Microdevice Transfer Template for Precise Defect-Aware Placement
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Solution Overview
Problem
Current methods for transferring micro-devices from a donor substrate to a system substrate are inefficient, leading to defects and non-uniformity in micro-device arrays, which affects the performance of devices such as LEDs and sensors.
Innovation Solution
A method involving the use of cartridges and templates with alignment marks, where micro-devices are arranged, bonded, and transferred using various mechanisms like electrostatic or thermal bonding, with defect identification and adjustment to optimize the transfer process, ensuring precise placement and minimization of defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional transfer methods are used, then the transfer process is simple, but the transfer efficiency is low and defects are high
Solution Approach 1:
The invention segments the transfer process into multiple controlled stages: (1) arranging microdevices in cartridges with precise positioning features, (2) bonding cartridges to templates with alignment marks, (3) aligning templates to receiver substrates, and (4) transferring microdevices. This segmentation allows each stage to be optimized independently, improving overall transfer efficiency while reducing defects through systematic control of each step.
Solution Approach 2:
The invention performs preliminary actions by pre-arranging microdevices in cartridges with integrated positioning features before the actual transfer. The cartridges are pre-bonded to templates that include alignment marks, and the system performs preliminary alignment and defect identification. This preliminary preparation ensures that when transfer occurs, it is efficient and accurate, reducing defects.
2Manufacturing precision
If alignment marks and templates are used, then placement precision is improved, but process complexity increases
Solution Approach 1:
The invention merges multiple functions into integrated components: cartridges contain both microdevices and positioning features, templates include both alignment marks and bonding structures, and the system combines alignment, bonding, and transfer operations. This merging reduces the number of separate components and steps needed, improving placement precision without proportionally increasing process complexity.
Solution Approach 2:
The cartridges serve multiple functions: they hold microdevices, provide positioning features for alignment, and act as transfer carriers. The templates provide both alignment references and bonding surfaces. This multi-functionality reduces the need for separate specialized components, achieving high placement precision while managing process complexity.
3Reliability
If defect identification and adjustment are performed, then transfer quality is improved, but transfer time increases
Solution Approach 1:
The system performs preliminary defect identification and adjustment during the cartridge preparation and bonding stages, before the actual microdevice transfer. By identifying and addressing defects early in the process rather than during or after transfer, the system improves transfer quality without adding significant time to the critical transfer path.
Solution Approach 2:
The defect identification and adjustment processes are integrated into the continuous transfer workflow rather than being separate interruptive steps. The system maintains continuous operation by performing quality checks and adjustments in-line during cartridge handling and bonding, ensuring transfer quality while minimizing interruptions to the overall transfer time.
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 enhances the efficiency and uniformity of micro-device transfer, reducing defects and improving the performance and consistency of micro-device arrays in system substrates like printed circuit boards and display backplanes.
Implementation Method 1
bonding the one or more cartridges with the template... transferring the plurality of microdevices from the template into the receiver substrate
Implementation Method 2
bonding the one or more cartridges with the template... transferring the plurality of microdevices
Data Source
AI summary
This invention relates to integrating pixelated micro-devices into a system substrate. Defined are methods of transferring a plurality of micro-devices into a receiver substrate where a plurality of micro-devices is arranged in one or more cartridges that are aligned and bonded to a template. Further, defining the transfer process, the micro-devices may be selected, identified as defective and a transfer adjustment made based on defective micro-devices.