YAS May Join Visionox's 8.6G OLED Expansion Bid as Second-Phase Investment Nears
Chinese display maker Visionox is preparing a follow-on investment for its 8.6-generation OLED production line, with industry attention focused on whether South Korean equipment suppliers such as YAS can secure orders after missing out on the first phase.
According to industry sources on Aug. 6, Visionox is planning a second-phase investment for its V5 fab under construction in Hefei, Anhui Province. While the exact timing has not been finalized, the project is widely expected to begin in the first quarter of 2027.
The V5 facility is designed for a total production capacity of 32,000 glass substrates per month. The first phase covers 8,000 substrates per month, while the second phase will add the remaining 24,000 substrates per monthβthree times the size of the initial investment.
The first phase included equipment supplied by South Korean companies such as AP Systems, SynusTech and ICD. Applied Materials (AMAT) won the order for the deposition equipment, widely considered the most critical tool in the production line. The company began delivering equipment in May and is currently conducting installation, commissioning and process validation for Visionox's ViP technology, a fine-metal-mask (FMM)-less OLED manufacturing process. Yield rates on the line are reportedly in the 30β40% range.
Although both AMAT and YAS deposit organic materials onto substrates by heating solid organic emissive materials in a vacuum environment, their approaches differ significantly.
AMAT uses a vertical deposition architecture in which 8.6-generation glass substrates are positioned upright during processing. The system integrates deposition, substrate transfer and encapsulation processes within a connected vacuum environment. Maintaining uniform film thickness across large vertically transported substrates is a key technical challenge.
YAS, by contrast, employs a horizontal architecture in which substrates remain flat while organic materials are deposited from evaporation sources located beneath them. The system maintains a constant distance between the evaporation source and substrate to ensure uniform film formation across the entire panel. As a result, chamber structures, transfer systems and overall equipment configurations differ substantially from those used by AMAT.
AMAT benefits from operational data and process conditions accumulated from the first-phase V5 line. If Visionox selects the same equipment for the expansion, previously developed deposition recipes and process parameters can be reused. Adopting YAS equipment, however, would require fresh validation of both equipment performance and manufacturing processes because of the different substrate-handling architecture.
Commenting on the possibility of YAS participating in the second phase, a Visionox official said, "We are currently validating the AMAT equipment, but yields remain low and pricing is high. If we adopt YAS equipment, we would need to conduct new verification work, so there are many factors to consider."
Visionox had also previously considered applying the conventional FMM process to portions of the V5 line. In May last year, the company discussed introducing FMM deposition equipment from Japan's Canon Tokki and South Korea's Sunic System. However, it ultimately chose the ViP approach.
According to Visionox, the likelihood of reverting to FMM technology in the second phase remains low.
Asked whether poor yields on the initial ViP line could lead the company to reconsider FMM technology, a Visionox official said, "Even if yields do not meet expectations, there is almost no possibility of returning to the FMM method. If we were to go back to FMM, it would raise questions about the rationale behind the investment, and we do not know whether the Hefei government would approve such a move."
Visionox is expected to determine the supplier for the second-phase deposition equipment based on the results of equipment installation, commissioning and ViP process validation on the first production line.
For the first-phase investment, Visionox selected lithography equipment from Canon, excimer laser annealing (ELA) and laser lift-off (LLO) systems from AP Systems, plasma-enhanced chemical vapor deposition (PECVD) and sputtering equipment from Applied Materials, and certain sputtering tools from ULVAC. Dry etching equipment was supplied by Tokyo Electron and ICD, while logistics and material-handling systems for array and deposition processes were provided by SynusTech.