SEJIN T.S CO.,LTD is a Korea-based company engaged in the manufacture of black light sheets for thin film transistor-liquid crystal displays (TFT-LCDs). The Company produces prism protection sheets, diffusion sheets, reflection sheets and panel protection sheets, which are used as main parts for back light units. It also provides various films, such as polycarbonate films, acryl films, co-extrusion films, pattern films and others. As of December 31, 2011, the Company had one China-based subsidiary.