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The low-power display technology of liquid crystal display (LCD) including crystalline IGZO by variable frame frequency has been previously reported. Application of the technology to controller and processor unit as well as the LCD and the driver(s) proposes a method for saving power of the whole display system.

A low-power normally-off microcontroller unit (NMCU) having state-retention flip-flops (SRFFs) using a c-axis aligned crystalline oxide semiconductor (CAAC-OS) such as indium gallium zinc oxide (IGZO) transistors and employing a distributed backup and recovery method (distributed method) is fabricated. Compared to an NMCU employing a centralized backup and recovery method (centralized method), the NMCU employing the distributed method can be powered off approximately 75 µs earlier after main processing and can start the main processing approximately 75 µs earlier after power-on. The NMCU employing the distributed method can reduce power overhead by approximately 85% and power consumption by approximately 18% compared to the NMCU employing the centralized method. The NMCU employing the distributed method can retain data even when it is powered off, can back up data at high speed, and can start effective processing immediately after power-on.The NMCU could be applied to a low-power MCU. Single crystalNanocrystal CAAC Fig. 1. (Color online) OS crystal structures.

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A low-power normally off microcontroller unit (NMCU) having state-retention flip-flops using c-axis aligned crystalline In-Ga-Zn-oxide TFTs and employing a distributed backup and recovery method is fabricated. The NMCU employing a distributed backup and recovery method can reduce power overhead by about 84 and power consumption by about 22 compared to an NMCU employing a centralized backup and recovery method. Further, the NMCU can start main processing after a power on sequence about 74 s earlier.

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