**6. Conclusion**

In this chapter, we have explained the latest progresses in three key technologies, i.e., oxide TFT, WOLED, and advanced compensation circuit and method, applied to brandnew UHD OLED TV. a-IGZO TFTs with coplanar structure have demonstrated excellent electrical and reliability characteristics, which will be a good reference for the future development as well as for mass production of large-sized UHD OLED TVs. New device architectures of three-stack and/or three-color WOLED could realize OLED TV with high luminance and high color gamut. The advanced compensation technologies, including the external compensation method, have enabled a panel size scalability and an enhancement of the lifetime reliability necessary for commercializing large-sized and high-resolution OLED TVs.

Not to mention higher luminance and lower power consumption, OLED TV with higher resolution such as 8 K x 4 K, higher color gamut such as BT2020 and larger size than 80″ should be developed in the future. Although all these are definitely a huge challenge to oxide TFT, WOLED, and advanced compensation technology, it is believed that these will be realized via innovations and breakthroughs coming from momentum of research and development well established in these fields.
