Parallel Mesa Micro LED Structure for High-Resolution Light Efficiency
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Solution Overview
Problem
The light emission efficiency of micro LEDs deteriorates as their pitch and dimension become smaller, leading to suboptimal performance in applications such as self-emissive micro-displays and visible light communications.
Innovation Solution
The implementation of a micro LED structure featuring a bonding layer at its bottom, with two or more light emitting mesas disposed vertically and electrically connected in parallel, enhances light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pitch and dimension of micro LED are reduced to achieve higher resolution, then the resolution is improved, but the light emission efficiency seriously degrades
Solution Approach 1:
The micro LED is divided into multiple light emitting mesas (first light emitting mesa and second light emitting mesa) that are electrically connected in parallel. Each mesa acts as an independent light emitting unit, allowing the total light output to be maintained even as the overall pitch and dimension are reduced for higher resolution displays.
2Quantity of substance
If the dimension of micro LED is reduced to achieve higher density, then the quantity of LEDs per area is improved, but the light extraction efficiency degrades
Solution Approach 1:
The patent utilizes the vertical dimension by stacking multiple light emitting mesas vertically, with the first light emitting mesa and second light emitting mesa arranged in different vertical levels. This three-dimensional configuration allows multiple light emitting surfaces to be packed within a smaller horizontal footprint, maintaining high light extraction efficiency while achieving higher LED density per area.
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 configuration improves light emission efficiency by allowing for better strain relaxation, improved light extraction, and uniform current spreading, thereby addressing the efficiency degradation issues in smaller micro LEDs.
Implementation Method 1
two or more light emitting mesas provided on the bonding layer and disposed in a vertical direction from top to bottom, wherein the two or more light emitting mesas are electrically connected in parallel
Data Source
AI summary
A micro LED includes a bonding layer provided at a bottom of the micro LED; and two or more light emitting mesas provided on the bonding layer and disposed in a vertical direction from top to bottom, wherein the two or more light emitting mesas are electrically connected in parallel.