Micro-LED Structure With Shared Emission Layer Offset Edges
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Solution Overview
Problem
Current micro-LED structures face inefficiencies due to surface recombination carrier loss when the light emitting layer aligns with the edges of the conductive layers, leading to reduced light emission efficiency.
Innovation Solution
A micro-LED structure design where the light emitting layer extends horizontally away from the edges of the conductive layers, preventing contact and minimizing surface recombination, combined with spacers and isolation structures to enhance performance and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the light emitting layer aligns with the edges of the conductive layers, then the manufacturing process is simpler, but surface recombination carrier loss increases and light emission efficiency decreases
Solution Approach 1:
The patent introduces asymmetric spacing between the light emitting layer and the conductive layers. Specifically, the light emitting layer is positioned such that its edges do not align with the edges of the first and second conductive layers, creating a non-symmetric structure that prevents surface recombination while maintaining manufacturing feasibility through controlled offset distances
Solution Approach 2:
The patent introduces an intermediate spacing structure between the light emitting layer and the conductive layers. This intermediate space acts as a mediator that prevents direct contact between the light emitting layer edges and the conductive layer edges, thereby reducing surface recombination carrier loss while allowing the structure to be manufactured with standard processes
2Loss of energy
If the light emitting layer extends away from the conductive layer edges, then light emission efficiency improves, but the device complexity increases
Solution Approach 1:
The patent applies local quality by creating different spatial relationships between the light emitting layer and the conductive layers at different locations. The light emitting layer is positioned with specific offset distances from the conductive layer edges in certain regions, while maintaining proper alignment in other regions, thereby locally optimizing light emission efficiency without requiring complex overall device redesign
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
This design improves light emission efficiency by reducing surface recombination and enhancing carrier injection efficiency, resulting in improved performance and reliability of the micro-LEDs.
Implementation Method 1
A micro-light emitting diode (micro-LED) is a device that emits light using an electric signal
Data Source
AI summary
A micro-LED chip includes multiple micro-LEDs. At least one micro-LED of the multiple micro-LEDs includes: a first type conductive layer; a second type conductive layer stacked on the first type conductive layer; and a light emitting layer formed between the first type conductive layer and the second type conductive layer. The light emitting layer is continuously formed on the whole micro-LED chip, the multiple micro-LEDs sharing the light emitting layer. The micro-LED chip further includes: a top spacer formed on a top surface of the light emitting layer; a bottom spacer formed on a bottom surface of the light emitting layer; and an isolation structure formed between adjacent micro-LEDs.