LED Device Laminate Conductive Layer Current Crowding
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Solution Overview
Problem
Large LED chips experience poor current spreading due to current crowding, which reduces their efficiency and lighting performance.
Innovation Solution
The LED device incorporates a laminate structure with a first conductive layer comprising a first and second conductive sub-layer at different depths, along with a current blocking layer, and extended electrodes in electrical contact with these sub-layers, allowing for improved current distribution and reduced crowding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If large LED chips are used to increase power output, then the power capability is improved, but the current spreading effect deteriorates due to current crowding
Solution Approach 1:
The first conductive layer is divided into two separate conductive sub-layers (first conductive sub-layer and second conductive sub-layer) positioned at different depths. This segmentation allows current to be distributed through multiple pathways, preventing current crowding while maintaining high power output capability in large LED chips.
Solution Approach 2:
The patent introduces a vertical dimension to current distribution by positioning conductive sub-layers at different depths within the first conductive layer. This multi-level structure enables current to spread both horizontally and vertically, effectively solving the current crowding problem in large area LEDs.
2Reliability
If multi-electrode extension structure is adopted to improve current spreading, then the current distribution is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple functions into the first conductive layer by creating a laminate structure with two conductive sub-layers and a current blocking layer integrated together. This merged structure achieves improved current spreading without requiring separate complex multi-electrode extensions, thus reducing overall device complexity.
Solution Approach 2:
The first conductive layer is constructed as a composite laminate structure comprising multiple conductive sub-layers and a current blocking layer. This composite approach provides enhanced current distribution capabilities while maintaining structural integration, avoiding the need for additional separate components.
3Area of stationary object
If extended electrodes are arranged in interlaced arrangement to spread current, then the current coverage area is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The conductive sub-layers are pre-formed within the first conductive layer during the epitaxial growth process, establishing the current distribution pathways before electrode fabrication. This preliminary action simplifies subsequent electrode alignment and reduces manufacturing precision requirements for extended electrode arrangement.
Data Source
AI summary
A light-emitting diode (LED) device and a method of producing the same are provided. The LED device comprises a first conductive layer, a second conductive layer, an active layer sandwiched between the first conductive layer and the second conductive layer and a first electrode in electrical contact with the first conductive layer. The first conductive layer has a laminate structure comprising a first conductive sub-layer, a current blocking layer, and a second conductive sub-layer. The first electrode comprises a first extended electrode in electrical contact with the first conductive sub-layer, and a second extended electrode in electrical contact with the second conductive sub-layer. The first conductive sub-layer and the second conductive sub-layer may have different depths.