Micro-LED Cluster Transfer for Precise Full-Color Display Assembly
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Solution Overview
Problem
Existing micro-LED display manufacturing methods face challenges in achieving high throughput, alignment accuracy, and cost-effectiveness due to complex fabrication processes and interference issues during the transfer of micro-LEDs of different colors, leading to defects and reduced display quality.
Innovation Solution
The method involves transferring micro-LED clusters, such as sub-raxels and raxels, in a single step to a display panel, eliminating physical interference by aligning and bonding them directly to electrical connectors without multiple overlapping steps, using integrated driving circuits and optical elements to enhance precision and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If micro-LEDs are transferred sequentially in multiple overlapping steps, then alignment can be achieved, but physical interference occurs between different color micro-LEDs causing defects and reduced throughput
Solution Approach 1:
The invention segments the micro-LEDs into distinct non-overlapping transfer zones on the substrate, where each zone contains micro-LEDs of a specific color. This segmentation allows all zones to be transferred simultaneously in a single step without physical interference, while maintaining precise alignment through the structured zone design.
Solution Approach 2:
The invention uses the substrate plane as an additional dimension to organize different color micro-LEDs into separate spatial zones before transfer. By arranging red, green, and blue micro-LEDs in distinct non-overlapping areas on the substrate, the system enables simultaneous transfer without interference, effectively using spatial dimensionality to resolve the contradiction between alignment and throughput.
2Adaptability or versatility
If multiple overlapping transfer steps are used for different colors, then full color display can be achieved, but fabrication process complexity increases
Solution Approach 1:
The invention merges the transfer operations for red, green, and blue micro-LEDs into a single simultaneous transfer step. By designing the substrate with all three color zones present before transfer, the system combines what would traditionally be three separate operations into one, reducing fabrication complexity while maintaining full color display capability.
Solution Approach 2:
The invention performs preliminary organization of all color micro-LEDs on the substrate before the transfer step. By pre-arranging red, green, and blue micro-LEDs in their respective zones on the substrate, the system eliminates the need for multiple sequential transfer operations, simplifying the fabrication process while ensuring proper color placement.
3Manufacturing precision
If smaller light emitting elements are used to increase density, then display resolution improves, but manufacturing difficulty increases
Solution Approach 1:
The invention segments the high-density micro-LED array into manageable non-overlapping zones on the substrate, each zone containing smaller micro-LEDs of a specific color. This segmentation allows standard manufacturing equipment to handle smaller elements more easily while maintaining the overall high density and resolution through the organized zone structure.
Data Source
AI summary
A method for transferring one or more clusters of micro-LEDs to a display panel includes fabricating or loading a plurality of micro-LED clusters comprising two or more micro-LEDs onto a substrate, and positioning the substrate in a first position. At least a first micro-LED cluster is aligned with at least a first electrical connector on a display panel. The method also includes lowering the substrate toward the display panel such that the first micro-LED cluster contacts the first electrical connector, and releasing the first micro-LED cluster from the substrate.