Seiichi Mizukoshi

8.1: Invited Paper: Advancements and Outlook of High Performance Active-Matrix OLED Displays

By introducing new terminology, active-matrix OLEDs advanced performance can be well characterized. “Luminous Flux” and Assured Dynamic Range” better represent the viewers impression than previous terminology such as “front luminance” and/or “viewing angle.” Compensation circuit, low-stress driving technique, CVD condition, TFT shape, and high-efficiency OLEDs are the keys to enabling low-cost a-Si AMOLED manufacturing in order to compete with other display technologies.

3.2: Digital Drive with White OLEDs

2T1C digital drive has been investigated with stable white OLEDs. A 2.5″ QVGA digital drive AMOLED prototype exhibited quite stable lifetime under constant voltage stress. The lifetime (T50) of an OLED device with 40% aperture ratio was over 5,000 h at an initial condition of 442 cd/m2 while the T50 at an initial condition of 175 cd/m2 is estimated to be over 20,000 h even under constant voltage stress. Motion artifacts are also improved with an automatic refresh rate conversion with less impact on power consumption.