On June 6, a research team led by Professor Yongtaek Hong from the Department of Electrical and Computer Engineering at Seoul National University announced the development of a new technology for connecting Micro LEDs to flexible and stretchable devices.
The researchers employed a dip-transfer coating technique to selectively pattern adhesive precursors onto the surfaces of micro-sized devices. This adhesive contains ferromagnetic particles that self-assemble into anisotropic chains under a magnetic field. This method provides low contact resistance for device interconnection, while avoiding electrical interference between closely spaced terminals.
In addition to assembling flexible and stretchable Micro LED arrays, the technology can be used to create Micro LED display devices that can adhere to the skin, enabling the detection of body temperature and visualization of data on the display.
The research team explained that the new technology addresses issues related to the rigidity of anisotropic conductive film materials, which can lead to lower elasticity and flexibility of electrodes and substrates, as well as the low bonding stability caused by the softness of the adhesive.
According to the team, the new technology allowed them to integrate micro IC drivers and LED display units onto a flexible PCB, resulting in an ultra-miniature wearable display and sensor system that is smaller than existing commercial micro IC chips.
The team stated that this new technology enables the systematic integration of high-performance microelectronic devices while maximizing the mechanical properties of flexible and stretchable systems, and will contribute to the commercialization of flexible displays.
This research was supported by Samsung, and the findings have been published in the academic journal Nature Electronics.
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