JDI sells its Mobara fab to Shinko Electric Industries, a move analysts view as a strategic pivot from obsolete display capacity to high-value advanced packaging.
On September 30, Japan Display Inc. (JDI) sold its Mobara factory in Mobara City, Chiba Prefecture, to Shinko Electric Industries, with the site handover scheduled for March 31, 2027. The industry offers two diametrically opposite interpretations of this transaction.
One view is that obsolete display capacity has finally found a buyer. The Mobara factory was once JDI’s primary site for supplying LCD panels to the iPhone, but orders collapsed as smartphones shifted to OLED. JDI decided to halt production in February 2025 and actually stopped lines in November of the same year. By the end of March 2026, JDI had posted net losses for 12 consecutive fiscal years, with net assets at negative 7.4 billion yen. Selling such an asset is itself a success.
The other view, which I favor, is that the factory’s physical conditions are perfectly suited to the most critical gap in advanced packaging.
A 6th-generation (G6) glass substrate measures approximately 1500mm x 1850mm, with an area close to 2.8 square meters; a 300mm wafer is only about 0.07 square meters, a difference of nearly 40 times. Panel-level packaging (PLP) and fan-out panel-level packaging (FOPLP) are frequently cited, and the arithmetic is simple: coating, exposure, electroplating, and cleaning steps can process a panel area an order of magnitude larger, thereby diluting the cost per unit area.
There are few facilities capable of accommodating such large panels. Globally, there is a limited number of vacant factories equipped with G6 or larger panel production lines and complete utility infrastructure. The Mobara site covers a total area of 373,483 square meters, of which the western 232,745 square meters are transferred to FICT, while the eastern section is retained by Shinko Electric Industries.
Total Site Area (m²)
JDI Sale Gain (Yen)
2028
Target Fiscal Year for Production
These three figures represent: the total area of the Mobara site, the 51.4 billion yen sale gain JDI expects to recognize in the quarter ending March, and the fiscal year 2028 target for production set by Shinko Electric Industries. According to JDI’s announcement, the transaction price was not disclosed, and the book value of the factory is approximately 26.6 billion yen.
The deal does not give Shin-Etsu Handotai sole control of the entire site. The 233,000-square-meter western section was allocated to FICT, a semiconductor substrate maker headquartered in Nagano City. FICT’s predecessor was Fujitsu’s printed circuit board business, which was sold to Advantage Partners in 2020, renamed in 2022, and acquired in February 2025 by a consortium led by MBK Partners with participation from FormFactor.
FICT’s product portfolio includes F-ALCS full-layer IVH substrates, G-ALCS glass multilayer substrates, FC-BGA substrates for large chips, and substrates with embedded thin-film capacitors. By positioning FICT in the west and Shin-Etsu Handotai’s flip-chip packaging in the east, the site now covers two key stages of AI accelerator packaging: substrate manufacturing upstream and assembly packaging downstream.
We appreciate Shin-Etsu Handotai and FICT recognizing the value of our facility, which will enable both companies to begin operating an advanced semiconductor packaging plant as soon as possible.
— Source: Jun Akema, President of JDI, announcement dated September 30, 2026
The capabilities it can handle are concentrated in the back-end: redistribution layers (RDL), large-area fan-out, flip-chip packaging and assembly, and the manufacture of large organic and glass substrates. The panel industry’s experience with wet processes, vacuum deposition, large-area exposure, material handling, and warpage control aligns closely with these processes. Warpage control for glass substrates is something the panel industry has mastered over several decades.
What it cannot handle is front-end wafer fabrication. The cleanroom standards of a G6 panel line do not meet the micro-contamination control requirements of semiconductor front-end processes. This limitation has been acknowledged by other potential buyers. According to a September report by South Korean media outlet ZDNet, Micron, several Middle Eastern data center firms, and Korean substrate manufacturers had all submitted letters of intent to acquire the site. Micron’s proposed direction was to convert it into a packaging and testing base, focusing on back-end operations. Reported bid amounts during negotiations were in the range of 500 billion Korean won, but the final buyer and price remain subject to JDI’s official announcement, and the transaction price has not been disclosed.
Here is a falsifiable assessment: After the Shigehara plant begins operations around 2028, it will likely start with mature panel-level fan-out and large-size flip-chip packaging for the first two years, rather than immediately mass-producing glass core substrates. Through-glass via (TGV) processes, warpage matching between glass and package substrates, and supporting materials have not yet reached the stage of large-scale mass production. Pushing a newly renovated legacy plant directly into this area carries disproportionate risk. This assessment can be disproven: if news emerges around 2028 that Shigehara has opened a mass-production line for glass substrates, my judgment will have been wrong.
Shinko Electric's Private Takeover and Strategic Pivot: A Buyer's Perspective on Advanced Packaging Capacity
Shinko Electric, a major supplier of FC-BGA substrates for AI accelerators, was taken private in June 2025 by a consortium led by JIC. The company is now aggressively acquiring legacy facilities to meet surging demand for advanced packaging driven by generative AI and data centers.
The Immediate Post-Exit Priority: Acquiring Fab Space
Shinko Electric, founded in 1946, specializes in package substrates, lead frames, and ceramic electrostatic chucks, with package substrates accounting for nearly 70% of its revenue. Its client base includes Intel and AMD, and it supplies FC-BGA substrates for AI accelerators. In June 2025, a consortium led by JIC, with participation from DNP and Mitsui Chemicals, completed the company's privatization at 5,920 yen per share, delisting it from the Tokyo Stock Exchange. President Susumu Kurashima publicly stated his desire to relist the company as soon as possible.