Beijing time, August 16, even in some period of disagreement, people seem to be a few things can agree on: the baby is very lovely, on lego blocks is wrong, and people need new ways to play the latest video games. Although the last may not be so widespread, but electronic device which can be used in the human body may be very useful for medical industry and the individual consumer.

Scalable trackpad make arm piano In view of this, the researchers have developed a highly scalable touchpad, it can be used to write and play video games. The research and development or can lead to have various use of flexible, wearable device.

For a long time, even though such as carbon nanotubes and metal nanowires are different types of conductors type touch panel test is used to extend, but the material can't keep a good state when repeatedly stretched. To solve this problem, researchers have developed a water gel made of touchpad. Hydrogel is a hydrophilic polymer network, they are soft and the extension is very good.

Because of the hydrogel is almost all water, researchers can dissolve ion to the panel, freedom by allowing the current. New product use of the conductor containing lithium chloride polyacrylamide hydrogel. End electrode hydrogel panel can apply similar voltage, which can establish average electrostatic field in the whole system. When the finger touch panel, it can close the circuit inside the hydrosol, let the current flow from both ends to touch point.

In every corner, can capture the current instrument can detect electrical signals; The researchers developed a control panel to promote the communication between the ion touch panel and computer. The thin layer trackpad on arm, they can write, on her play the piano and play games. Researchers report in the journal science, said that even if the stretch 10 times, the touchpad is still to work.

But there are still a large room to improve the technology, at present, the there are still lack of rigor and durability. After nearly hundred times stretching, the researchers found that the resistance will increase slightly, it may be that the evaporation of the water in the hydrogel. While you study in the hydrogel keyboard "twinkle twinkle little star" to be the next Chopin, but one day can have a flexible touch pad attached to the body, may not be such a long time.