7층 적층구조 배면/전면 청색 인광 OLED 특허 동향분석

Displays of various sizes and shapes are required for different applications such as large TVs, smartphones, and tablet PCs. In particular, displays should provide a clear picture quality with a small thickness, and there are many requirements in terms of power consumption. In this situation, research on the efficiency and lifespan of blue, which was considered unfeasible, is actively being conducted. In order to improve the efficiency of OLED, the efficiency of OLED must be improved by improving the light emission method of the device, improving carrier injection, developing a device structure that allows electrons and holes to efficiently recombine in numerical balance as well as the development of new developing materials with high luminous efficiency. In this study, patent trends according to the Bottom/Top emission method of the device, electron or hole blocking in a 5-layer structure with the addition of Electron or Hole Injection Layer(EIL or HIL), Electron or Hole Transport Layer (ETL or HTL) were analyzed. In order to give better strategy for the development of a EBL and HBL added 7-layer structure, trends in major domestic and foreign countries were additionally analyzed using objective indicators of patents.