In this paper, we propose a process on forming durable and flexible circuits directly on textile using transfer printing technology. This process allows electronic textiles to demonstrate stable performance in the presence of physical stress, and allows us to implement high resolution textile circuits, compatible with variety of commercially-off-the-shelf chips. Using our technology, a flexible, wearable, and durable textile wristwatch is developed.

We introduce a new hand gesture recognition interface, called virtual button. The virtual button utilizes patterns of the wrist shape. It can recognize a pinch motion and it can be used as a generic button event. Using the pinch motion is favorable in multi-touch based interactions or games because it can express picking, moving, and releasing (or putting) activities in a natural way. We use a small-sized IR optic sensor to get patterns of finger flexor tendons on wrist cause by moving fingers. These patterns are used to recognize finger/hand movements. Our method can also measure applied forces at the picking operation where using a vision-based approach may encounter difficulties. Finally, our experimental result shows that using the IR-optic sensor can be an effective solution to implement the virtual button. Our system also shows that it can recognize effectively various kinds of other hand motions such as a shaking of hands or bending of fingers.

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