On February 11, ETNews reported that a South Korean company is currently developing high-efficiency Micro LED transfer technology. Transfer refers to the process of separating Micro LED chips from the wafer and transferring them to a circuit board. The key question is whether this technology can reduce the manufacturing complexity of Micro LED displays.
LC Square Achieves 99.99% Transfer Yield
LC Square, a South Korean company specializing in Micro LED display technology and product development, announced on February 11 that they have successfully developed transfer equipment capable of achieving a 99.99% yield (4N) when transferring 15µm (1µm = one millionth of a meter) horizontally and 30µm vertically Micro LED chips.
A 99.99% yield means that when transferring 10,000 Micro LED chips, only one will fail, while the remaining 9,999 chips will transfer successfully.
Precision and Innovation in Micro LED Transfer
The 15µm x 30µm size is smaller than the width of a human hair (approximately 50µm). LC Square has developed technology that can accurately handle these ultra-small chips.
The company explained that during the chip carrier (COC) manufacturing process, they use high-speed laser technology to detect and exclude defective components on the LED wafer. Normal components are then used to fill in the gaps, ensuring a 4N yield.
The COC is the first temporary substrate after separating the Micro LED from the wafer. In this process, defective components are removed, and only normal components are used, which are then arranged on the separator to improve yield.
Why LC Square’s Technology Matters
The reason why people are paying attention to LC Square’s technology is because it has the potential to improve the production process of Micro LED display panels.
Micro LED technology, when applied to display panels, outperforms OLED in terms of brightness, contrast, color accuracy, and energy efficiency. It is seen as the next-generation display technology. However, the transfer process of separating the Micro LED from the wafer and attaching it to the substrate, along with the difficulty of the bonding process, makes it a challenging and costly procedure.
As a result, manufacturing costs are high, and the final product price remains expensive. Low yield rates lead to higher material costs, which are the primary factors driving up prices.
LC Square’s Technology and its Impact on Manufacturing Costs
The new technology from LC Square could help reduce these waste factors, making large-scale production of Micro LED display panels more feasible.
The company stated: “We have now achieved a 99.99% yield, and our next goal is to increase the yield to 5N (99.999%) by the end of this year.”
Additionally, the ability to handle 15µm microchips will help reduce manufacturing costs. This makes it possible to transfer smaller components, which means more Micro LEDs can be produced from a single wafer.
Future Goals and the Impact on Micro LED Production
Lee Hyo Jong, CEO of LC Square, remarked, “Ensuring a 99.99% yield for mass production transfer is a key milestone in reducing Micro LED panel manufacturing costs and enhancing product reliability.” He added, “We will continue to improve our yield rates to strengthen our price competitiveness, providing customers with high-quality and innovative cost-reduction benefits.”
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