Light Emitting Device Package With Segmented Cavities
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Solution Overview
Problem
Existing light emitting device packages lack effective individual protection and variability detection, which can lead to reliability issues and interference during electrical testing.
Innovation Solution
A light emitting device package design featuring multiple light emitting devices disposed in parallel cavities with protective devices, allowing for independent detection and protection of each device, and reinforced structures for enhanced reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple light emitting devices are disposed in parallel cavities with individual protective devices, then reliability and individual variability detection are improved, but device complexity increases
Solution Approach 1:
The patent divides the light emitting device package into multiple independent cavities (first cavity, second cavity, etc.), each containing a separate light emitting device and protective device. This segmentation allows individual testing and protection of each device, improving reliability through isolated fault detection while maintaining manageable complexity through modular design.
Solution Approach 2:
The patent introduces lead frames as intermediary structures that provide both mechanical support for the light emitting devices and electrical connection pathways. The lead frames enable individual electrical testing of each device through dedicated test electrodes, facilitating variability detection without requiring complex external testing infrastructure.
2Reliability
If protective devices are added to individually protect light emitting devices, then reliability improves, but manufacturing complexity increases
Solution Approach 1:
The patent combines multiple functions into the lead frame structure: mechanical support, electrical connection, and test electrode provision. By merging these functions into a single integrated component, the patent simplifies the manufacturing process while still providing individual protective devices for each light emitting device, thereby improving reliability without proportionally increasing manufacturing complexity.
3Measurement precision
If light emitting devices are disposed in separate cavities for individual detection, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent segments the package into distinct cavities with dedicated test electrodes for each light emitting device. This segmentation enables precise individual measurement of electrical characteristics (forward voltage, light output) without interference from adjacent devices, improving measurement precision while keeping the overall structure organized and manageable.
Solution Approach 2:
The lead frame serves multiple functions: structural support, electrical connection, and measurement facilitation. By making the lead frame multi-functional, the patent achieves precise individual device detection without adding separate complex measurement infrastructure, thereby improving measurement precision while controlling device complexity.
Data Source
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AI summary
Disclosed are a light emitting device package and a light unit including the same. The light emitting device package includes a body; a first lead frame having a first cavity in a first region of the body; a second lead frame having a second cavity in a second region of the body; a first bonding part protruding into a region between a first lateral side of the body and the first cavity from the first lead frame; a second bonding part protruding into a region between a second lateral side of the body, which is opposite to the first lateral side of the body, and the second cavity from the second lead frame; a first light emitting device in the first cavity; a second light emitting device in the second cavity; a third lead frame separated from the first and second lead frames and disposed between the first lateral side of the body and the first cavity; a fourth lead frame separated from the first and second lead frames and disposed between the second lateral side of the body and the second cavity; a first protective device on one of the third lead frame and the first bonding part; and a second protective device on one of the fourth lead frame and the second bonding part.