KOYJ CO., LTD. engages in the manufacture and sale of light crystal display optical part components. It operates through the following businesses: Optical Film Coating, Light Guiding Panel, Metalworking Auto Parts, and Electromagnetic Organic Material. The Optical Film Coating business offers optical functional films and hard coating films with high hardness and for light diffusion, optical, and adhesive protection films, and cushion sheets. The Light Guiding Panel business light-guiding panels for liquid crystal display's backlight unit. The Metalworking Auto Parts business provides injection auto parts. The Electromagnetic Organic Material business provides semiconductor and electronic organic materials. The company was founded on February 16, 2006 and is headquartered in Chungju-si, South Korea.