DKL is an optics and electronic coating film product developing and producing company, and we have established a quality, environment managing system (ISO9001/14001 : 2015). All our staff continues to maintain, manage, and revise to minimize the impact of all of our activities, products, and services have on the environment and quality, for client satisfaction. Ethically operated DKL shares the core values of trust, consideration, challenge, and innovation for the growth of a sustainable company, and meets our responsibilities to society and stakeholders by keeping all the laws and ethical codes. Therefore, we set guidelines for DKL employees, and carry them out.