Micro-Device Transfer Buffering for Coplanar Integration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Micro-devices, particularly micro-LEDs, are fragile and prone to damage during the transfer process due to their brittle nature, which hinders efficient integration into receiving substrates.
Innovation Solution
A transfer device with wells and a buffering member, such as a magnetic or electromagnet system, suspends and supports micro-devices, providing a buffering space to absorb uneven forces and prevent damage during transfer, allowing for precise alignment and bonding on a receiving substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If micro-devices are transferred using conventional methods, then transfer process can be completed, but micro-devices are easily damaged due to their fragile and brittle nature
Solution Approach 1:
The patent introduces a buffering member positioned between the transfer substrate and the micro-device to provide cushioning before damage can occur. This buffering member absorbs uneven forces during the transfer process, preventing direct transmission of harmful stresses to the fragile micro-device structures.
Solution Approach 2:
The buffering member acts as an intermediary element between the transfer substrate and the micro-device. It mediates the interaction forces during transfer, distributing and softening the mechanical stresses that would otherwise directly impact the brittle micro-device components.
2Ease of operation
If pressure is applied to transfer micro-devices, then transfer can be achieved, but uneven forces may damage the fragile micro-devices
Solution Approach 1:
The buffering member is pre-positioned to cushion against uneven forces before they can damage the micro-device. It provides a compliant interface that absorbs pressure variations and prevents concentrated stress points during the transfer operation.
Solution Approach 2:
The buffering member changes the mechanical parameters of the transfer interface by introducing compliance and force distribution. It transforms the pressure application from a rigid, potentially damaging force into a distributed, controlled stress field that protects the micro-device.
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
The solution effectively reduces micro-device damage and enhances transfer efficiency by maintaining platform stability and allowing for coplanar positioning, ensuring successful integration without physical harm.
Implementation Method 1
providing a buffering space to absorb uneven forces
Implementation Method 2
A transfer device with wells and a buffering member, such as a magnetic or electromagnet system, suspends and supports micro-devices
Data Source
AI summary
A device for transferring micro-devices from a holding device to a final surface, avoiding damage during the process and ensuring coplanar presentation onto the final surface, includes a first substrate on the holding device. The holding device carries at least one transfer substrate which itself carries a plurality of micro-devices. At least one buffering member is located between the first substrate and the transfer substrate. The buffering member provides a small range of buffering for the micro-devices during the transfer and also compensates for any slight unevenness when the micro-devices are laid on and bonded to the final surface. A method for transferring the micro-devices is also disclosed.