Magnetic Transfer Apparatus for Microdevice Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge lies in accurately transferring a large number of miniaturized microdevices, such as micro LED dies, to a target substrate for high-density display technology, requiring precise bonding and integration while overcoming the complexity of handling millions of tiny components.
Innovation Solution
An apparatus and method utilizing a magnetic attracting surface with a magnetic material layer, comprising iron, cobalt, or nickel, and a magnetic shielding layer to align and bond microdevices onto a substrate using magnetic heads or holes, enabling precise alignment and thermal bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional mechanical transfer methods are used for microdevices, then the transfer process is simple in design, but the positioning precision and alignment accuracy deteriorate due to the miniaturized size of microdevices
Solution Approach 1:
The patent replaces conventional mechanical transfer methods with a magnetic field-based transfer system. Magnetic attracting heads generate magnetic fields that interact with magnetic material layers on microdevices, enabling precise positioning and alignment without direct mechanical contact. This substitution of mechanical systems with magnetic field systems resolves the contradiction by achieving high positioning precision while maintaining manageable apparatus complexity through non-contact control.
Solution Approach 2:
The patent introduces magnetic fields as an intermediary between the transfer apparatus and microdevices. The magnetic attracting heads and magnetic material layers create a magnetic field interaction zone that mediates the transfer process, enabling precise control of microdevice positioning and alignment. This intermediary approach allows for high manufacturing precision while avoiding the complexity of direct mechanical manipulation at the microscale.
2Manufacturing precision
If the number of microdevices to be transferred increases for high-density displays, then the display resolution improves, but the transfer time and processing complexity increase
Solution Approach 1:
The patent segments the transfer process into multiple magnetic attracting heads arranged in arrays, allowing simultaneous transfer and positioning of multiple microdevices. Each magnetic attracting head independently controls a microdevice, enabling parallel processing that reduces overall transfer time while maintaining high alignment accuracy through individualized magnetic field control for each device.
Solution Approach 2:
The patent implements preliminary alignment through magnetic field interaction before final bonding. The magnetic attracting heads pre-position microdevices with high alignment accuracy on the substrate, and only after precise alignment is achieved does the bonding process commence. This preliminary action ensures high alignment accuracy for large numbers of devices without requiring repeated adjustments, thereby reducing total transfer time.
3Manufacturing precision
If magnetic material layers are added to microdevices for magnetic transfer, then the transfer precision improves, but the manufacturing complexity and process steps increase
Solution Approach 1:
The patent merges the magnetic material layer integration with existing microdevice fabrication processes. The magnetic material layers are deposited during the standard semiconductor manufacturing sequence, combining the magnetic functionality with the device structure creation. This merging approach achieves high transfer precision while minimizing additional manufacturing complexity by integrating rather than adding separate process steps.
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
Enables efficient, precise transfer and bonding of microdevices onto a substrate, facilitating high-density displays by leveraging magnetic forces for alignment and thermal treatments for secure bonding, thus addressing the complexity of handling millions of tiny components.
Implementation Method 1
the magnetic attracting surface comprises at least one magnetic attracting layer
Implementation Method 2
applying a thermal treatment to make the at least one microdevice bond to the conductive bonding layer
Data Source
AI summary
This invention provides an apparatus for transferring at least one microdevice and a method for transferring at least one microdevice, which is characterized by utilizing the apparatus for transferring at least one microdevice having a magnetic attracting substrate with at least one magnetic attracting head or magnetic attracting position hole to attract at least one microdevice having at least one magnetic layer disposed on a temporary substrate, and transfer the at least one microdevice to the conductive bonding layer of the at least one microdevice bonding region on a target substrate thereafter.