Joonhyuk Cho (Ph.D). has been Chief of R&D center at exax Inc. since 2015 with leading R&D of chemical materials for electronic devices, especially optical resin, photoresist and silver paste. Prior to joining exax Inc., Dr. Cho was principle engineer position for Samsung display. During his 5 years at Samsung display, Dr.Cho spent time planning R&D strategy of OLED display, especially foldable display. Dr. Cho received a Ph.D degree in Conducting Polymer science from Seoul National University, Seoul, Korea.