Abstract
Currently, commercially available large-sized OLED displays use white OLED devices. This chapter intends to cover the core technologies of tandem white OLED devices and their applications through white OLED devices have been developed in order to improve performance. The first half explains two-stack and three-stack tandem WOLED structures, which were developed to improve the efficiency of bottom-emitting WOLEDs, and the configuration of a light-emitting layer to increase color reproduction. In addition, it introduces features of products with this technology such as wallpaper OLED, cinematic sound OLED, rollable OLED, and 8K OLED displays. The second half deals with issues such as the viewing angles and power consumption of microcavity top-emitting WOLEDs and introduces the sputtered transparent electrode technology and OLED device characteristics that make up the non-microcavity top-emitting WOLED devices. Additionally, we introduce transparent and flexible transparent OLED displays.
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