Vertical Micro LED Mesa Structure for High-Resolution Efficiency
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Solution Overview
Problem
The light emission efficiency of micro LEDs degrades as their pitch and dimension become smaller, leading to suboptimal performance in micro LED display panels.
Innovation Solution
The implementation of a micro LED structure that includes a bonding layer at the bottom with two or more light emitting mesas disposed vertically and electrically connected in series, enhancing light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pitch and dimension of micro LED are reduced to increase resolution, then the resolution is improved, but the light emission efficiency degrades
Solution Approach 1:
The micro LED is segmented into multiple light emitting mesas arranged in a vertical direction, where each mesa can be independently controlled. This segmentation allows the total light emitting area to be maintained across multiple smaller emitting regions, thereby preserving light emission efficiency even when the overall micro LED dimension is reduced for higher resolution displays.
2Measurement precision
If the dimension of micro LED is reduced to increase display density, then the display resolution is improved, but the light emitting area decreases
Solution Approach 1:
The patent transitions from a planar arrangement of light emitting regions to a vertical three-dimensional arrangement. Multiple light emitting mesas are stacked in the vertical direction, allowing the light emitting area to be expanded along the vertical dimension while maintaining a small horizontal footprint, thus achieving high display resolution without sacrificing total light emitting area.
3Loss of energy
If multiple light emitting mesas are arranged vertically and electrically connected in series, then the light emission efficiency is improved, but the device complexity increases
Solution Approach 1:
Multiple light emitting mesas are electrically connected in series within a single micro LED structure, merging multiple emitting regions into one controllable unit. This series connection allows all mesas to be driven by a single control signal, maintaining ease of operation while achieving improved light emission efficiency through the combined light output of multiple mesas.
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 series.