1. Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Shanghai 200072 P. R. China
2. School of Mechatronic Engineering and Automation Shanghai University Shanghai 200072 P. R. China
3. School of Microelectronics Shanghai University Shanghai 200444 P. R. China
4. Research Institute of USV Engineering Shanghai University Shanghai 200444 P. R. China
5. School of Materials Science and Engineering Shanghai University Shanghai 200072 P. R. China
6. Anhui Sholon New Material Technology Co., Ltd. Chuzhou Anhui Province 239500 P. R. China