We discuss the steps for obtaining a curved touch-enabled display by using a c-axis aligned crystalline oxide semiconductor, OLEDs, a flexible-display technology, and a capacitive touch screen. This result is a side-roll display in which the front and side surfaces are a single curved surface with a 4 mm radius.

A 13.3-inch 8k4k organic light-emitting diode display based on a newly developed highmobility indium-gallium-zinc-oxide material was fabricated. It was found that the use of a highermobility material decreases the scan driver size and power consumption. Furthermore, such oxide semiconductor layers with a buried channel structure can increase process stability and reliability.

In this study, white organic electroluminescent devices with microcavity structures were developed. A flexible high‐resolution active‐matrix organic light‐emitting diode display with low power consumption using red, green, blue, and white sub‐pixels formed by a color‐filter method was fabricated. In addition, a side‐roll touch display was developed in combination with a capacitive flexible touch screen.

We succeeded in developing a deep blue fluorescent OLED exhibiting extremely high external quantum efficiency and a long lifetime by adopting an amine-free material to the hole transporting layer. We have also developed a CAAC-IGZO-FET OLED display with a narrow driver area using this deep blue device.

We have fabricated a 5.5‐inch 4K2K liquid crystal display (LCD) using an oxide semiconductor. The use of an oxide semiconductor layer of a high‐mobility indium‐rich material and a top‐gate structure enables fabrication of a 4K2K LCD with a narrow bezel and an integrated demultiplexer.

We have developed a polymer‐stabilized blue‐phase LCD in which the diffraction wavelength of blue‐phase liquid crystal is in the ultraviolet region and which is driven at a low voltage of V100 = 27 V. Prototypes of 3.4‐in polymer‐stabilized blue‐phase LCDs were made, which include a highly reliable crystalline oxide semiconductor. We succeeded in fabricating not a test cell but a display having a contrast ratio higher than 1000 : 1 for the first time in the world.

We developed a large ultra-high-definition (8K) liquid crystal display with a high aperture ratio by making the source and drain electrodes, wirings, storage capacitors, and contact portions transparent. This increased the aperture ratio from 37.3 to 47.1 and reduced the backlight power consumption by approximately 21 .

A 13.3‐inch 8k4k OLED display using an oxide semiconductor with high‐mobility IGZO material was fabricated. It was found that the use of a higher mobility material can decrease the size and power consumption of a gate driver. Furthermore, a stack of such oxide semiconductor layers can increase process stability.