Micro LED Transfer Alignment Using Pre-formed Marks
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Solution Overview
Problem
Current LED display technologies face challenges in accurately transferring display units onto a substrate during fabrication, requiring significant time and resources.
Innovation Solution
The implementation of a display device with a substrate, transistors, display units, and alignment marks on both the display and non-display areas, allowing for precise alignment and efficient transfer of micro LED units using a pick apparatus with alignment marks for improved accuracy and reduced processing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional LED display fabrication methods are used, then the manufacturing process can be completed, but the accuracy of transferring display units onto the substrate is insufficient and the processing time is excessive
Solution Approach 1:
Alignment marks are formed on the substrate before the transfer process begins. These pre-formed marks serve as reference points that guide the pick apparatus during the transfer operation, enabling precise positioning of display units without requiring time-consuming alignment procedures during the actual transfer.
Solution Approach 2:
Alignment marks act as an intermediary element between the pick apparatus and the substrate. The marks provide a common reference framework that facilitates accurate alignment and positioning, mediating the transfer process between the picking mechanism and the target substrate locations.
2Productivity
If traditional alignment methods are used during transfer, then the process can be completed, but the accuracy and efficiency are compromised due to lack of precise reference points
Solution Approach 1:
Alignment marks are prepared in advance on the substrate during earlier fabrication steps. This preliminary preparation eliminates the need for complex real-time alignment procedures, allowing the pick apparatus to quickly and accurately position display units by referencing the pre-established mark locations.
Solution Approach 2:
The alignment marks create a reference pattern that is copied or replicated across the substrate. This consistent pattern provides multiple reference points that guide the pick apparatus in accurately reproducing the desired display unit arrangement without requiring continuous measurement and adjustment.
Data Source
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AI summary
A display device is provided. The display device includes a substrate, a plurality of transistors, a plurality of display units, and a plurality of alignment marks. The substrate includes a display area and a non-display area adjacent to the display area. The plurality of transistors is disposed on the display area of the substrate. The plurality of display units is disposed on the display area of the substrate, and the plurality of display units is electrically connected to the plurality of transistors. The plurality of alignment marks is disposed on the substrate, wherein at least one of the plurality of alignment marks is disposed on the display area of the substrate.