KIMM Develops Mass Transfer Process for Micro LEDs
November 27, 2017
Researchers of the Korea Institute of Machinery and Materials (KIMM) have developed a new technology to facilitate the mass transfer of micro LED manufacturing. Micro LED mass transfer is the most challenging process inhibiting the production of micro LED. Manufacturers need a simple efficient process to carry a large number of micro LED chips and lay them all on a substrate. KIMM, under the Ministry of Science, ICT, and Future Planning, has developed a ‘roll transfer process’ that, it claims, would speed up the mass transfer process, and would make commercialization of micro LED easier, reports Business Korea. The micro LED displays produced by Nano Applied Mechanics Team at KIMM featured a luminous efficacy that is three times higher than that of conventional LED displays. When these displays are powered they needed only 50% of the energy required by a traditional LED display. Currently, equipment used for manufacturing micro LED can mount 100,000 micro LEDs on a substrate per minute. The new roll transfer technology would enable about 600,000 chips to be transferred per minute. KIMM has been granted a patent for the roll-to-roll transfer process. They have discovered that instead of directly placing micro LEDs onto the substrate, first a thin film transistor (TFT) can be put on the substrate and then placed micro LEDs can be placed on the TFT element. An active matrix type of micro LED display can then be completed.