Micro-LED Assembly Transfer with In-Line Inspection Feedback
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Solution Overview
Problem
Existing technologies face a technical contradiction between transfer speed and yield when transferring millions of semiconductor light emitting devices to large-scale micro-LED displays, often resulting in increased error rates and reduced efficiency.
Innovation Solution
An intelligent integrated assembly and transfer apparatus that includes a fluid chamber, roller unit, and assembly inspection unit, allowing for simultaneous assembly and inspection of semiconductor light emitting devices on an assembly substrate, which is then transferred to a panel substrate only when fully assembled, utilizing a magnet head unit for magnetic force application and a panel chuck for precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transfer speed is improved by using self-assembly method for large-scale micro-LED display, then productivity increases, but transfer error rate increases resulting in lower yield
Solution Approach 1:
The patent implements an inspection unit that detects assembly status and provides feedback to the control unit. The control unit adjusts transfer operations based on this feedback, enabling real-time quality control during high-speed self-assembly transfer, thus maintaining high yield while achieving fast transfer speeds.
Solution Approach 2:
The patent performs inspection of assembly status before final transfer completion. By detecting potential errors early in the transfer process and preventing defective items from being fully transferred, the system maintains high transfer yield while preserving the efficiency of the self-assembly method.
2Reliability
If transfer yield is improved by lowering transfer defect rate, then reliability increases, but transfer speed is lowered
Solution Approach 1:
The inspection unit continuously monitors assembly status and provides real-time feedback to the control unit. This enables the system to maintain high transfer yield through accurate defect detection while preserving high transfer speed by only interrupting the transfer process when actual defects are detected, rather than using conservative slow transfer methods.
Solution Approach 2:
The system uses automated inspection and control units that independently monitor and adjust the transfer process without manual intervention. This automation maintains high transfer yield through consistent quality control while preserving high transfer speed by eliminating manual inspection bottlenecks.
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 solution significantly improves both transfer speed and yield by ensuring only fully assembled devices are transferred, potentially achieving almost 100% yield while maintaining high-speed transfer, and allows for flexible assembly and transfer processes without size limitations.
Implementation Method 1
a magnet head unit configured to apply a magnetic force to the semiconductor light emitting device to be assembled on the assembly substrate
Data Source
Figure 1
Figure 2a~2b
Figure 2c
AI summary
The embodiment relates to an intelligent integrated assembly and transfer apparatus. The intelligent integrated assembly and transfer apparatus according to the embodiment can include a fluid chamber 300, a roller unit 200 and assembly inspection unit 500. The fluid chamber 300 can accommodate semiconductor light emitting devices 150. Semiconductor light emitting devices 150 can be assembled on an assembly substrate 210. The assembly substrate 210 can be mounted on the roller unit 200. The roller unit 200 can rotate the assembly substrate 210. The assembly inspection unit 500 can inspect the semiconductor light emitting devices 150 assembled on the assembly substrate 210. The roller unit 200 can include a roller rotated part 220 where the assembly substrate 210 is mounted and rotated, a roller driving part 230 for rotating the roller rotated part 220, and a magnet head unit 400 for applying magnetic force to the semiconductor light emitting devices 150 to be assembled on the assembly substrate 210.