MicroLED Self-Assembly Chuck for Warpage-Free Substrate Positioning
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Solution Overview
Problem
Current methods for manufacturing large-area displays using microLEDs face challenges such as high costs, low transfer efficiency, and warpage phenomena due to gravity, especially when self-assembling semiconductor light-emitting diodes on substrates, which affects the uniformity and yield of the assembly process.
Innovation Solution
A device and method for self-assembling semiconductor light-emitting diodes using a magnetic field and electric field to position and assemble microLEDs on a substrate, which includes a substrate chuck for correcting warpage and ensuring uniform dispersion, allowing for high-yield assembly of microLEDs on a small wafer for transfer to a large-area substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microLEDs are self-assembled on a substrate using conventional methods, then assembly can proceed, but warpage phenomenon occurs due to gravity affecting substrate flatness
Solution Approach 1:
The patent applies buoyant force from a fluid medium to counteract the gravitational force acting on the substrate, thereby compensating for warpage and maintaining substrate flatness during the self-assembly process. The fluid provides an upward buoyant force that balances the downward gravitational force, preventing gravity-induced deformation.
Solution Approach 2:
The patent utilizes a fluid medium (hydraulic principle) to provide buoyant force and support the substrate, replacing conventional mechanical support systems. The fluid environment allows the substrate to float at a controlled depth, maintaining flatness through hydrostatic buoyancy while enabling microLED self-assembly.
2Area of stationary object
If microLEDs are transferred to large-area substrates, then display area increases, but transfer efficiency decreases and costs increase
Solution Approach 1:
The patent employs self-assembly mechanisms where microLEDs automatically position themselves on the substrate through magnetic field guidance and electrostatic attraction, eliminating the need for complex manual or mechanical transfer processes. This self-service approach significantly improves transfer efficiency while enabling large-area substrate assembly.
Solution Approach 2:
The patent replaces conventional mechanical transfer systems with field-based mechanisms (magnetic and electrostatic fields) to guide and position microLEDs. This substitution eliminates mechanical contact and complex handling operations, improving transfer efficiency and reducing costs for large-area displays.
3Measurement precision
If magnetic field strength is increased to improve microLED positioning, then positioning precision improves, but energy consumption increases
Solution Approach 1:
The patent combines magnetic field and electrostatic field mechanisms to achieve microLED positioning. By merging these two field types, the system can utilize lower magnetic field strengths supplemented by electrostatic attraction, thereby maintaining positioning precision while reducing overall energy consumption compared to using magnetic fields alone.
Solution Approach 2:
The patent dynamically adjusts the strength and configuration of magnetic and electrostatic fields during the self-assembly process. By optimizing field parameters at different stages (e.g., stronger fields during initial attraction, weaker fields during fine positioning), the system achieves high positioning precision while minimizing energy consumption throughout the process.
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 efficient, cost-effective, and high-yield assembly of microLEDs on large-area substrates by using magnetic and electric fields to position microLEDs uniformly, reducing the impact of gravity and preventing non-specific binding, thus improving the manufacturing process for large-area displays.
Implementation Method 1
a magnetic field forming part having a plurality of magnets for applying magnetic force to the semiconductor light-emitting diodes dispersed in the fluid
Implementation Method 2
an electrode connection part for applying power to the assembly electrode to generate an electric field so that the semiconductor light-emitting diodes are placed at predetermined positions of the substrate
Implementation Method 3
the vertical moving part provided at the substrate chuck lowers the substrate to the fluid so that buoyancy by the fluid is applied to the substrate
Data Source
AI summary
Discussed is a device for self-assembling semiconductor light-emitting diodes, the device including an assembly chamber having a space for accommodating a fluid; and a substrate chuck having a substrate support part configured to support a substrate, and a vertical moving part for lowering the substrate so that one surface of the substrate is in contact with the fluid in a state in which the substrate is supported by the substrate support part.