Micro-LED Assembly via Electric Field Alignment in Grooved Substrates
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Solution Overview
Problem
The challenge in manufacturing micro-light-emitting diode display devices lies in accurately and stably assembling the small micro-light-emitting diodes on a driving backplane, as their small size makes precise installation difficult.
Innovation Solution
The use of a substrate with grooves and dielectric layers on the micro-light-emitting diodes, where an external electric field drives the diodes to move and align correctly within the grooves, ensuring accurate electrical connection through designed contact structures, such as circular and ring-shaped pads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If micro-light-emitting diodes are used to reduce display device volume, then the display device achieves small size, high contrast, low power consumption, and fast response time, but the manufacturing difficulty increases due to the challenge of accurately and stably assembling the small micro-light-emitting diodes on a driving backplane
Solution Approach 1:
The substrate is pre-designed with grooves and connecting portions (first and second connecting portions) before the micro-light-emitting diodes are assembled. This preliminary preparation of the substrate structure enables accurate and stable assembly by providing pre-defined positioning and electrical connection structures, resolving the manufacturing precision challenge while maintaining the small form factor benefits
2Ease of manufacture
If traditional assembly methods are used for micro-light-emitting diodes, then the manufacturing process is simpler, but the assembly accuracy and stability deteriorate
Solution Approach 1:
The first and second connecting portions on the substrate act as intermediary structures that facilitate the assembly of micro-light-emitting diodes. These connecting portions provide both mechanical support and electrical connection functions, serving as mediators between the substrate and the micro-light-emitting diodes, thereby improving assembly stability without significantly complicating the manufacturing process
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 method enables precise and stable installation of micro-light-emitting diodes on the substrate, improving the assembly process and ensuring reliable electrical connections, thus enhancing the performance and reliability of the display device.
Implementation Method 1
Each of the micro-light-emitting diodes can include at least one dielectric layer, so that the micro-light-emitting diode can be driven by an external electric field to move toward the corresponding groove during the fluid self-assembly procedure
Data Source
AI summary
A light-emitting diode display device includes a light-emitting diode and a substrate. The light-emitting diode includes a central axis, and the substrate includes a first connecting portion and a second connecting portion. The central axis is extended through the first connecting portion. The second connecting portion is disposed outside of the first connecting portion and is spaced apart from the first connecting portion by a distance which is greater than zero, and the first connecting portion and the second connecting portion are respectively electrically connected to the light-emitting diode.