Keystone Technology Co.,Ltd., together with its subsidiaries, engages in the research, development, production, and sale of semiconductor display devices, specialty adhesive materials, and photomasks in China and internationally. The company offers semiconductor display devices comprising polarizers, functional components, signal connectors, LCD panels, and various production consumables for use in LCD TVs, smartphones, tablets, laptops, wearable devices, and other display terminals with screens. It also provides specialty adhesive materials consisting of tapes, fasteners, foams, protective films, and labels for use in the industrial, rail transportation, and automobile industries. In addition, the company offers semiconductor photomasks used in semiconductor chip manufacturing; and 4K and 8K ultra-clear modules. It exports its products. Keystone Technology Co.,Ltd. was founded in 2002 and is headquartered in Nanjing, China.