1. School of Electrical Engineering, Kookmin University, Seoul 02707, Republic of Korea
2. R&D Center, LG Display Co., Paju 10845, Republic of Korea
3. OLED TV Business Unit, LG Display Co., Paju 10845, Republic of Korea
4. Circadian ICT Research Center, Kookmin University, Seoul 02707, Republic of Korea
5. Korea Research Institute of Standards and Science, Daejeon 34113, Republic of Korea
6. School of Electrical Engineering, Hanyang University, Ansan 15588, Republic of Korea