LEDinside hosted Micro LEDforum 2018 last week in Taipei, Taiwan and welcomed international speakers and attendees to join the pioneer event of the industry. Several leading institutes shared their innovative approaches of Micro LED and the technology of mass transfer is definitely the biggest focus. QMAT, a U.S. based start-up company, was one industry representative who introduced the mass transfer method.
(Francois Henley, CEO, QMAT)
The mass transfer technology developed by QMAT was Beam-Addressed Release (BAR) which utilizes laser beam to quickly transfer a massive amount of Micro LEDs from source substrate to target substrate. The CEO of QMAT, Francois Henley, introduced its technology while addressing the importance of testing, which is essential for ensuring the yield, according to Henley.
QMAT put emphasis on lowering the defect rate of micro LED before the steps of assembly and connection for the aim to realize zero ppm defect and high throughput in the mass transfer process. Thus QMAT proposed in-process test with photoluminescence (PL) and electroluminescence (EL) test. During the presentation, Henley showed the result of PL and EL test and disclosed that measuring in EL mode could detect more defects. According to QMAT, the in-process test can efficiently eliminate the substrate material and Micro LED process defects and the result helps to reduce the time and cost for repairing and subsequent process.
Henley also shared his insights of Micro LED application roadmap. He considered using Micro LED backlight units to make better displays with good yield and performance for TVs and cellphones. As for native Micro LED, it will begin with large displays and small displays with low resolution such as wearable devices.
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