Micro LED Transfer Using Magnetic Attraction for Precision
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Solution Overview
Problem
The mass transfer of Micro LEDs from an original epitaxial substrate to a display substrate is challenging due to inaccurate positioning, leading to reduced yield and increased production time, with existing methods like electrostatic adsorption or van der Waals force resulting in short circuits and low batch transfer efficiency.
Innovation Solution
The use of magnetic layers on both the Micro LEDs and the display substrate, where a first magnetic layer on the LED generates a magnetic attraction force with a second magnetic layer on the substrate, ensuring precise positioning of the LED onto a sub-pixel during the transfer process, utilizing magnetic nano-particles or ferromagnetic metal materials for the magnetic layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If electrostatic adsorption or van der Waals force is used for transferring Micro LEDs, then the transfer process can be completed, but positioning accuracy is poor leading to short circuits and low yield
Solution Approach 1:
The patent replaces electrostatic adsorption and van der Waals force with magnetic attraction force for the transfer process. Magnetic layers with opposite polarities are configured on both the Micro LED and display substrate, creating a magnetic attraction force that enables precise positioning and reliable transfer, eliminating the positioning accuracy issues and short circuits associated with electrostatic and van der Waals methods
Solution Approach 2:
The patent changes the physical parameter of the transfer mechanism from electrostatic/van der Waals forces to magnetic attraction force. By configuring magnetic layers with specific opposite polarities, the system achieves both accurate positioning and reliable transfer, simultaneously improving manufacturing precision and yield
2Productivity
If existing transfer methods are used, then transfer can be completed, but batch transfer efficiency is low and production time is increased
Solution Approach 1:
The patent replaces inefficient electrostatic and van der Waals transfer methods with magnetic attraction force, enabling batch transfer of multiple Micro LEDs simultaneously with high precision. This substitution dramatically improves batch transfer efficiency and reduces production time while maintaining reliability
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 method improves positioning accuracy, increases batch transfer efficiency, reduces the risk of short circuits, and enhances yield, while simplifying the production process and reducing costs, making it suitable for large-scale production.
Implementation Method 1
the first magnetic layer is configured to generate a magnetic attraction force to a second magnetic layer of the display substrate during a transfer process, so that the light emitting diode is positioned to fall onto a sub-pixel of the display substrate under action of the magnetic attraction force
Data Source
AI summary
Provided are a light emitting diode, a display substrate and a transfer method. The transfer method includes: preparing a transfer substrate and the display substrate respectively, wherein the transfer substrate includes a plurality of light emitting diodes arranged in a matrix; aligning the transfer substrate with the display substrate, wherein first magnetic layers of the light emitting diodes on the transfer substrate correspond to second magnetic layers of the sub-pixels on the display substrate one by one; and driving the transfer substrate to approach the display substrate, so that the light emitting diodes on the transfer substrate are positioned to fall onto the sub-pixels of the display substrate by action of magnetic attraction forces generated by the first magnetic layers and the second magnetic layers.