Magnetic Transfer Module for LED Chip Placement
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Solution Overview
Problem
The challenge in monolithic micro-LED displays is achieving efficient and uniform colorization, as different colored light emitting layers have varying lattice constants, making growth on a shared substrate difficult, and wavelength conversion materials have low conversion efficiency and uniform coating issues, while the picking-up and placement of LED chips affect brightness and display quality.
Innovation Solution
A magnetic transfer module with an electromagnet and transfer units containing ferromagnetic material elements and heating elements, allowing for selective demagnetization and precise transfer of electronic elements, enhancing flexibility and efficiency in transferring LED chips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If picking-up and placement technique is used for LED chips, then brightness and display quality are enhanced, but transfer efficiency and speed are reduced
Solution Approach 1:
The transfer module divides the transfer process into multiple independent transfer units, each capable of independently picking up and placing LED chips. This segmentation allows parallel operation of multiple transfer units, significantly improving transfer efficiency while maintaining precise placement capability for high brightness and display quality
Solution Approach 2:
The patent replaces traditional mechanical picking-up and placement systems with a magnetic field-based transfer system. The electromagnet generates magnetic fields to attract and transfer LED chips without physical contact, eliminating mechanical constraints and enabling faster, more efficient transfer while maintaining precise positioning for high-quality display
2Productivity
If traditional transfer methods are used, then device complexity is low, but transfer speed and efficiency are insufficient
Solution Approach 1:
The transfer module integrates multiple functions into a single system: the electromagnet serves both as the magnetic field generator for attracting LED chips and as part of the transfer mechanism. The heating element provides both demagnetization function and temperature control. This multi-functionality reduces the need for separate components, managing system complexity while achieving high transfer speeds
Solution Approach 2:
The system dynamically changes magnetic field parameters (strength, distribution) and temperature parameters to control the transfer process. By adjusting these parameters, the system achieves rapid transfer speeds while maintaining precise control, avoiding the need for complex mechanical systems with multiple moving parts
3Adaptability or versatility
If selective transfer is implemented, then flexibility of electronic element transferring is improved, but control complexity increases
Solution Approach 1:
The transfer module employs dynamic control of magnetic fields through independently controllable electromagnets and heating elements. Each transfer unit can be dynamically activated or deactivated based on transfer requirements, providing flexibility in selecting which LED chips to transfer while using centralized control logic to manage the complexity of coordinating multiple units
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 magnetic transfer module enables rapid and efficient transfer of electronic elements, improving the flexibility and quality of LED chip placement, thereby enhancing the brightness and display quality of monolithic micro-displays.
Implementation Method 1
The electromagnet magnetizes the ferromagnetic material element such that the ferromagnetic material element magnetically attracts one of the electronic elements
Implementation Method 2
The heating element is disposed between the electromagnet and the ferromagnetic material element, and heats the ferromagnetic material element to demagnetize the ferromagnetic material element while being actuated
Data Source
AI summary
A magnetic transfer module adapted to transfer a plurality of electronic elements. The magnetic transfer module includes an electromagnet and a plurality of transfer unit. The transfer units are connected to the electromagnet, each of the transfer units includes a ferromagnetic material element, and at least one of the transfer units includes a heating element. The electromagnet magnetizes the ferromagnetic material element, such that the ferromagnetic material element magnetically attracts one of the electronic elements. The heating element is disposed between the electromagnet and the ferromagnetic material element, and heats the ferromagnetic material element to demagnetize the ferromagnetic material element while being actuated.