Plaintiff
1 case as plaintiff.
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Overview. "CSOT" is the common short name for TCL China Star Optoelectronics Technology Co., Ltd. (formerly Shenzhen China Star Optoelectronics Technology Co., Ltd., renamed in November 2019). Founded in November 2009 and headquartered in the Guangming District of Shenzhen, Guangdong, it is a semiconductor-display manufacturer and an unlisted subsidiary of TCL Technology Group Corporation, which is listed on the Shenzhen Stock Exchange (000100.SZ). Company materials cite more than 40,000 employees and cumulative investment exceeding RMB 280 billion across 11 panel production lines, with bases in Shenzhen, Wuhan, Huizhou, Suzhou, Guangzhou and India. TCL Technology Group reported 2024 operating revenue of RMB 164.8 billion; the display segment (CSOT) contributed RMB 104.3 billion.
Operations. CSOT manufactures display panels and modules: large-size a-Si/oxide TFT-LCD TV panels, IT panels (monitors, gaming monitors, notebooks, tablets), commercial displays (interactive whiteboards, video walls), automotive displays, and small/medium-size LTPS LCD and flexible AMOLED/LTPO smartphone and wearable panels, plus touch modules. It is developing printed OLED, Mini LED and Micro LED technologies under its APEX brand, and completed the acquisition of LG Display's Guangzhou/China LCD entities in 2025.
Litigation posture. CSOT is an operating company, not a non-practicing entity. The tracked data shows one appearance, as plaintiff/petitioner, and zero defendant appearances. That single appearance is a PTAB inter partes review, not a district court infringement suit — effectively a defensive counterattack against Samsung Display's OLED patent campaign rather than NPE-style assertion of an acquired portfolio. Notably, the petitioner of record in the underlying proceedings is CSOT affiliate Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
Notable case. BOE et al. v. Samsung Display Co., Ltd. (PTAB, filed 2023-07-27) was a joint petition by Mianyang BOE, Wuhan CSOT, Tianma Microelectronics and Visionox challenging Samsung Display OLED patents (e.g. U.S. Pat. Nos. 7,414,599; 9,330,593; 9,818,803). It followed Samsung Display's December 2022 ITC complaint against U.S. wholesalers and its parallel district court suits, including in the Eastern District of Texas, against BOE. PTAB panels largely upheld Samsung Display's patents in final written decisions issued in late 2024 and 2025.
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Joint IPR petition by BOE, CSOT, Tianma, and Visionox against Samsung Display's US 9,330,593. BOE filed to terminate before institution, Samsung Display did not oppose, and the proceeding was recorded as a procedural termination.