Chi-Sun Hwang received the B.S. degree from Seoul National University in 1991 and the Ph.D. degrees from Korea Advanced Institute of Science and Technology in 1996, both in physics, and he is principal researcher of the Electronics and Telecommunications Research Institute in Korea. From 1996 to 2000, he worked to make DRAM device at Hyundai Semiconductor Inc. Since 2000, he joined the Electronics and Telecommunications Research Institute in Korea. His research has focused on display technology based on active matrix flat panel display using TFTs, especially oxide TFTs. His recent interests are digital holography, large area flexible electronics, and novel switching devices.