Micro-LED Self-Assembly Using Rotating Magnets and Electric Fields
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Solution Overview
Problem
Current methods for manufacturing large-area displays using micro-LEDs face challenges such as low transfer precision, high frictional forces, and inefficient assembly processes, particularly in self-assembly techniques, which affect the yield and accuracy of semiconductor light emitting devices.
Innovation Solution
A self-assembly method and apparatus utilizing a fluid chamber, magnetic forces, and electric fields to precisely position micro-LEDs on a substrate, minimizing friction and ensuring accurate placement, even on curved surfaces, by rotating magnets to maintain a consistent magnetic force and using multiple magnets for efficient coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If self-assembly method is used to transfer micro-LEDs, then productivity is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent replaces traditional mechanical pick-and-place transfer methods with a self-assembly approach using magnetic fields. Micro-LEDs with magnetic bodies are manipulated through magnetic forces generated by magnets on the substrate, eliminating mechanical contact and enabling parallel assembly of multiple devices simultaneously, thus improving productivity while maintaining precision through field-based control.
Solution Approach 2:
The patent utilizes changes in magnetic field parameters (strength, direction, distribution) to control the self-assembly process. By adjusting magnetic field parameters, the system can guide micro-LEDs to specific positions with high precision while maintaining high-speed parallel assembly, resolving the contradiction between productivity and manufacturing precision.
2Manufacturing precision
If conventional transfer methods are used, then manufacturing precision is maintained, but productivity deteriorates
Solution Approach 1:
The patent segments the transfer process into independent magnetic field zones on the substrate, each capable of manipulating micro-LEDs simultaneously. This segmentation enables parallel processing of multiple devices without sacrificing individual placement precision, thereby achieving both high productivity and manufacturing precision.
3Productivity
If magnetic force is applied to move micro-LEDs, then productivity is improved, but manufacturing precision deteriorates due to friction
Solution Approach 1:
The patent introduces a fluid environment (water or oil) in which micro-LEDs are suspended during assembly. This fluid medium eliminates friction between micro-LEDs and the substrate, allowing magnetic forces to move devices smoothly and precisely to target positions, thereby maintaining both high productivity and positioning accuracy.
4Manufacturing precision
If flat substrate is used, then manufacturing precision is improved, but adaptability deteriorates
Solution Approach 1:
The patent employs dynamic magnetic field generation that can adapt to substrate geometry. Magnets are positioned and controlled to compensate for curvature variations, allowing the system to maintain precise alignment and positioning accuracy on both flat and curved substrates, thereby achieving both manufacturing precision and adaptability.
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-yield, cost-effective manufacturing of large-area displays with improved transfer accuracy and reduced risk of device damage, allowing for uniform magnetic force application even on bent substrates, thus enhancing the assembly process.
Implementation Method 1
a magnet disposed to be spaced apart from the fluid chamber so as to apply a magnetic force to the semiconductor light emitting devices
Implementation Method 2
a power supply unit that induces the formation of an electric field on the substrate such that the semiconductor light emitting devices are seated at preset positions on the substrate
Data Source
AI summary
Discussed is a self-assembly apparatus of a semiconductor light emitting device, the self-assembly apparatus including a fluid chamber configured to accommodate a plurality of semiconductor light emitting devices, each semiconductor light emitting device having a magnetic body; a magnet disposed to be spaced apart from the fluid chamber and configured to apply a magnetic force to the plurality of semiconductor light emitting devices; and a position controller connected to the magnet, and configured to control a position of the magnet; and a power supply configured to induce formation of an electric field on a substrate placed at an assembly position so that the plurality of semiconductor light emitting devices are seated at preset positions on the substrate while being moved due to a positional change of the magnet, wherein the position controller transfers the magnet in one direction while rotating the magnet about a rotation axis for the magnet.