A research team centered on Prof. Takao Nobuya of the Graduate School of Engineering, The University of Tokyo published on February 18, 2018: A thin and light "skin display" was jointly developed with the Great Japan Printing Company. This is a system that integrates skin sensing and skin display. It can measure human signals and display by intimate contact with the skin. Therefore, personal health management can be easily achieved at home.
This newly developed "skin display" embeds 16 * 24 micro LEDs at equal intervals on a thin, flexible, and flexible rubber substrate. The thickness of this rubber substrate is about 1mm. The repeated shrinkage of the rubber substrate (shrinkage rate of 45%) will not affect its electrical and mechanical characteristics. It is said that even if it is directly attached to the skin, it will not hinder the movement of the human body, and at the same time, it will reduce the burden on people when dressing.
Regarding the display resolution, the maximum extended state is 4mm, the effective area is 64 * 96mm, the minimum contracted state is 2.4mm, and the effective area is 38 * 58mm. The size of the micro LED unit is 1 * 0.5mm, the emission wavelength is 630nm, the driving voltage is 2V, and the maximum power is 13.8mW.
The above is a thin, free-flexible skin display. 16 * 24 micro LEDs are embedded at equal intervals on the rubber substrate. The thickness is about 1mm. Repeated expansion and contraction (45%) The electrical and mechanical characteristics will not change (click on the image to enlarge display).
Another feature of this development is that the durable durability of the rubber substrate is achieved. When hard electronic parts such as LEDs are used in combination with shrinkable flexible wiring materials, a large stress will occur in the part where the two materials are combined, which can easily cause malfunctions. This development avoided the stress concentration and solved the problem. Moreover, the wiring is flexible, using silver wiring technology using screen printing, and using inlays and soldering processes on the micro LED mounting. These are existing technologies, which have the potential to increase mass production and reduce costs. Sex.
The research team is also developing a skin sensor using nano-mesh and wireless modules. Directly attached to the skin, you can measure ECG. The system integrated with "skin display" can display the measured electrocardiograms with animation, therefore, from the measurement of human body signals to the display of information, no burden will be imposed on the user, and health management can be carried out naturally. In this study, the animation of the stored ECG was also displayed on the rubber substrate display.
The display can show the electrocardiogram measured by the skin sensor in the form of animation. By using an integrated system with "skin display", because it is just attached to the skin, it is lightweight and does not burden users.
Regarding the joint research results, they considered mass production within three years, so the future research and development directions are: optimization of production equipment structure, improvement of reliability, highly centralized manufacturing process and expansion of display size.
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