Dr. Joohan Kim | UBI Research: Why do future wall-sized TVs need to be 20-30 times brighter than today's OLEDs?

What are the 5 biggest cost drivers in MicroLED TV manufacturing, and how can they be reduced by over 50%?

Dr. Joohan Kim breaks down the manufacturing cost of a 100-inch MicroLED TV, revealing the five most significant cost centers. The MicroLED chips themselves account for the largest portion at 25%, followed by the tiling process at 20%. The remaining key costs are chip bonding (12%), the repair process (10%), and the mass transfer process (7%), highlighting that the assembly and yield-related steps collectively represent a massive portion of the total expense.

The path to cost reduction lies in targeted engineering improvements across these key areas. A critical focus is on the transfer process, where improving the yield from the current 99.99% ("four nines") to 99.999% ("five nines") is a primary goal. This is achieved by tightening the placement accuracy of the transfer equipment, reducing the distribution of misplaced LEDs and ensuring they are perfectly centered on their target pads.

Improving transfer yield has a direct and dramatic impact on the subsequent repair costs. Current repair processes, which address misplaced or defective LEDs one by one, can take several hours per display module. By reducing the number of initial defects through better transfer and developing new simultaneous repair techniques, the total repair time could be cut to less than an hour. This would slash the repair cost's contribution to the total manufacturing cost to less than 1%, a key step in making MicroLED TVs commercially viable.

In this short video, you can learn:
* The top 5 cost components in producing a 100-inch MicroLED TV.
* Specific engineering targets for reducing transfer and repair costs.
* How improving transfer yield from 99.99% to 99.999% dramatically lowers repair time and cost.
📋 **Clip Abstract** Dr. Joohan Kim provides a detailed cost breakdown for a 100-inch MicroLED TV, identifying the top five cost drivers including the chip, tiling, and transfer processes. He then outlines a clear engineering roadmap to significantly reduce these costs, focusing on improving transfer yield and developing simultaneous repair techniques.
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Why does a 30% accuracy gap between PL and EL inspection create a "garbage in, garbage out" crisis for MicroLED manufacturing?

The single biggest obstacle for the MicroLED industry is managing incoming LED chip defects, a problem rooted in the complex integration of two different industries: semiconductor wafer fabrication and display panel assembly. Unlike monolithic displays, MicroLED panel makers receive millions of tiny, discrete chips from an external supplier. Without a robust method to screen out defective chips before the costly mass transfer process, the entire manufacturing line is subject to a "garbage in, garbage out" scenario, where final display yield is compromised from the very start.

The core technical challenge is the discrepancy between the two main methods of wafer-level inspection: Photoluminescence (PL) and Electroluminescence (EL). PL inspection, which uses light to excite the LED material and measure its response, is the most common method used in manufacturing today. However, it does not always correlate perfectly with the chip's actual performance when driven by an electrical current, which is what EL inspection measures. EL provides a much more accurate prediction of the final pixel performance but is historically more difficult and slower to implement at the wafer scale.

Dr. Kim highlights a reported accuracy gap of up to 30% between PL and EL test results, a figure he corroborates from his own extensive industry experience. This massive discrepancy makes it nearly impossible for engineers to perform effective yield analysis. They cannot easily distinguish between a defect that was inherent to the incoming wafer and one that was introduced during the panel maker's transfer or bonding process, severely hampering efforts to identify root causes and improve overall manufacturing yield.

In this short video, you can learn:
* The fundamental supply chain challenge of integrating chip makers and panel makers.
* The critical difference between Photoluminescence (PL) and Electroluminescence (EL) inspection for MicroLEDs.
* Why the reported 30% discrepancy between PL and EL results is a major roadblock for yield engineering.
📋 **Clip Abstract** Dr. Kim identifies incoming LED chip defects as the biggest obstacle for the MicroLED industry, stemming from the disconnect between chip and panel manufacturers. He explains the critical technical challenge of wafer-level inspection, where the 30% accuracy gap between PL and EL methods creates a "garbage in, garbage out" scenario that hinders yield improvement.
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