This paper describes two evaluations of pin-density characteristics of vibratory tactile stimulation for display design. First, the two-point threshold of vibratory pin stimulation was measured in terms of the position within a fingerpad to optimize vibratory pin layout that is appropriate for high perception ratio with fewer number of pins. The two-point threshold exhibited quite different values depending on the point within the finger-pad. The spatial resolution was higher at the distal side than the proximal side. Second, an apparent movement was measured under two conditions—twelve stimulators with a 1.5-mm inter-pin distance and six stimulators with a 3.0-mm distance on the surface of a fingerpad. The result suggested that the 1.5-mm condition produced the sensation of apparent movement more intensely and clearly in a wider range of inter stimulus onset interval.
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