Micro-LED Current Control Layer Opening Pattern
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Solution Overview
Problem
Micro-light-emitting diodes (micro-LEDs) face challenges in achieving adequate brightness while maintaining efficiency and uniformity, as conventional methods often result in high emitting energy and large emitting areas, making it difficult to miniaturize and manufacture with acceptable yield rates.
Innovation Solution
The design incorporates a current controlling layer with openings that limits the current flow area, allowing for a smaller light emitting region and increased current density, enabling miniaturization and improved efficiency by controlling the current flow through specific areas within the micro-LED.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the emitting area of micro-LED is increased to provide adequate brightness, then the brightness level is improved, but the device size increases and miniaturization becomes difficult
Solution Approach 1:
The patent applies local quality by creating non-uniform current distribution through selectively positioned opening patterns in the current controlling layer. Different regions of the micro-LED have different current densities, with higher current concentration in specific areas defined by the opening patterns, enabling bright emission from a small overall device area.
2Area of moving object
If the emitting area of micro-LED is decreased for miniaturization, then the device size is reduced, but the brightness becomes insufficient
Solution Approach 1:
The patent employs composite material structures including multiple semiconductor layers (first type and second type), current controlling layers with specific opening patterns, and electrode configurations. This composite structure enables efficient current confinement and optical emission enhancement, achieving high brightness from miniaturized devices through optimized material composition and arrangement.
3Loss of energy
If the current density is increased to improve efficiency, then the energy conversion efficiency is improved, but the uniformity of current distribution deteriorates
Solution Approach 1:
The patent utilizes parameter changes by systematically varying the opening patterns (size, shape, distribution) in the current controlling layer to optimize the balance between current density concentration and uniformity. By adjusting these geometric parameters, the invention achieves high energy efficiency while maintaining acceptable current distribution uniformity across the emitting region.
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 approach allows for the continuation of micro-LED miniaturization while maintaining manufacturing feasibility, providing adequate brightness and uniform current density, thereby enhancing the operating stability and efficiency of micro-LEDs.
Implementation Method 1
when electrons and holes recombine across the semiconductor gap, the recombination energy is emitted in the form of photons and generates light
Implementation Method 2
The light-permeable part is transparent or semi-transparent
Data Source
AI summary
A micro-light-emitting diode (micro-LED) includes a first type semiconductor layer, a second type semiconductor, a first current controlling layer, a first electrode, and a second electrode. The second type semiconductor layer and the first current controlling layer are joined with the first type semiconductor layer. The first current controlling layer has at least one opening therein. The first electrode is electrically coupled with the first type semiconductor layer through the opening. The second electrode is electrically coupled with the second type semiconductor layer. At least one of the first electrode and the second electrode has a light-permeable part. A vertical projection of the first current controlling layer on said one of the first electrode and the second electrode overlaps with the light-permeable part. The light-permeable part is transparent or semi-transparent.