Micro LED Mass Transfer Cavities for Precise Magnetic Placement
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Solution Overview
Problem
The challenge of assembling micro LEDs on a display substrate with high efficiency and low cost is significant due to their small size, which complicates the process of transferring and positioning these components accurately.
Innovation Solution
A mass transfer device with transfer cavities and a baffle mechanism that controls the fall of micro LEDs onto an array substrate, combined with a magnetic field to align and position them accurately, ensuring each LED is placed correctly into capture holes on the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional assembly methods are used for micro LEDs, then the assembly process is simple, but the assembly efficiency is low and positioning precision is poor due to the small size of micro LEDs
Solution Approach 1:
The invention divides the assembly process into two distinct stages: mass transfer stage (using gravity and magnetic fields for high-speed bulk transfer) and positioning stage (using precision magnetic fields for accurate placement). This segmentation allows each stage to be optimized independently, resolving the contradiction between speed and precision.
Solution Approach 2:
The invention introduces a magnetic field as an intermediary force to mediate the transfer and positioning of micro LEDs. The magnetic field acts as a controllable mediator that can simultaneously enable high-speed transfer and precise positioning, eliminating the need for direct mechanical contact and resolving the speed-precision trade-off.
2Productivity
If manual or traditional automated assembly is used, then device complexity is low, but assembly cost increases and efficiency decreases
Solution Approach 1:
The magnetic field generation system serves multiple functions: it enables mass transfer of micro LEDs, provides positioning control, and ensures proper orientation. This multi-functionality reduces the need for separate mechanisms for each operation, thereby limiting the increase in device complexity while achieving high assembly efficiency.
Solution Approach 2:
The invention replaces traditional mechanical assembly mechanisms (such as robotic grippers, precision positioning stages, and mechanical transfer systems) with a magnetic field-based system. This substitution eliminates complex mechanical linkages and actuators, reducing overall system complexity while improving assembly efficiency.
3Manufacturing precision
If precision positioning mechanisms are added to improve LED placement accuracy, then positioning precision improves, but device complexity and cost increase
Solution Approach 1:
The invention replaces complex mechanical positioning systems with a magnetic field-based positioning mechanism. The magnetic field provides non-contact, high-precision control of micro LED position and orientation without requiring mechanical stages, actuators, or complex feedback systems, thereby achieving high placement accuracy with reduced system complexity.
Solution Approach 2:
The invention controls the strength, distribution, and temporal characteristics of the magnetic field to achieve precise positioning. By dynamically adjusting magnetic field parameters (strength, gradient, direction) rather than using mechanical adjustments, the system achieves high placement accuracy with simpler overall system architecture.
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 and cost-effective assembly of micro LEDs on a display panel by ensuring precise alignment and transfer of LEDs of different colors, facilitating high-resolution image display.
Implementation Method 1
combined with a magnetic field to align and position them accurately
Implementation Method 2
controls the fall of micro LEDs onto an array substrate
Data Source
AI summary
A mass transfer device includes at least one transfer cavity. Each transfer cavity is configured to accommodate a plurality of micro light-emitting diodes. Each transfer cavity includes a bottom plate and a cavity wall connecting the bottom plate. The bottom plate defines a plurality of through holes spaced apart from each other. The transfer cavity is used to transfer the plurality of micro light-emitting diodes to the array substrate of a display panel through the plurality of through holes.