MicroLED Self-Assembly Using Magnetic and Electric Field Transfer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for manufacturing large-screen displays using semiconductor light-emitting diodes face challenges in transfer accuracy and efficiency, particularly with self-assembly technologies, which require high precision and are costly and time-consuming, especially when dealing with large numbers of microLEDs.
Innovation Solution
A method and device utilizing a combination of magnetic and electric fields to self-assemble semiconductor light-emitting diodes, allowing for precise positioning and assembly on a temporary substrate, enabling efficient transfer and reducing non-specific binding, with magnets used for assembly and re-use of remaining diodes in a fluid chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If self-assembly method is used to transfer microLEDs, then transfer efficiency is improved, but transfer accuracy deteriorates
Solution Approach 1:
A temporary substrate is introduced as an intermediary between the microLED array and the final display substrate. The microLEDs are first self-assembled onto the temporary substrate with high efficiency, then precisely transferred to the final substrate. This mediator enables both high-throughput self-assembly and precise positioning.
Solution Approach 2:
The transfer process is divided into two separate stages: first, high-efficiency self-assembly onto a temporary substrate; second, precise transfer to the final display substrate. This segmentation allows each stage to optimize for its specific requirement (speed vs. precision).
2Manufacturing precision
If conventional pick & place method is used, then transfer accuracy is maintained, but productivity deteriorates
Solution Approach 1:
The microLEDs perform self-assembly onto the temporary substrate through self-propulsion in fluid, eliminating the need for complex mechanical pick & place equipment. This self-service mechanism achieves high throughput while maintaining positioning accuracy through controlled fluid dynamics.
Solution Approach 2:
The mechanical pick & place system is replaced with a fluid-based self-propulsion system. MicroLEDs move autonomously in fluid under applied fields, substituting mechanical manipulation with field-driven motion for higher efficiency.
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 enables high-reliability, low-cost, and quick transfer of large numbers of semiconductor light-emitting diodes onto a large-area substrate, improving transfer accuracy and yield while minimizing the effects of gravity and friction, thus facilitating the manufacture of large-area display devices with high picture quality.
Implementation Method 1
whereby the semiconductor light-emitting diodes are moved in one direction by a magnetic field
Implementation Method 2
allows the semiconductor light-emitting diodes to be mounted at an assembly site by an electric field
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present invention relates to a device and method for self-assembling semiconductor light-emitting diodes. Particularly, a method for manufacturing a display device according to the present invention includes: feeding a substrate to an assembly site and putting semiconductor light-emitting diodes having a magnetic material into a fluid chamber; applying a magnetic force to the semiconductor light-emitting diodes so that the semiconductor light-emitting diodes move in one direction within the fluid chamber; and guiding the semiconductor light-emitting diodes to preset positions on the substrate by applying an electric field, so that the semiconductor light-emitting diodes are mounted at the preset positions while in the process of being moved.