We prototyped a 6.0-in. color sequential XGA LCD using an oxide semiconductor. A color sequential LCD has lower power consumption than a color filter LCD because light use efficiency is better. We utilize the low I off of the oxide semiconductor and make frame rate lower, which leads to the lower power consumption of drivers. The color sequential LCD can have a monochrome electronic paper function with a white backlight on.

C‐axis‐aligned crystalline‐oxide semiconductor field‐effect transistor (CAAC‐OS FET) can be scaled down to a width and a length of 60 nm. We fabricated an organic light‐emitting diode (OLED) display with more than 5000 ppi, which is required in virtual reality (VR) display applications, using CAAC‐OS FETs as the backplane.

We recently succeeded in manufacturing a 3.4 inch QHD OLED display (326ppi) with high aperture ratio, 40%, in which we adopted the white OLED using a tandem structure and a color filter method. Besides, we achieved 40% lower the power consumption of the driver circuit (60mW) by improving it.

-A prototype 13.3-inch 8k4k 664-ppi high-resolution foldable organic light emitting diode display is constructed. C-axis aligned a-b-plane-anchored crystal In-Ga-Zn oxide field effect transistors designed using a 1.5-μm rule process are used in the backplane. Each pixel circuit has three transistors and one capacitor, and an external circuit is used to correct pixel current.

A prototype of an 8.34 inch, 1058 ppi 8K4K display is fabricated. This display shall use top-gate self-aligned-type crystalline oxide semiconductor field-effect transistors as the backplane, and will be the smallest 8K display in the world.