OnePlus Concept One - the smartphone with "hidden camera" technology. The new One Plus Concept One phone, presented at CES 2020, demonstrated the technology of disappearing rear cameras that are not visible on the case. For this technology, OnePlus used electrochromic glass (EC-glass). The appearance of the concept, as reported, is motivated by the fact that the camera spoils the design of many smartphones, and the appearance of "disappearing" camera technology can give designers the opportunity to go beyond the traditional presentation of phones.