Micro LED Supply Line Layout for Uniform Sub-Pixel Voltage
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Solution Overview
Problem
Micro LED display devices face significant voltage drop (IR drop) issues due to high current characteristics, leading to non-uniform voltage distribution among sub-pixels and limiting high-definition and large-area implementation.
Innovation Solution
A micro LED display device with a new structure where the supply voltage electrode is disposed directly below the micro LED area, minimizing the distance and reducing voltage drop by ensuring uniform voltage distribution across sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the supply voltage line is disposed in the conventional position (not directly below the micro LED area), then the manufacturing process is simpler, but the voltage drop (IR drop) increases and area utilization decreases
Solution Approach 1:
The supply voltage line is repositioned from a lateral arrangement to a vertical arrangement directly below the micro LED area, changing the spatial dimension of voltage delivery. This dimensional change reduces the current path length and resistance, thereby minimizing voltage drop while maintaining manufacturing feasibility through standard deposition processes
2Area of stationary object
If the supply voltage line is disposed directly below the micro LED area, then the voltage drop is reduced and area utilization is increased, but the manufacturing process complexity increases
Solution Approach 1:
The supply voltage line structure is merged with the underlying substrate or lower-layer structures, allowing the voltage line to serve dual purposes: as an electrical conductor and as part of the structural support. This merging reduces the need for additional separate components while achieving direct-below positioning, thus improving area utilization without proportionally increasing manufacturing complexity
3Loss of energy
If the supply voltage line is disposed directly below the micro LED area, then the voltage drop is reduced, but the device structure becomes more complex
Solution Approach 1:
The supply voltage line configuration is optimized locally directly below the micro LED area where the voltage drop is most critical. The line width, material composition, or cross-sectional area is enhanced in this specific region to minimize resistance, while other regions maintain standard designs. This localized optimization reduces voltage drop without requiring complex changes throughout the entire device structure
Data Source
AI summary
According to the present specification, provided is a micro LED display device comprising: a substrate, a supply voltage line on the substrate; and a micro LED area disposed on the supply voltage line. At least one portion of the supply voltage line is disposed at the vertical lower part of the micro LED area.