In July 2020, a research team by Dr. Takao Someya of the University of Tokyo and Dai Nippon Printing Co., Ltd. (DNP) announced that they have developed a thin, stretchable “full-color skin display”. It can be pasted directly on the back of the hand, and the displayed content can be controlled externally via BLE (Bluetooth Low Energy).
source: Tokyo University
Until now, the joint research team of the University of Tokyo and DNP has been conducting research such as “stretchable hybrid electronic packaging technology” toward the development of stretchable devices. In order to confirm the usefulness of this technology, we have developed a skin display in which 12×12 (144) color LEDs and elastic wiring are embedded in a thin rubber sheet.
The display device integrates a full-color skin display capable of expressing over 9,000 colors, its drive circuit, communication circuit, and power supply. The total thickness is about 2 mm. Repeated expansion and contraction up to 130% does not impair electrical and mechanical properties. The drive voltage of the display is 3.7V, the display speed is 60Hz, and the maximum power consumption is 100mW on average. It is said that it is superior in atmospheric stability and mechanical durability compared to the conventional stretchable display using EL.
This is the first time that a stretchable display is attached directly to the skin and 100 or more LEDs all operate normally and can display full-color video while following the movements of a person. Copper is used as the wiring material. Since it can be manufactured by a method that works in mass production, it is expected to be put to commercial use at a low cost.