FingerFlux: Near-surface Haptic Feedback on Tabletops
- Oct 26, 2011: FingerFlux has been featured on engadget.
- Oct 25, 2011: FingerFlux has been featured on Hack a Day.
- Oct 18, 2011: Our demo won 3rd place in the category "Best demo" at UIST 2011 conference.
- Oct 16, 2011: We are presenting FingerFlux with a full paper and demo at the UIST 2011 conference.
What is FingerFlux?
FingerFlux is a haptic output technique that provides near-surface haptic feedback on interactive tabletops. It combines an electromagnetic display with a permanent magnet attached to the user's index finger. The display consists of an array of electromagnets whose polarization and strength can be controlled individually. As the magnetic fields reach well beyond the surface, we can employ the array to influence the magnet at the user's finger and, therefore, create a haptic sensation. Using the permanent magnet, users can feel the magnet fields the table produces.
Watch our video on YouTube.
- Haptic output channel: FingerFlux provides an additional haptic output channel when interacting with touch screens. For example, when a user unintentionally approaches an on-screen button that triggers a critical operation, FingerFlux can provide vibration feedback to warn the user. FingerFlux can also render simple shapes or street maps, which may help visually impaired users to operate touch screens.
- Guiding the user: FingerFlux can guide users across the tabletop by creating an attracting magnetic field in a desired direction while producing a repelling force in the opposite direction. Sample applications include teaching gestures, or helping users to find a certain location on the screen without looking.
- A-priori input correction: Users tend to drift away from controls when operating touch screens without looking. Attracting magnetic fields can realign the user's finger every time he pushes a button and, thereby, avoid drifting over time.
- Moderate physical constraints: By creating attracting electromagnetic fields in the area of an on-screen control and repelling fields around it, we can make sure that users do not easily move outside controls they operate. Snap-to-grid can be implemented by creating attracting fields beneath grid nodes.
Attaching a magnet to a finger might sound impractical. However, this can be worth the trouble if it, e.g., allows visually impaired users to interact with touch screens. Furthermore, future designs are straight-forward:
|on top of the finger||next to the finger||at the end of a stylus||one or multiple magnets
embedded into a glove
There is also a body modification community that implanted magnets to the finger to gain a sixth sense and to feel electromagnetic fields.
Our studies show that users can feel vibration patterns up to 35 mm above the table surface when using our prototype. They also provide evidence that FingerFlux reduces drifting when operating buttons in an eyes-free fashion.