EdgeVib: Effective Alphanumeric Character Output Using a Wrist-Worn Tactile Display
summary
EdgeVib builds a wrist-back tactile alphabet using a 2×2 vibrotactile array and multistroke EdgeVib patterns converted from EdgeWrite; a prototype vibrates sequences of points (≈500 ms per pulse, about three seconds per character) and uses a short corner vibration as a delimiter. A 24-participant study finds the low-resolution 2×2 layout outperforms 3×3, with 85.9% letters / 88.6% digits recognition for modified multistroke patterns versus 70.7%/78.5% for unistroke, and two-character messages >83.3%. Design rules favor splitting patterns into a three-vibration "recognizable lens"; limitations include diagonal/vertical confusions and likely drops in noisy, multitask settings.
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