World's first 55‐inch OLED TV has been developed and recently launched mass production with excellent display image quality. We employ IGZO TFT backplane and white OLEDs with WRGB pixel design. Those technologies enable panel size scalability as well as mass production with lifetime reliability. For commercializing large‐size OLED TV, the issues and challenges on panel design and driving, including LG Display's recent experience will be presented.

In this paper, we present novel OLED display technologies for large-size UHD OLED TVs, including an IGZO TFT backplane, an RGBW pixel structure with white OLED, driving schemes and compensation methods applied to the panel. We also discuss technical issues and challenges in panel design and driving methods to compensate non-uniformities of oxide TFTs, OLED devices, color, and luminance. Using these technologies, we have successfully launched 55-, 65-and 77- inch UHD OLED TVs. Currently we focus on technologies to achieve higher image qualities, a wider color range and a higher cost competitiveness in the TV market.

In this paper, we suggest panel design schemes for large size OLED panel. With considerations on the reliability of oxide TFT, new pixel circuit is proposed to compensate threshold voltage shift of TFT and is designed in each WRGB sub‐pixel. Also, the panel design concept for improving power supplying is explained. Low resistivity Cu metal is used to allow large panel current with uniformly supplying power voltage. 55‐inch panel is successfully fabricated and demonstrated. Oxide TFT and white OLED with color layers are promising technologies for OLED TV.

We present a novel OLED display panel with high-reliability integrated gate driver circuit using IGZO TFTs. Our gate driver circuit can drive a large-sized OLED display not only for displaying images but also for sensing TFT characteristics for external compensation. It functions correctly even when the threshold voltage of TFTs is negative by reducing leakage currents. We have achieved a life time longer than 60,000 hours in a reliability test and successfully applied it to 55-inch UHD, 65-inch UHD and 55-inch FHD OLED displays, which improves cost-competitiveness of OLED displays against LCDs.

In this paper, we present the novel 88‐inch 8K OLED display for premium large size TVs. New key technologies are applied to 8K OLED display, including a coplanar type IGZO TFT backplane, simple pixel structure with white OLED, current compensation method, large area high speed GIP, pixel charging rate improvement, and driving system with two chip timing controllers. Those technologies enable high image quality characteristic and high reliability of OLED panel. Using the developed 8K OLED displays, we have successfully launched 88‐, and 77‐inch 8K OLED TVs.