Journal
IEEE TRANSACTIONS ON HAPTICS
Volume 5, Issue 2, Pages 184-188Publisher
IEEE COMPUTER SOC
DOI: 10.1109/ToH.2011.39
Keywords
Electrotactile display; impedance feedback; pulse width modulation; real-time feedback; two point discrimination
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An electrotactile display is a tactile interface composed of skin surface electrodes. The use of such a device is limited by the variability of the elicited sensation. One possible solution to this problem is to monitor skin electrical impedance. Previous studies revealed a correlation between impedance and threshold, but did not construct real-time feedback loops. In this study, an electrotactile display was constructed using a 1.45 mu s feedback loop. Real-time pulse width modulation was proposed, and the relationship between skin resistance and absolute threshold was measured to find a function for determining a suitable pulse width from skin resistance. An evaluation experiment revealed that the proposed algorithm suppressed spatial variation and reduced temporal change.
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