Multi-Unit LED Electrode Layout for Light Extraction
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Solution Overview
Problem
Existing light-emitting devices face challenges in efficiently connecting multiple light-emitting units while maintaining effective electrical contact and light extraction.
Innovation Solution
A light-emitting device design featuring a substrate with first and second light-emitting units, each comprising semiconductor layers and a connecting electrode system that includes a trench exposing the substrate, insulating layers, and connecting electrodes to facilitate electrical connection between units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple light-emitting units are connected using conventional methods, then electrical connection is achieved, but light extraction efficiency deteriorates due to interference and non-uniform current distribution
Solution Approach 1:
The patent divides the light-emitting device into multiple independent light-emitting units separated by trenches. Each unit has its own semiconductor layers and electrode structures, allowing independent light extraction paths that do not interfere with each other, thereby maintaining high light extraction efficiency while enabling multiple units to be connected
Solution Approach 2:
The patent introduces insulating layers as intermediary structures between adjacent light-emitting units. These insulating layers fill the trenches and provide electrical isolation while allowing optical signals to pass through, enabling both electrical connection control and light extraction without interference between units
2Reliability
If connecting electrodes are added to connect multiple light-emitting units, then electrical connectivity is improved, but device complexity increases due to additional structures
Solution Approach 1:
The connecting electrode structure serves multiple functions simultaneously: it provides electrical connection between adjacent light-emitting units, acts as a barrier to prevent current leakage, and maintains structural integrity of the device. This multi-functionality reduces the need for separate components and simplifies the overall device architecture
Solution Approach 2:
The patent embeds the connecting electrode within the trench structure, nesting it between the insulating layer and the semiconductor layers. This nested arrangement allows the connecting electrode to be integrated into the existing device architecture without requiring additional space or complex external connections
3Illumination intensity
If trenches are formed to separate light-emitting units, then light extraction is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the trench depth parameter to expose only the necessary portion of the substrate while maintaining adequate separation between light-emitting units. By carefully controlling the trench depth within a specific range, the patent achieves effective light extraction and electrical isolation without requiring extremely high manufacturing precision
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 design enhances electrical connectivity and light extraction efficiency by allowing for uniform current injection and improved light emission characteristics across multiple light-emitting units.
Implementation Method 1
a connecting electrode comprising a first connecting part formed on the first light-emitting unit and connected to the first semiconductor layer formed in the first opening, a second connecting part formed on the second light-emitting unit and connected to the second semiconductor layer of the second light-emitting unit, and a third connecting part formed in the trench to connect the first connecting part and the second connecting part
Implementation Method 2
an insulating layer comprising a first opening on the first surrounding part and a second opening on the second semiconductor layer of the second light-emitting unit
Data Source
AI summary
A light-emitting device comprises a substrate; a first light-emitting unit and a second light-emitting unit formed on the substrate, each of the first light-emitting unit and the second light-emitting unit comprises a first semiconductor layer, a second semiconductor layer, and an active layer between the first semiconductor layer and the second semiconductor layer, wherein the first light-emitting unit comprises a first semiconductor mesa and a first surrounding part surrounding the first semiconductor mesa, and the second light-emitting unit comprises a second semiconductor mesa and a second surrounding part surrounding the second semiconductor mesa; a trench formed between the first light-emitting unit and the second light-emitting unit and exposing the substrate; a first insulating layer comprising a first opening on the first surrounding part and a second opening on the second semiconductor layer of the second light-emitting unit; and a connecting electrode comprising a first connecting part on the first light-emitting unit and connected to the first semiconductor layer formed in the first opening, a second connecting part on the second light-emitting unit and connected to the second semiconductor layer of the second light-emitting unit, and a third connecting part formed in the trench to connect the first connecting part and the second connecting part.