We have developed a highly efficient top-emitting white OLED by employing a stable reflective anode structure and a p-doped buffer layer. Furthermore, combining the white OLED with color filters, we succeeded in fabricating a prototype of a highdefinition AMOLED display having highly reliable OS-FETs as the backplane.

We report a 300mm×360mm flexible FET substrate made by our transfer technology and 3.4-inch full-color AMOLED display with oxide FET flexible substrate. Our transfer technology has advantages in applicability for a large-size substrate and cost performance because laser irradiation is not needed.

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In order to maximize the power efficiency of OLEDs, a novel pdoped layer, which exhibits almost no voltage and optical losses, has been developed. By using this p-doped layer, we succeeded in fabricating a white tandem OLED over 30 lm/W with a high color temperature of 5,400 K and a green OLED of a top emission type over 150 lm/W.

A kawara-type multidisplay providing a seamless, continuous image was fabricated by precisely arranging 13.5-inch organic light-emitting diode (OLED) flexible panels with transparent edges on two adjacent sides. By using 36 panels, an 81-inch 8k4k OLED kawara-type multidisplay, the world's largest display, was fabricated.