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 fingerpad. 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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