1. Institute of Textiles and Clothing The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong 999077 China
2. National & Local Joint Engineering Research Center of Semiconductor Display and Optical Communication Devices, South China University of Technology Guangzhou 510641 China
3. Research Institute for Intelligent Wearable Systems The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong 999077 China
4. Research Institute for Smart Energy The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong 999077 China