Active matrix for OLED displays

Abstract

Significant progress has been made in the past two decades in AMOLED displays. As current driven devices, OLEDs present tremendous challenge in developing the right active matrix backplanes. Various technologies have been and continue to be investigated for driving AMOLEDs. The start of mass production of small size AMOLEDs by Samsung in 2007 established LTPS as the leading backplane technology. However, the scaling of AMOLEDs for large TV applications demands a low-cost backplane technology. This need has propelled the intensive R & D work in oxide TFT backplane, leading to its commercialization in LG’s 55 ″ OLED TV in early 2013. In this chapter, active matrix for OLEDs will be discussed based on the type of backplane technologies. This is followed by several other considerations in designing the active matrix such as the type of transistors and image sticking. In the end, a brief summary and outlook for future research and development will be provided.