Microprinting Transfer Using LED Release and Bonding Layers
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Solution Overview
Problem
Current methods for transferring microdevices from a donor substrate to a receiver substrate are inefficient, as they lack precise control over the release and bonding processes, leading to potential misalignment and damage to adjacent devices.
Innovation Solution
A high-resolution LED array is used to selectively release or cure microdevices by focusing light onto a release or bonding layer, allowing for precise control over the transfer process, with a housing structure to minimize light leakage and a holding layer for secure attachment to the receiver substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a high-resolution LED array is used to selectively release or cure microdevices, then manufacturing precision and placement accuracy are improved, but device complexity and cost increase
Solution Approach 1:
The system segments the transfer process into distinct functional layers: a release layer for selective detachment, a housing structure for mechanical support, and a holding layer for secure attachment to the receiver substrate. This segmentation allows each layer to be optimized independently while working together to achieve precise placement.
Solution Approach 2:
The release layer acts as an intermediary between the microdevice and the housing structure, enabling controlled release through light exposure. Similarly, the holding layer serves as an intermediary between the microdevice and the receiver substrate, providing secure attachment only when and where needed. These intermediary layers mediate the transfer process to achieve precise placement without requiring complex direct manipulation.
2Manufacturing precision
If light is focused selectively onto the release or bonding layer, then transfer precision is improved, but light leakage to neighbouring microdevices increases
Solution Approach 1:
The housing structure is designed with specific optical properties that vary by location: it is configured to confine and direct light precisely where needed while providing shielding in adjacent areas. This local differentiation of optical properties allows the system to achieve high transfer precision while preventing light leakage to neighboring microdevices through the structured housing design.
3Productivity
If the microdevices are transferred selectively, then productivity and efficiency are improved, but the risk of misalignment and damage to adjacent devices increases
Solution Approach 1:
The microdevices are pre-positioned and held in a fixed array on the donor substrate before transfer. The release layer is pre-configured with specific optical properties that enable selective release. This preliminary arrangement ensures that when transfer occurs, the devices are already in the correct positions and orientations, eliminating misalignment risks during the actual transfer process while maintaining high productivity through selective batch processing.
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 method enables precise and efficient transfer of microdevices with reduced light leakage and improved bonding, ensuring accurate placement and secure attachment to the receiver substrate, enhancing the reliability of microdevice integration.
Implementation Method 1
A high resolution display comprising a light emitting device (LED) array may be provided to assist in transferring the microdevices. The LED array can selectively either release a layer by using light or cure a bonding layer.
Implementation Method 2
The release layer may include a layer converting light to heat causing ablation and pushing the microdevices out of housing toward the receiver substrate.
Implementation Method 3
The housing can also absorb the Light from the LEDs to further reduces the light leakage to the adjacent/neighbouring microdevices.
Data Source
AI summary
Embodiments disclose methods of transferring selected microdevices on a receiver substrate. In one embodiment, a high resolution display comprising a light emitting device (LED) array may be provided to assist in transferring the microdevices. The LED array can selectively either release a layer by using light or cure a bonding layer. The pixels in the display can be turned on corresponding to a set of selected microdevices with predefined intensities to release the set of selected microdevices from the donor substrate.