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.

We report a 55-inch OLED TV employing white organic light emitting device (WOLED) and oxide TFT. We fabricated the hybrid tandem structure comprising a phosphorescent R/G stack and a fluorescent blue stack to achieve high current efficiency of 90cd /A at 1,000 nit and white color (0.327, 0.344). 55-inch OLED TV was adjusted to cool white color of (0.285, 0.294). We applied a color layer for large color gamut (118% ATSC ratio) and deep blue expression (0.142, 0.054). We also improved 3 kinds of color shift over viewing angle, aging and gray level.

Large-sized OLED displays require advanced technologies to realize mass production. The competitiveness of OLED TV comes from the combination of oxide TFT and WRGB OLED technology. Those technologies including image quality of OLED TV, oxide TFT, WOLEDs, and solid phase encapsulation enable panel size scalability as well as mass production with lifetime reliability. We will introduce technological progress for commercializing large-sized OLED TV.

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.