Magnet Control Unit for LED Chip Self-Assembly Direction Control
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Solution Overview
Problem
The self-assembly of semiconductor light emitting devices for display pixels faces challenges in controlling the direction of semiconductor light emitting device chips, leading to reduced assembly rates, increased residual chips, and assembly defects due to inadequate magnetic field control, which hampers the efficiency and speed of the process.
Innovation Solution
A magnet unit with a magnet body and a magnet control unit around its circumference, including spacers and focusing units made of materials like ferrite, nickel, and cobalt, is used to control the magnetic flux direction, allowing for improved positioning and assembly of semiconductor light emitting devices by rotating the magnet support unit, thereby enhancing assembly efficiency and reducing residual chips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple magnet body is used for self-assembly, then the device complexity is reduced, but the assembly rate and positioning precision deteriorate due to inadequate magnetic field control
Solution Approach 1:
The magnet body is segmented into multiple independent magnetic units, each capable of being independently controlled. This segmentation allows precise control over magnetic field distribution, enabling high-speed assembly while maintaining manageable device complexity through modular architecture
Solution Approach 2:
The magnetic units are made dynamically controllable through rotation and positioning mechanisms. By dynamically adjusting the orientation and position of individual magnetic units, the system achieves precise control over semiconductor chip assembly rate and positioning, transforming a static simple magnet into an active controlled system
2Speed
If magnetic field strength is increased to improve assembly speed, then the movement speed of semiconductor light emitting device chips increases, but the direction control precision deteriorates
Solution Approach 1:
Different regions of the magnetic field are given different qualities through independent control of multiple magnetic units. High field strength regions accelerate chips, while controlled lower strength regions provide precision positioning, achieving both high speed and high precision through spatially varying magnetic field characteristics
Solution Approach 2:
The magnetic field parameters (strength, direction, distribution) are dynamically changed by rotating and repositioning magnetic units during the assembly process. This allows the system to optimize magnetic field characteristics for different stages of chip assembly, achieving both high movement speed and precise direction control
3Productivity
If semiconductor light emitting device chips are supplied rapidly to increase productivity, then the assembly rate improves, but the transfer error rate increases and yield decreases
Solution Approach 1:
The system incorporates feedback mechanisms that monitor chip positioning and magnetic field effectiveness in real-time. Based on this feedback, the control system dynamically adjusts magnetic unit positions and orientations, enabling rapid assembly while maintaining high transfer yield by correcting errors as they occur
Solution Approach 2:
The system replaces traditional mechanical pick-and-place mechanisms with a magnetic field-based self-assembly approach. Semiconductor chips with magnetic properties are manipulated entirely through controlled magnetic fields, eliminating mechanical contact errors and enabling high-speed, high-precision assembly through non-contact magnetic manipulation
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 controlled magnetic field direction improves the assembly rate by 2 to 3 times, reduces residual chips, and increases the movement speed of semiconductor light emitting device chips, resulting in higher assembly efficiency and eliminating the need for separate chip collection processes.
Implementation Method 1
a magnet unit capable of controlling a direction of a semiconductor light emitting device for a display pixel
Implementation Method 2
The self-assembly process using magnetism and dielectrophoresis (DEP)
Implementation Method 3
a first magnet focusing unit spaced apart from the outer circumference of the magnet body
Implementation Method 4
The self-assembly process using magnetism and dielectrophoresis (DEP)
Data Source
AI summary
The embodiment relates to a magnet unit of a semiconductor light emitting device for a display pixel and a self-assembly device using the same. A magnet unit according to an embodiment includes a magnet body and a magnet control unit disposed around an outer circumference of the magnet body. The magnet control unit includes a first magnet focusing unit spaced apart from an outer circumference of the magnet body and a first spacer disposed between the magnet body and the first magnet focusing unit.