The opportunities and challenges of developing OLED defect inspection technology and equipment for CELL segment were analyzed， and the OLED detection technologies， testing equipment and the popular equipment manufacturers for CELL segment were listed. Core products and technologies were classified and introduced. From the research point of view， the research contents of CELL segment were also classified and summarized， such as bright spot inspection， dark spot inspection and MURA detection， and the advantages and disadvantages of different methods were analyzed. Finally， the possible trends of CELL segment OLED inspection technology and equipment in the next few years were presented and discussed.