Micro-LED Pixel Electrode Structure for High-Resolution Light Extraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display apparatuses face challenges in achieving high-resolution and high-efficiency displays while requiring complex manufacturing processes.
Innovation Solution
A display apparatus is designed with a pixel array comprising LED cells with a width of 100 μm or less, featuring a stacked structure of conductivity-type semiconductor layers, a transparent electrode with inclined portions, and reflective electrodes, along with a passivation layer to enhance light extraction efficiency and simplify the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If LED cells are miniaturized to achieve high resolution, then display resolution is improved, but manufacturing complexity increases
Solution Approach 1:
The display apparatus is divided into modular components: pixel arrays with LED cells, separate driving circuits on a dedicated circuit board, and distinct bonding electrode structures. This segmentation allows each module to be manufactured and tested independently, reducing overall manufacturing complexity while maintaining high resolution through precise pixel arrangement
Solution Approach 2:
The patent transitions from planar electrode structures to three-dimensional configurations, including inclined transparent electrodes at 40°-70° angles and stacked semiconductor layers. This dimensional change improves light extraction efficiency and simplifies the bonding process by creating self-aligning structures that are more tolerant to manufacturing variations
2Ease of manufacture
If conventional electrode structures are used, then manufacturing is simpler, but light extraction efficiency is reduced
Solution Approach 1:
The transparent electrodes are designed with inclined surfaces at 40°-70° angles rather than flat surfaces. This curvature/inclination changes the light extraction path, reducing total internal reflection and improving light outcoupling efficiency while maintaining manufacturing feasibility through standard semiconductor fabrication techniques
Solution Approach 2:
The patent optimizes multiple parameters simultaneously: LED cell width (100 μm or less), inclined angle (40°-70°), and layer thicknesses. By carefully controlling these parameters, the design achieves high light extraction efficiency without requiring complex manufacturing processes, as the parameters are optimized within standard fabrication capabilities
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
The solution enables the production of high-efficiency, high-resolution displays with improved light extraction and a simplified manufacturing process, optimizing the electrode structure for miniaturization and performance.
Implementation Method 1
A transparent electrode is on a lower surface of each of the LED cells, and each transparent electrode includes a cone or pyramid-shaped inclined portion
Implementation Method 2
A first reflective electrode is on the side surface of each of the LED cells and is spaced apart from each of the LED cells by the passivation layer
Implementation Method 3
Each of the LED cells may have a width of 100 μm or less and includes a first conductivity-type semiconductor layer, an active layer, and a second conductivity-type semiconductor layer sequentially stacked
Data Source
AI summary
A display apparatus includes a circuit board including driving circuits; and a pixel array on the circuit board and including a plurality of pixels, wherein the pixel array includes LED cells having a pillar shape and including first and second conductivity-type semiconductor layers and an active layer, wherein a width thereof is 100 μm or less, and a height thereof is greater than the width; a transparent electrode on lower surfaces of the LED cells and including a cone or pyramid-shaped inclined portion; a passivation layer disposed on side surfaces of the LED cells and extending from a side surface of the LED cell to a side surface of the inclined portion of the transparent electrode.