1. Department of Materials Science and Engineering, Yonsei University, Shinchon-Dong 134, Seodaemun-Gu, Seoul 120-749, Korea
2. R&D 6 Team, LGDISPLAY Co., Ltd., 1007 Deogeun-Ri, Wollong-Myeon, Paju-Si, Gyeonggi-Do 413-811, Korea
3. LCD R&D Center, LCD Business, Samsung Electronics Co., Ltd., Yongin-City, Gyeonggi-Do 449-711, Korea