Wearable lip-based electrotactile display : feasibility study, modeling, and system design

[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI-COLUMBIA AT AUTHOR'S REQUEST.] For assisting visually impaired to effectively perceive critical spatial information through the sense of touch, we proposed a wearable lip-based electrotactile display. The miniaturized display is most effective with lip interface due to the excellent sensory characteristics of lips. Since lips have never been utilized for tactile display applications, two human- subject experiments (6M/2F) including threshold measurement and two-line separation rating, have been designed to investigate the electrotactile sensitivity and spatial discriminating abilities of lips. Experimental results indicate excellent sensory characteristics suitable for electrotactile applications. Finite Element Modeling is applied to study the Activating Function (AF) and the Current Density (CD) distribution within superficial lip tissue. This computational method could help reveal the working principles behind electro stimulation. Furthermore, simulation results of 5 proposed geometrical electrode designs demonstrate the optimization of the AF and the CD for more uniform distribution. Finally, LTSPICE is used to simulate the performance of a designed on-chip waveform generator at the schematic level. This functional building block will be integrated with a wireless communication module in the near future, which will extend the living space of the blind by offering promising features of high portability and wearability.

Name thesis:degree_name

Ph. D.

Level thesis:degree_level

Doctoral

Discipline thesis:degree_discipline

Electrical and computer engineering (MU)

Grantor dc:publisher

University of Missouri--Columbia

Year dc:date.issued

2007

Author dc:creator

• Liu, Wei, 1975-

Advisor dc:contributor.advisor

• Tang, Hui

Statement dc:rights

• Access to files is limited to the University of Missouri--Columbia with SSO login.

Language dc:language.iso

eng, English

DOI

https://doi.org/10.32469/10355/5971

OAI identifier oai:identifier

oai:mospace.umsystem.edu:10355/5971