KOYJ CO., LTD. engages in the manufacture and sale of light crystal display optical part components. It operates through Optical Film Coating and Light Guiding Panel business divisions. The Coating division offers optical functional film, hard coating film with high hardness and for light diffusion, optical and adhesive protection films, and cushion sheet. The Optical division provides roll stamping light guide plate for notebook, television, and monitors. The company was founded on February 16, 2006 and is headquartered in Chungju-si, South Korea.