1. Advanced Display Research Center, Department of Information Display, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea
2. KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 02841, Republic of Korea
3. Division of Electronic and Semiconductor Engineering, Ewha Womans University, Seoul 03760, Republic of Korea