Micro LED DBR Layer Layout for Vertical Light Loss Control
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Solution Overview
Problem
Micro LEDs experience light loss due to the vertical arrangement of light emitting mesas, which degrades light emission efficiency.
Innovation Solution
Incorporating a dielectric distributed Bragg reflection (DBR) layer between adjacent light emitting mesas to reflect light emitted by mesas above and allow light from mesas below to pass through, optimizing the refractive indices and thicknesses of the DBR layers to enhance reflection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple light emitting mesas are arranged in vertical direction, then the micro LED can be controlled with multiple electrodes, but light loss occurs and light emission efficiency degrades
Solution Approach 1:
A dielectric distributed Bragg reflection (DBR) layer is introduced as an intermediary between adjacent light emitting mesas. This DBR layer reflects light emitted by mesas above it and allows light from mesas below it to pass through, preventing light loss and improving light emission efficiency while maintaining the vertical arrangement for multi-electrode control
2Loss of energy
If DBR layer is added between adjacent light emitting mesas, then light emission efficiency is improved, but device complexity increases
Solution Approach 1:
The DBR layer parameters (refractive index, thickness) are optimized to achieve high reflection efficiency for specific wavelengths. By carefully selecting and tuning these parameters, the structure achieves improved light emission efficiency without requiring excessively complex designs
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
Improves light emission efficiency by reducing light loss and allowing for uniform mesa size, achieving higher reflection efficiency and balanced micro LED structure.
Implementation Method 1
at least one distributed Bragg reflection (DBR) layer formed between adjacent light emitting mesas, and configured to reflect light emitted by a light emitting mesa of the adjacent light emitting mesas disposed above the DBR layer and pass light emitted by one or more light emitting mesas disposed below the DBR layer
Data Source
AI summary
A micro LED includes two or more light emitting mesas which are disposed in a vertical direction from top to bottom; and at least one distributed Bragg reflection (DBR) layer formed between adjacent light emitting mesas, and configured to reflect light emitted by a light emitting mesa of the adjacent light emitting mesas disposed above the DBR layer and pass light emitted by one or more light emitting mesas disposed below the DBR layer.