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Gaming using a stretchy touchpad

Date:
August 11, 2016
Source:
American Association for the Advancement of Science
Summary:
Researchers have developed a highly stretchable touchpad that can be used to write words and play electronic games.
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A researcher uses a new, flexible ionic touchpad, placed on his arm, to play video games.
Credit: C.-C. Kim et al., Science (2016)

Researchers have developed a highly stretchable touchpad that can be used to write words and play electronic games. The development could lead to flexible, wearable devices with a variety of applications. While various types of conductors such as carbon nanotubes and metal nanowires have been explored for stretchy touchpads, they are all based on hard materials.

To help solve this problem, Chong-Chan Kim and colleagues developed a touchpad made of hydrogel, a network of hydrophilic polymers that are soft and very stretchable. They used a polyacrylamide hydrogel containing lithium chloride salts, which act as a conductor and help retain water in the hydrogel.

Electrodes on the ends of the hydrogel panel apply similar voltages, which creates a uniform electrostatic field across the system. When a finger touches the panel, it closes the circuit within the hydrogel, allowing current to flow from both ends of the strip to the touch point.

At each corner of the strip, meters that capture current detect the electrical signals; the researchers developed a controller board to facilitate communication between the ionic touch panel and a computer. Using the touchpad, they were able to draw a stick figure, with the data conveyed onto a computer screen.

With the thin touchpad placed on their arms, they were able to write words and to play the piano and games. The touchpad was still able to operate when it was stretched to more than 1000% of its normal area. After 100 cycles the resistance was found to increase slightly, which the authors suggest may be due to water evaporation in the gel.


Story Source:

Materials provided by American Association for the Advancement of Science. Note: Content may be edited for style and length.


Journal Reference:

  1. C.-C. Kim, H.-H. Lee, K. H. Oh, J.-Y. Sun. Highly stretchable, transparent ionic touch panel. Science, 2016; 353 (6300): 682 DOI: 10.1126/science.aaf8810

Cite This Page:

American Association for the Advancement of Science. "Gaming using a stretchy touchpad." ScienceDaily. ScienceDaily, 11 August 2016. <www.sciencedaily.com/releases/2016/08/160811143224.htm>.
American Association for the Advancement of Science. (2016, August 11). Gaming using a stretchy touchpad. ScienceDaily. Retrieved May 24, 2017 from www.sciencedaily.com/releases/2016/08/160811143224.htm
American Association for the Advancement of Science. "Gaming using a stretchy touchpad." ScienceDaily. www.sciencedaily.com/releases/2016/08/160811143224.htm (accessed May 24, 2017).

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