In this paper, we report a 3.4‐inch flexible top‐emitting AMOLED display with remarkably high resolution using oxide TFTs. Our transfer technology has an advantage of fabricating high‐performance TFTs and a high‐resolution AMOLED Display on a flexible substrate.

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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We developed a high‐performance 3.4‐in. flexible active‐matrix organic light‐emitting diode (AMOLED) display with remarkably high resolution using an oxide semiconductor in a backplane, by applying our transfer technology that utilizes metal separation layers. Using this panel, we also fabricated a prototype of a side‐roll display for mobile uses. In these AMOLED displays, a white OLED combined with a color filter was used in order to achieve remarkably high resolution. For the white OLED, a tandem structure in which a phosphorescent emission unit and a fluorescent emission unit are serially connected with an intermediate layer sandwiched between the emission units was employed. Furthermore, revolutionary technologies that enable a reduction in power consumption in both the phosphorescent and fluorescent emission units were introduced to the white tandem OLED.

In this study, the device structure of a white tandem OLED is changed to control the emission area to achieve less luminance decay. A long‐life 13.5‐inch 4K flexible CAAC‐OS AMOLED with less color shift and high resolution is fabricated using this long‐life white OLED, transfer technology, and a CAAC‐OS FET.