1. Department of Information Display; Kyung Hee University; Dongdaemoon-Gu Seoul 02447 Republic of Korea
2. Division of Industrial Metrology; Korea Research Institute of Standards and Science; 267 Gajeong-ro Daejeon 34113 Republic of Korea
3. Material Science; 196, Gasandigital 1-ro, Geumcheon-gu Seoul 08502 Republic of Korea