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.

Based on a two-prong type quartz tuning fork, a force sensor with a high Q factor, which we call a retuned fork sensor, was developed for non-contact atomic force microscopy (nc-AFM) with atomic resolution. By cutting a small notch and attaching an AFM tip to one prong, its resonance frequency can be retuned to that of the other intact prong. In balancing the two prongs in this manner, a high Q factor (>50 000 in ultrahigh vacuum) is obtained for the sensor. An atomic resolution image of the Si(111)-7 × 7 surface was demonstrated using an nc-AFM with the sensor. The dependence of the Q factor on resonance frequency of the sensor and the long-range force between tip and sample were measured and analyzed in view of the various dissipation channels. Dissipation in the signal detection circuit turned out to be mainly limited by the total Q factor of the nc-AFM system.

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.

We have developed a transmissive organic light‐emitting diode (OLED) and a reflective liquid crystal (LC) hybrid display (TR‐Hybrid display). The TR‐Hybrid display serves as a reflective liquid crystal display (LCD) under external light and as an OLED display in dark environments. It exhibited superior visibility and low power consumption.

Viewing angle performance of flexible organic light-emitting displays (FOLEDs) with red-green-blue (RGB) side-by-side (SBS) architecture plays a major role in the visual appearance in the curved state. In particular, viewing the display from a centralnormal vantage point, the color shift becomes visible when viewing the bent edges of the display. The viewing angle performance of a color-by-white FOLED was measured goniometrically and compared with a SBS FOLED. Keywords Curved displays; flexible displays; AMOLEDs; metrology; viewing angle. P-193 / J. Kimmel SID 2017 DIGEST • 1993 ISSN 0097-966X/17/4703-1993-$1.00 © 2017 SID P-193 / J. Kimmel SID 2017 DIGEST • 1995