Keystone Technology Co., Ltd. researches, develops, produces, and sells semiconductor display devices, specialty adhesive materials, and photomasks in China and internationally. Its display devices include polarizers, functional components, signal connectors, LCD panels, and production consumables used in LCD TVs, smartphones, tablets, laptops, wearables, and other screen-based terminals. Specialty adhesive materials include tapes, fasteners, foams, protective films, and labels for the industrial, rail transportation, and automobile industries. The company also offers semiconductor photomasks for chip manufacturing and 4K and 8K ultra-clear modules, and exports its products. Founded in 2002, it is headquartered in Nanjing, China.