the packaging material and integrated into the metal leads themselves. This simplifies the overall package structure by eliminating separate indicator components and reduces manufacturing complexity by using the existing lead formation process.
Data Source
AI summary
Light emitting devices, packages and related methods are disclosed with electrical leads with one or more indicators. A package can include a leadframe that can include at least a first lead and a second lead. The first lead can include a first end for electrical connection to at least one light emitting device and a second end extending toward a first side of the package. The second lead can include a first end for electrical connection to at least one light emitting device and a second end extending toward a second side of the package. One or both of the second end of the first lead or the second end of the second lead can comprise an indicator serving as an identifier.