LED Unit Trench Electrode Layout for Uniform Current Injection
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Solution Overview
Problem
Current light-emitting devices face challenges in efficiently connecting and distributing electrical current between light-emitting units, leading to uneven current density and potential issues with light extraction efficiency.
Innovation Solution
A light-emitting device design featuring a substrate with first and second light-emitting units separated by a trench, connected via a connecting electrode system that includes insulating layers and electrodes to ensure uniform current distribution and improved light extraction, utilizing a specific arrangement of openings and recesses to facilitate efficient electrical connection and light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If light-emitting units are closely arranged to increase device density, then productivity and area utilization are improved, but current distribution becomes uneven and light extraction efficiency deteriorates
Solution Approach 1:
An insulating layer is introduced as an intermediary between adjacent light-emitting units. This insulating layer with controlled opening areas acts as a mediator to regulate current flow paths, preventing direct electrical interference between closely spaced units while maintaining high device density. The opening areas in the insulating layer are specifically designed to control current distribution uniformity across the device.
Solution Approach 2:
The insulating layer is configured with spatially varying opening areas - different regions have different opening sizes to locally optimize current distribution. This local quality variation ensures that current density is uniformly distributed across different light-emitting units even when they are closely arranged, addressing the specific needs of each region to maintain reliability.
2Reliability
If connecting electrodes are added to connect light-emitting units, then current distribution is improved, but device complexity increases
Solution Approach 1:
The insulating layer serves multiple functions simultaneously: it provides electrical insulation between units, defines current flow paths through its opening areas, and acts as a structural framework for connecting electrodes. This multi-functionality reduces the need for separate dedicated components, thereby improving current distribution without proportionally increasing device complexity.
Solution Approach 2:
The connecting electrodes are merged with the insulating layer structure, where the electrodes are formed within or on the insulating layer rather than as separate complex structures. This merging simplifies the overall electrode system while maintaining effective current distribution across light-emitting units.
3Reliability
If opening areas in insulating layer are increased to improve current injection, then light extraction efficiency is improved, but electrical insulation performance deteriorates
Solution Approach 1:
The opening areas in the insulating layer are precisely controlled within specific parameter ranges. By optimizing the size, shape, and distribution of openings, the design achieves sufficient current injection efficiency while maintaining adequate electrical insulation. The parameter optimization balances the competing requirements of current flow and insulation.
Solution Approach 2:
The insulating layer may utilize composite material structures that provide both good electrical insulation properties and controlled current flow characteristics. The composite structure allows simultaneous achievement of insulation performance and current injection efficiency through material composition and structural design.
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 solution enhances current distribution and light extraction efficiency by ensuring uniform current injection and emission across the light-emitting units, addressing the challenges of uneven current density and improving overall device performance.
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
Implementation Method 3
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
Implementation Method 4
Light-Emitting Diode (LED) is a solid-state semiconductor light-emitting device
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.